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Peng, Ru Lin
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Publications (10 of 167) Show all publications
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, 2889-2899 p., 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
Keyword
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, 47-56 p.Article 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
Keyword
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)
Keyword
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: 2018-01-16
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, 2766-2773 p.Article 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: 2017-12-15Bibliographically 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
Zhang, P., Peng, R. L., Li, X.-H. & Johansson, S. (2017). Hot Corrosion Behavior of HVOF CoNiCrAlY(Hf) Coating on Ni-based Superalloys. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1). .
Open this publication in new window or tab >>Hot Corrosion Behavior of HVOF CoNiCrAlY(Hf) Coating on Ni-based Superalloys
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keyword
MCrAlY, Hot Corrosion, Reactive Element, Hafnium
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143974 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Zhang, P., Yuan, K., Peng, R. L., Li, X.-H. & Johansson, S. (2017). Long-Term Oxidation of MCrAlY coatings at 1000 C and an Al-activity Based Coating Life Criterion. Surface & Coatings Technology (332), 12-21.
Open this publication in new window or tab >>Long-Term Oxidation of MCrAlY coatings at 1000 C and an Al-activity Based Coating Life Criterion
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, no 332, 12-21 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
MCrAlY, Al-activity, a-Alumina, life criterion, long-term oxidation
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-142315 (URN)10.1016/j.surfcoat.2017.2017.09.086 (DOI)
Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2017-12-01
Deng, D., Moverare, J., Peng, R. L. & Söderberg, H. (2017). Microstructural Heterogeneity Along the Building Direction of Inconel 718 Produced by Electron Beam Melting (EBM). In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1). .
Open this publication in new window or tab >>Microstructural Heterogeneity Along the Building Direction of Inconel 718 Produced by Electron Beam Melting (EBM)
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143975 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Deng, D., Moverare, J., Peng, R. L. & Söderberg, H. (2017). Microstructure and Anisotropic Mechanical Properties of EBM Manufactued Inconel 718 and Effects of Post Heat Treatment. Materials Science & Engineering: A, 693, 151-163.
Open this publication in new window or tab >>Microstructure and Anisotropic Mechanical Properties of EBM Manufactued Inconel 718 and Effects of Post Heat Treatment
2017 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 693, 151-163 p.Article in journal (Refereed) Published
Abstract [en]

Materials manufactured with electron beam melting (EBM) have different microstructures and properties to those manufactured using conventional manufacturing methods. A detailed study of the microstructures and mechanical properties of Inconel 718 manufactured with EBM was performed in both as-manufactured and heat-treated conditions. Different scanning strategies resulted in different microstructures: contour scanning led to heterogeneous grain morphologies and weak texture, while hatch scanning resulted in predominantly columnar grains and strong 〈001〉 building direction texture. Precipitates in the as-manufactured condition included γ′, γ″, δ  , TiN and NbC, among which considerable amounts of γ″ yielded relatively high hardness and strength. Strong texture, directionally aligned pores and columnar grains can lead to anisotropic mechanical properties when loaded in different directions. Heat treatments increased the strength and led to different δ precipitation behaviours depending on the solution temperatures, but did not remove the anisotropy. Ductility seemed to be not significantly affected by heat treatment, but instead by the NbC and defects inherited from manufacturing. The study thereby might provide the potential processing windows to tailor the microstructure and mechanical properties of EBM IN718.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
Electron beam melting; Nickel based superalloy; Microstructure; Anisotropy; Mechanical properties; Heat treatments
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-137289 (URN)10.1016/j.msea.2017.03.085 (DOI)000401384400018 ()2-s2.0-85016252903 (Scopus ID)
Note

Funding agencies: Sandvik Machining Solutions AB in Sandviken, Sweden; Faculty Grant SFO-MAT-LiU at Linkoping University [2009-00971]; Chinese Scholarship Council; Agora Materiae

Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2017-06-13Bibliographically approved
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