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Peng, Ru Lin
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Publications (10 of 171) 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). , 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, 2018, Vol. 6, p. 203-208Conference paper, Published paper (Refereed)
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)
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: 2018-09-19
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
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
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
Jonnalagadda, K. P., Li, X.-H. & Peng, R. L. (2017). Corrosion Mechanism in Thermal Barrier Coatings During Exposure to a Gas Mixture of N2-CO-CO2-SO2. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Corrosion Mechanism in Thermal Barrier Coatings During Exposure to a Gas Mixture of N2-CO-CO2-SO2
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keywords
high temperature corrosion, mixed gas corrosion, thermal barrier coatings, Amdry 964
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143977 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Chen, Z., Peng, R. L., Zhou, J., Bushlya, V., Saoubi, R. M., Johansson, S. & Moverare, J. (2017). Effect of Cutting Conditions on Machinability of AD 730 TM during High Speed Turning with PCBN Tools. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Effect of Cutting Conditions on Machinability of AD 730 TM during High Speed Turning with PCBN Tools
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143973 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-08-02Bibliographically approved
Lundberg, M., Saarimäki, J., Moverare, J. & Peng, R. L. (2017). Effective X-ray Elastic Constant of Cast Iron. Journal of Materials Science, 53(4), 2766-2773
Open this publication in new window or tab >>Effective X-ray Elastic Constant of Cast Iron
2017 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 4, p. 2766-2773Article in journal (Refereed) Published
Abstract [en]

X-ray diffraction is a non-destructive method used for strain measurements in crystalline materials. Conversion of strain to stress can be achieved using the X-ray elastic constants (XEC), s1 and ½s2. The sin2ψ method was used during in situ loading to determine XEC for flake, vermicular, and spherical graphite iron. A fully pearlitic steel was used as reference. Uniaxial testing was conducted on the cast iron to create a homogeneous strain field, as well as four-point bending in both tension and compression due to the tension/compression asymmetry. The commonly used XEC value ½s2 = 5.81 × 10−6 MPa−1 is theoretically derived from an α-Fe single crystal. When investigating materials that contain ferrite, such as polycrystalline cast iron, this value is not accurate. Determination of an effective XEC for polycrystalline cast iron yields a better correlation between the measured microstrains and the properties observed on a macroscopic scale. The need for an effective XEC is evident, especially when it comes to model validation of, for example, casting simulations. Effective XEC values have been determined for flake, vermicular, and spherical graphite iron. The determined value is lower than the theoretical value.

National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-141980 (URN)10.1007/s10853-017-1657-6 (DOI)000416544500040 ()2-s2.0-85031402118 (Scopus ID)
Note

Funding agencies: Agora Materiae, graduate school, the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; Volvo Trucks; Vinnova FFI, Scania

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2018-08-30Bibliographically approved
Peng, R. L., Jonsson, M., Selegård, L., Ess, M. & Petersén, G. (2017). Fatigue of Dengeling Treated Al-Alloys. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Fatigue of Dengeling Treated Al-Alloys
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143976 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
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