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Peng, Ru Lin
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Publications (10 of 175) Show all publications
Peng, R. L., Selegård, L., Jonsson, M., Ess, M. & Petersén, G. (2018). Effect of Dengeling on Bending Fatigue Behaviour of Al Alloy 7050 and Comparison with Milling and Shot Peening. In: Materials Research Forum LLC (Ed.), Materials Research Proceedings 6 (2018): . Paper presented at ECRS-10 European Conference on Residual Stresses 2018, Leuven, Belgium, 9-14 September 2018 (pp. 203-208). MATERIALS RESEARCH FORUM, 6
Open this publication in new window or tab >>Effect of Dengeling on Bending Fatigue Behaviour of Al Alloy 7050 and Comparison with Milling and Shot Peening
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2018 (English)In: Materials Research Proceedings 6 (2018) / [ed] Materials Research Forum LLC, MATERIALS RESEARCH FORUM , 2018, Vol. 6, p. 203-208Conference paper, Published paper (Refereed)
Abstract [en]

Dengeling is a new surface mechanical treatment developed as an alternative to the shot peening method used for enhancing the fatigue resistance of metallic materials. In this work, Dengeling is compared with milling and shot peening with regard to the ef

Place, publisher, year, edition, pages
MATERIALS RESEARCH FORUM, 2018
Keywords
Dengelig, shot peening, milling, bending fatigue, Al alloy
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-151403 (URN)10.21741/9781945291890-32 (DOI)000451793600032 ()
Conference
ECRS-10 European Conference on Residual Stresses 2018, Leuven, Belgium, 9-14 September 2018
Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-12-20
Chen, Z., Peng, R. L., Zhou, J., M'Saoubi, R., Gustafsson, D. & Moverare, J. (2018). Effect of Machining Parameters on Cutting Force and Surface Integrity when High-Speed Turning AD730™ with PCBN Tools. The International Journal of Advanced Manufacturing Technology
Open this publication in new window or tab >>Effect of Machining Parameters on Cutting Force and Surface Integrity when High-Speed Turning AD730™ with PCBN Tools
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2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015Article in journal (Refereed) Epub ahead of print
Abstract [en]

The novel wrought nickel-based superalloy, AD 730™, is a good candidate material for turbine disc applications at high temperatures beyond 650 °C. The present study focuses on the machining performance of this newly developed alloy under high-speed turning conditions with advanced PCBN tools. Meanwhile, the machined surface integrity as influenced by cutting speed and feed rate was also investigated. The surface integrity was thoroughly characterized in terms of surface roughness and morphology, machining-induced plastic deformation, white layer formation, and residual stresses. It has been found that the cutting speed and feed rate had a strong effect on the cutting forces and resultant surface integrity. The cutting forces required when machining the alloy were gradually reduced with increasing cutting speed, while at 250 m/min and above, the flank tool wear became stronger which led to increased thrust force and feed force. A higher feed rate, on the other hand, always resulted in higher cutting forces. Increasing the cutting speed and feed rate in general deteriorated the surface integrity. High cutting speeds within the range of 200–250 m/min and a low feed rate of 0.1 mm/rev are preferable in order to implement more cost-effective machining without largely reducing the surface quality achieved. The formation of tensile residual stresses on the machined AD 730™, however, could be of a concern where good fatigue resistance is critical.

Place, publisher, year, edition, pages
Springer London, 2018
Keywords
Nickel-based superalloy, High-speed turning, Cutting forces, Surface integrity, AD730, Cubic boron nitride (CBN) tool
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-153292 (URN)10.1007/s00170-018-2792-1 (DOI)2-s2.0-85055531180 (Scopus ID)
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-18Bibliographically approved
Zhou, N., Pettersson, R., Schönning, M. & Peng, R. L. (2018). Influence of Surface Grinding on Corrosion Behaviour of Ferritic Stainless Steels in Boiling Magnesium Chloride Solution. Materials and corrosion - Werkstoffe und Korrosion, 69(11), 1560-1571
Open this publication in new window or tab >>Influence of Surface Grinding on Corrosion Behaviour of Ferritic Stainless Steels in Boiling Magnesium Chloride Solution
2018 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 69, no 11, p. 1560-1571Article in journal (Refereed) Published
Abstract [en]

