liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
BETA
Peng, Ru Lin
Alternative names
Publications (10 of 180) Show all publications
Chen, Z., Peng, R. L., Zhou, J., M'Saoubi, R., Gustafsson, D. & Moverare, J. (2019). 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, 100(9-12), 2601-2615
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
Show others...
2019 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 100, no 9-12, p. 2601-2615Article in journal (Refereed) Published
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, 2019
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)000458310400032 ()2-s2.0-85055531180 (Scopus ID)
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-03-05Bibliographically approved
Zhang, P., Sadeghimeresht, E., Chen, S., Li, X.-H., Markocsan, N., Joshi, S., . . . Peng, R. L. (2019). Effects of Surface Finish on the Initial Oxidation of HVAF-sprayed NiCoCrAlY Coatings. Surface & Coatings Technology, 364, 43-56
Open this publication in new window or tab >>Effects of Surface Finish on the Initial Oxidation of HVAF-sprayed NiCoCrAlY Coatings
Show others...
2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Journal of Surface and Coatings Technology, ISSN 0257-8972, Vol. 364, p. 43-56Article in journal (Refereed) Published
Abstract [en]

Oxide scale formed on HVAF-sprayed NiCoCrAlY coatings and the effect of surface treatment were investigated by a multi-approach study combining photo-stimulated luminescence, microstructural observation and mass gain. The initial oxidationbehaviour of as-sprayed, polished and shot-peened coatings at 1000 °C is studied. Both polished and shot-peened coatings exhibited superior performance due to rapid formation of α-Al2O3 fully covering the coating and suppressing the growth of transient alumina, assisted by a high density of α-Al2O3 nuclei on surface treatment induced defects. Moreover, the fast development of a two-layer alumina scale consisting of an inward-grown inner α-Al2O3 layer and an outer layer transformed from outward-grown transient alumina resulted in a higher oxide growth rate of the as-sprayed coating.

Place, publisher, year, edition, pages
Elsevier: Elsevier, 2019
Keywords
Oxidation, Transient ot alpha transformation, Surface treatment, Polishing, Shot-peening, Photo-stimulated liminescence spectroscopy
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-154936 (URN)10.1016/j.surfcoat.2019.02.068 (DOI)2-s2.0-85062231529 (Scopus ID)
Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-14Bibliographically approved
Jonnalagadda, K. P., Mahade, S., Kramer, S., Zhang, P., Curry, N., Li, X.-H. & Peng, R. L. (2019). Failure of Multilayer Suspension Plasma Sprayed Thermal Barrier Coatings in the Presence of Na2SO4 and NaCl at 900 °C. Journal of thermal spray technology (Print), 28(1-2), 212-222
Open this publication in new window or tab >>Failure of Multilayer Suspension Plasma Sprayed Thermal Barrier Coatings in the Presence of Na2SO4 and NaCl at 900 °C
Show others...
2019 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 28, no 1-2, p. 212-222Article in journal (Refereed) Published
Abstract [en]

The current investigation focuses on understanding the influence of a columnar microstructure and a sealing layer on the corrosion behavior of suspension plasma sprayed thermal barrier coatings (TBCs). Two different TBC systems were studied in this work. First is a double layer made of a composite of gadolinium zirconate + yttria stabilized zirconia (YSZ) deposited on top of YSZ. Second is a triple layer made of dense gadolinium zirconate deposited on top of gadolinium zirconate + YSZ over YSZ. Cyclic corrosion tests were conducted between 25 and 900 °C with an exposure time of 8 h at 900 °C. 75 wt.% Na2SO4 + 25 wt.% NaCl were used as the corrosive salts at a concentration of 6 mg/cm2. Scanning electron microscopy analysis of the samples’ cross sections showed that severe bond coat degradation had taken place for both the TBC systems, and the extent of bond coat degradation was relatively higher in the triple-layer system. It is believed that the sealing layer in the triple-layer system reduced the number of infiltration channels for the molten salts which resulted in overflowing of the salts to the sample edges and caused damage to develop relatively more from the edge.

Keywords
columnar microstructure, composite of gadolinium zirconate and YSZ, hot corrosion, suspension plasma spray
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:liu:diva-154778 (URN)10.1007/s11666-018-0780-5 (DOI)000456599500019 ()2-s2.0-85055998259 (Scopus ID)
Funder
VINNOVA
Note

This article is an invited paper selected from presentations at the 2018 International Thermal Spray Conference, held May 7-10, 2018, in Orlando, Florida, USA, and has been expanded from the original presentation.