The influence of grinding operations on surface properties and corrosion behavior of a ferritic stainless steel (FSS), EN 1.4509, has been investigated and limited comparisons also made to the grade EN 1.4622. Surface grinding was performed along the rolling direction of the material. Corrosion tests were conducted in boiling magnesium chloride solution according to ASTM G36; specimens were exposed both without external loading and under four‐point bend loading. The surface topography and cross‐section microstructure before and after exposure were investigated, and residual stresses were measured on selected specimens before and after corrosion tests using X‐ray diffraction. In addition, in situ surface stress measurements were performed to evaluate the actual surface stresses of specimens subject to four‐point bend loading according to ASTM G39. Micro‐pits showing branched morphology initiated from the highly deformed ground surface layer which contained fragmented grains, were observed for all the ground specimens but not those in the as‐delivered condition. Grain boundaries under the surface layer appeared to hinder the corrosion process. No macro‐cracking was found on any specimen after exposure even at high calculated applied loads.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018
Keywords
ferritic stainless steel, grinding, microstructure, pitting, residual stress, stress corrosion cracking
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-152881 (URN)10.1002/maco.201810206 (DOI)000451781100006 ()2-s2.0-85055888824 (Scopus ID)
Note

Funding agencies: Outokumpu Stainless Research Foundation; Avesta Research Center, Region Dalarna; Region Gavleborg; Lansstyrelsen Gavleborg; Hogskolan Dalarna; Sandviken Kommun; Jernkontoret

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-12-20Bibliographically approved
Zhang, P., Peng, R. L., Li, X.-H. & Johansson, S. (2018). Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings. Coatings, 8(4), 129-145
Open this publication in new window or tab >>Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings
2018 (English)In: Coatings, ISSN 2079-6412, Vol. 8, no 4, p. 129-145Article in journal (Refereed) Published
Abstract [sv]

MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited on an Inconel-792 substrate using high velocity oxygen fuel (HVOF). The samples were subjected to isothermal oxidation tests in laboratory air at 900, 1000, and 1100 °C and a cyclic oxidation test between 100 and 1100 °C with a 1-h dwell time at 1100 °C. It was observed that the coating with Ce showed a much higher oxidation rate than the coating with Y + Ru under both isothermal and cyclic oxidation tests. In addition, the Y + Ru-doped coating showed significantly lower β phase depletion due to interdiffusion between the coating and the substrate, resulting from the addition of Ru. Simulation results using a moving phase boundary model and an established oxidation-diffusion model showed that Ru stabilized β grains, which reduced β-depletion of the coating due to substrate interdiffusion. This paper, combining experiment and simulation results, presents a comprehensive study of the influence of Ce and Ru on oxidation behavior, including an investigation of the microstructure evolution in the coating surface and the coating-substrate interface influenced by oxidation time.

Place, publisher, year, edition, pages
M D P I AG, 2018
Keywords
MCrAlX coatings, Ruthenium, Cerium, Oxidation, Simulation
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-148278 (URN)10.3390/coatings8040129 (DOI)000434378700004 ()
Note

Funding agencies: Carl Tryggers Stifelsen [CTS16:207]; Swedish Research Council [VR-2014-3079]; Erling-Persson Family Foundation [2017-10-09]; Promobilia Foundation [F17603]

Available from: 2018-06-05 Created: 2018-06-05 Last updated: 2018-06-28Bibliographically approved
Sadeghimeresht, E., Karimi, P., Zhang, P., Peng, R. L., Andersson, J., Pejryd, L. & Joshi, S. (2018). Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718. In: The Minerals, Metals & Society 2018. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace and Industrial Applications: . Paper presented at 2018 Superalloy 718 & Derivatives: Energy, Aerospace and Industrial Applications, June 3-6, 2018, Pittsburg, USA (pp. 219-240).
Open this publication in new window or tab >>Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718
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2018 (English)In: The Minerals, Metals & Society 2018. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace and Industrial Applications, 2018, p. 219-240Conference paper, Published paper (Refereed)
Keywords
Additive manufacturing, Electron beam melting, Alloy 718, Oxidation behavior, Grain texture
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-153300 (URN)10.1007/978-3-319-89480-5_13 (DOI)
Conference
2018 Superalloy 718 & Derivatives: Energy, Aerospace and Industrial Applications, June 3-6, 2018, Pittsburg, USA
Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11
Krakhamalev, P., Fredriksson, G., Svensson, K., Yadroitsev, I., Yadroitseva, I., Thuvander, M. & Peng, R. L. (2018). Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion. Metals, 8(8), 643-660
Open this publication in new window or tab >>Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 8, p. 643-660Article, review/survey (Refereed) Published
Abstract [en]

This article overviews the scientific results of the microstructural features observed in 316 L stainless steel manufactured by the laser powder bed fusion (LPBF) method obtained by the authors, and discusses the results with respect to the recently published literature. Microscopic features of the LPBF microstructure, i.e., epitaxial nucleation, cellular structure, microsegregation, porosity, competitive colony growth, and solidification texture, were experimentally studied by scanning and transmission electron microscopy, diffraction methods, and atom probe tomography. The influence of laser power and laser scanning speed on the microstructure was discussed in the perspective of governing the microstructure by controlling the process parameters. It was shown that the three-dimensional (3D) zig-zag solidification texture observed in the LPBF 316 L was related to the laser scanning strategy. The thermal stability of the microstructure was investigated under isothermal annealing conditions. It was shown that the cells formed at solidification started to disappear at about 800 °C, and that this process leads to a substantial decrease in hardness. Colony boundaries, nevertheless, were quite stable, and no significant grain growth was observed after heat treatment at 1050 °C. The observed experimental results are discussed with respect to the fundamental knowledge of the solidification processes, and compared with the existing literature data. 

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
316 L stainless steel; laser powder bed fusion, cellular solidification; solidification texture; electron microscopy, themal stability of microstructure
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-151057 (URN)10.3390/met8080643 (DOI)000443616400079 ()2-s2.0-85052594962 (Scopus ID)
Note

Funding agencies: South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa [97994]; Collaborative Program in Additive Manufacturing, Region Varmland, Karlstad University [CSIR-NLC-CPAM-15-MOA-CUT-

Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2018-10-04Bibliographically approved
Chen, Z., Zhou, J., Peng, R. L., M'Saoubi, R., Gustafsson, D., Palmert, F. & Moverare, J. (2018). Plastic Deformation and Residual Stress in High Speed Turning of AD730™ Nickel-based Superalloy with PCBN and WC Tools. In: Procedia CIRP 71 (2018) pp 440-445: . Paper presented at The 4th CIRP Conference on Surface Integrity, 11th-13th July, Tianjin, China (pp. 440-445). Elsevier, 71
Open this publication in new window or tab >>Plastic Deformation and Residual Stress in High Speed Turning of AD730™ Nickel-based Superalloy with PCBN and WC Tools
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2018 (English)In: Procedia CIRP 71 (2018) pp 440-445, Elsevier, 2018, Vol. 71, p. 440-445Conference paper, Published paper (Refereed)
Abstract [en]

A higher gas turbine efficiency can be achieved by increasing the operating temperature in hot sections. AD730™ is a recently-developed wrought/cast nickel-based superalloy which can maintain excellent mechanical properties above 700 ℃. However, machining of AD730™ could be a difficult task like other nickel-based superalloys. Therefore, studies are needed with respect to the machinability of this new alloy.

In this paper, high-speed turning was performed on AD730™ using polycrystalline cubic boron nitride (PCBN) tools and coated tungsten carbide (WC) tools at varied cutting speeds. The surface integrity was assessed in two important aspects, i.e., surface and sub-surface plastic deformation and residual stresses. The PCBN tools generally showed better performance compared with the WC tools since it led to reduced machining time without largely compromising the surface integrity achieved. The optimal cutting speed was identified in the range of 200-250 m/min when using the PCBN tools, which gives rise to a good combination of machining efficiency and surface integrity. The further increase of the cutting speed to 300 m/min resulted in severe and deep plastic deformation. Meanwhile, a continuous white layer was formed at the machined surface. When turning with the WC tools, the increased cutting speed from 80 m/min to 100 m/min showed very little effect with respect to the plastic deformation on the machined surface. It was found that tensile residual stresses were developed on all machined surfaces no matter when the PCBN or WC tools were used, and the surface tension was generally increased with increasing cutting speed. The tensile layer might need to be modified by e.g., post-machining surface treatments such as shot peening, if taking good fatigue performance into consideration.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
plastic deformation, residual stress, nickel-based superalloy, AD730TM, high-speed turning
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-148484 (URN)10.1016/j.procir.2018.05.051 (DOI)
Conference
The 4th CIRP Conference on Surface Integrity, 11th-13th July, Tianjin, China
Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2018-07-03
Zhou, J., Persson, H., Chen, Z., M'Saoubi, R., Gustafsson, D., Bushlya, V., . . . Peng, R. L. (2018). Surface Characterization of AD730™ Part Produced in High Speed Turning with CBN Tool. In: Elsevier (Ed.), Procedia CIRP 71 (2018): . Paper presented at 4th CIRP Conference on Surface Integrity (CSI 2018) (pp. 215-220). , 71
Open this publication in new window or tab >>Surface Characterization of AD730™ Part Produced in High Speed Turning with CBN Tool
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2018 (English)In: Procedia CIRP 71 (2018) / [ed] Elsevier, 2018, Vol. 71, p. 215-220Conference paper, Published paper (Refereed)
Keywords
AD730, Superalloy, Surface integrity, CBN, High Speed Machining
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-153290 (URN)10.1016/j.procir.2018.05.068 (DOI)
Conference
4th CIRP Conference on Surface Integrity (CSI 2018)
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-10
Jonnalagadda, K. P., Eriksson, R., Yuan, K., Li, X.-H., Ji, X., Yu, Y. & Peng, R. L. (2017). A Study of Damage Evolution in High Purity Nano TBCs During Thermal Cycling: A Fracture Mechanics Based modeling approach.. In: ASME Turbine Expo: . Paper presented at ASME Turbine Expo 2017, June 25-29, 2017, North Carolina, USA (pp. 2889-2899). Elsevier, 37, Article ID 8.
Open this publication in new window or tab >>A Study of Damage Evolution in High Purity Nano TBCs During Thermal Cycling: A Fracture Mechanics Based modeling approach.
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2017 (English)In: ASME Turbine Expo, Elsevier, 2017, Vol. 37, p. 2889-2899, article id 8Conference paper, Published paper (Refereed)
Abstract [en]