Available from: 2018-11-06 Created: 2019-02-26 Last updated: 2019-02-26
Jonnalagadda, K. P., Eriksson, R., Li, X.-H. & Peng, R. L. (2019). Fatigue life prediction of thermal barrier coatings using a simplified crack growth model. Journal of the European Ceramic Society, 39(5), 1869-1876
Open this publication in new window or tab >>Fatigue life prediction of thermal barrier coatings using a simplified crack growth model
2019 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 39, no 5, p. 1869-1876Article in journal (Refereed) Published
Abstract [en]

Models that can predict the life of thermal barrier coatings (TBCs) during thermal cycling fatigue (TCF) tests are highly desirable. The present work focuses on developing and validating a simplified model based on the relation between the energy release rate and the TCF cycles to failure. The model accounts for stresses due to thermal mismatch, influence of sintering, and the growth of TGO (alumina and other non-protective oxides). The experimental investigation of TBCs included; 1) TCF tests at maximum temperatures of 1050 °C, 1100 °C, 1150 °C and a minimum temperature of 100 °C with 1 h and 5 h (1100 °C) hold times. 2) Isothermal oxidation tests at 900, 1000 and 1100 °C for times up to 8000 h. The model was calibrated and validated with the experimental results. It has been shown that the model is able to predict the TCF life and effect of hold time with good accuracy.

Keywords
Thermal barrier coatings, Thermal cycling fatigue, Life prediction model, Energy release rate
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-154780 (URN)10.1016/j.jeurceramsoc.2018.12.046 (DOI)000459950700016 ()
Note

Funding agencies: Vinnova in Sweden

Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-03-20
Jonnalagadda, K. P., Eriksson, R., Li, X.-H. & Peng, R. L. (2019). Thermal barrier coatings: Life model development and validation. Surface & Coatings Technology, 362, 293-301
Open this publication in new window or tab >>Thermal barrier coatings: Life model development and validation
2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 362, p. 293-301Article in journal (Refereed) Published
Abstract [en]

The failure of thermal barrier coatings (TBCs) during thermal cyclic fatigue (TCF) tests depends mainly on the thermal mismatch between the coating and the substrate, the thermally grown oxides (TGO) at the top coat-bond coat interface, and the sintering of the top coat. Understanding the interplay between these factors is essential for developing a life model. The present work focuses on further development of a previously established fracture mechanics based life model and its validation by comparing with the experimental results. The life model makes use of a Paris' law type equation to estimate the cycles to failure based on micro-crack growth. The fitting parameters for the Paris' law were obtained from the experimentally measured crack lengths after the interruption of TCF tests at different cycles. An alternative approach to obtain the fitting parameters through video monitoring was also discussed. It is shown that regardless of the approach to obtain the fitting parameters, the life model in its current form is able to predict the TCF life at different temperatures with reasonable accuracy. However, at very high temperatures (1150 °C) the predictive capabilities of the model appeared to be poor.

Keywords
Thermal barrier coatings, Thermal cyclic fatigue, Life modeling, Life prediction
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-154779 (URN)10.1016/j.surfcoat.2019.01.117 (DOI)
Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-02-26
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
Show others...
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
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
Jonnalagadda, K. P., Yuan, K., Li, X.-H., Ji, X., Yu, Y. & Peng, R. L. (2018). Influence of Top Coat and Bond Coat Pre-Oxidation on the Corrosion Resistance of Thermal Barrier Coatings in the Presence of SO2. In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, 2018, VOL 6: . Paper presented at ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Lillestrøm, Oslo, Norway, June 11-15, 2018. AMER SOC MECHANICAL ENGINEERS, Article ID V006T24A018.
Open this publication in new window or tab >>Influence of Top Coat and Bond Coat Pre-Oxidation on the Corrosion Resistance of Thermal Barrier Coatings in the Presence of SO2
Show others...
2018 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, 2018, VOL 6, AMER SOC MECHANICAL ENGINEERS , 2018, article id V006T24A018Conference paper, Published paper (Refereed)
Abstract [en]

Thermal barrier coatings (TBCs) degradation due to corrosion is one of the commonly observed failure types in land-based gas turbines due to the usage of low grade fuels. Sulfur in its gaseous form, as SO2, can attack the TBC system and result in the degradation of both the coating and the turbine component. The present study aims to understand the difference in the corrosion induced damage caused by SO2 gas mixture in different coating architectures. Corrosion tests were conducted at 780 degrees C in a tube furnace for a period of 168h. The inlet test gas had a composition of 1SO(2)-0.1CO-20CO(2)-N-2 (bal.) in vol. %. The coating architectures consisted of 1) an overlay coating, 2) a single-side bond coat TBC, 3) an all-side bond coat TBC, 4) an all-side bond coat TBC subjected to pre-oxidation prior to the corrosion tests. The results from the corrosion tests showed that the damage was the most severe for the overlay followed by single-side bond coat TBC. Between the other two systems, the TBC subjected to pre-oxidation had relatively lower corrosion damage. The corrosion damage started from the edges for the overlay and single-side bond coat TBC and as well as through the penetration of the gas through the coating. For the coatings with bond coat on all sides, the edge damage appeared to be considerably reduced and the damage is predominantly through the gas infiltration.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS, 2018
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:liu:diva-154767 (URN)10.1115/GT2018-76412 (DOI)000456908700068 ()978-0-7918-5112-8 (ISBN)
Conference
ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Lillestrøm, Oslo, Norway, June 11-15, 2018
Note

Funding Agencies|Vinnova in Sweden

Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-03-07Bibliographically 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
Show others...
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
Organisations

Search in DiVA

Show all publications