This work concerns the study of damage evolution in a newly developed high purity nano 8YSZ thermal barrier coating during thermal cyclic fatigue tests (TCF). TCF tests were conducted between 100 °C–1100 °C with a hold time of 1 h at 1100 °C, first till failure and later for interrupted tests. Cross section analysis along the diameter of the interrupted test samples revealed a mixed-type failure and that the most of the damage occurred towards the end of the coating’s life. To understand the most likely crack growth mechanism leading to failure, different crack growth paths have been modelled using finite element analysis. Crack growing from an existing defect in the top coat towards the top coat/TGO interface has been identified as the most likely mechanism. Estimated damage by the model could predict the rapid increase in the damage towards the end of the coating’s life.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Thermal cyclic fatigue, High purity nano YSZ, Crack growth modelling, Damage evolution
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-142310 (URN)10.1016/j.jeurceramsoc.2017.02.054 (DOI)2-s2.0-85014154522 (Scopus ID)
Conference
ASME Turbine Expo 2017, June 25-29, 2017, North Carolina, USA
Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2017-11-21Bibliographically approved
Jonnalagadda, K. P., Eriksson, R., Yuan, K., Li, X.-H., Ji, X., Yu, Y. & Peng, R. L. (2017). Comparison of Damage Evolution During Thermal Cycling in a High Purity Nano and Conventional Thermal Barrier Coating. Surface & Coatings Technology, 332, 47-56
Open this publication in new window or tab >>Comparison of Damage Evolution During Thermal Cycling in a High Purity Nano and Conventional Thermal Barrier Coating
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 332, p. 47-56Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBCs), consisting of a ceramic top coat and a metallic bond coat, offer resistance against high temperature degradation of turbine components. Cyclic oxidation of the bond coat, thermal stresses due to their thermal mismatches during cyclic operations, and sintering of the top coat are considered to be the common ways by which thermal barrier coatings fail. To reduce sintering, a nano structured high purity yttria stabilized zirconia (YSZ) was developed. The focus of this work is to compare the damage development of such high purity nano YSZ TBC during thermal cycling with a conventional YSZ TBC. Thermal cyclic fatigue (TCF) tests were conducted on both the TBC systems between 100 °C and 1100 °C with a 1 h hold time at 1100 °C. TCF test results showed that conventional YSZ TBC exhibited much higher life compared to the high purity nano YSZ TBC. The difference in the lifetime is explained by the use of microstructural investigations, crack length measurements along the cross-section and the difference in the elastic modulus. Furthermore, stress intensity factors were calculated in order to understand the difference(s) in the damage development between the two TBC systems.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
High purity nano, damage evolution, thermal cycling fatigue, crack length measurement, conventional TBC
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-142311 (URN)10.1016/j.surfcoat.2017.09.069 (DOI)000418968100007 ()2-s2.0-85030751243 (Scopus ID)
Note

Funding agencies: Vinnova in Sweden [2015-06870]

Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2018-01-12Bibliographically approved
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