Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy

In this experimental research, shot peening (SP) and vibro-peening (VP) processes were employed to modify the surface and sub-surface of a Ni-based superalloy Udimet®720Li. The effect of these treatments on the surface topography, microstructure evolution, and mechanical properties was investigated...

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Main Authors: Kumar, Dharmesh, Idapalapati, Sridhar, Wang, Wei, Child, Daniel J., Haubold, Thomas, Wong, Chow Cher
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/144788
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1447882021-02-09T09:20:37Z Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy Kumar, Dharmesh Idapalapati, Sridhar Wang, Wei Child, Daniel J. Haubold, Thomas Wong, Chow Cher School of Mechanical and Aerospace Engineering Advanced Remanufacturing and Technology Centre, A*STAR Engineering::Mechanical engineering Ni-based Superalloys Surface Treatments In this experimental research, shot peening (SP) and vibro-peening (VP) processes were employed to modify the surface and sub-surface of a Ni-based superalloy Udimet®720Li. The effect of these treatments on the surface topography, microstructure evolution, and mechanical properties was investigated using instrumented tests. The compressive residual stresses and plastic strain generated through surface treatment were characterized using X-ray diffraction (XRD). The depth of plastically strained region was estimated using a quantitative analysis of grain orientation spread (GOS) data from electron back-scattered diffraction (EBSD) technique. It was observed that the magnitude of compressive residual stresses induced by VP is relatively low compared to SP, but the converse is true for depth of influence (DOI) for the same peening intensity. After thermal exposure at 650 °C (∼0.4Tm) for 5 h, the relaxation of compressive residual stresses and plastic strain was less pronounced in vibro-peening when compared to shot peening representing an improved thermal stability of the former process. Furthermore, 5.24 GPa surface micro-hardness of the untreated sample (O) was increased by ∼30% and ∼25.2% following SP and VP respectively. This resultant micro-hardness enhancement is due to grain refinement, plastic strain effects, and the introduction of low angle grain boundaries (LAGBs). Finally, a positive correlation among microstructural features and mechanical properties was fitted from the experimental data. Accepted version 2020-11-24T07:08:56Z 2020-11-24T07:08:56Z 2019 Journal Article Kumar, D., Idapalapati, S., Wang, W., Child, D. J., Haubold, T., & Wong, C. C. (2019). Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy. Journal of Materials Processing Technology, 267, 215–229. doi:10.1016/j.jmatprotec.2018.12.007 0924-0136 https://hdl.handle.net/10356/144788 10.1016/j.jmatprotec.2018.12.007 267 215 229 en Journal of Materials Processing Technology © 2018 Elsevier B.V. All rights reserved. This paper was published in Journal of Materials Processing Technology and is made available with permission of Elsevier B.V. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Ni-based Superalloys
Surface Treatments
spellingShingle Engineering::Mechanical engineering
Ni-based Superalloys
Surface Treatments
Kumar, Dharmesh
Idapalapati, Sridhar
Wang, Wei
Child, Daniel J.
Haubold, Thomas
Wong, Chow Cher
Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
description In this experimental research, shot peening (SP) and vibro-peening (VP) processes were employed to modify the surface and sub-surface of a Ni-based superalloy Udimet®720Li. The effect of these treatments on the surface topography, microstructure evolution, and mechanical properties was investigated using instrumented tests. The compressive residual stresses and plastic strain generated through surface treatment were characterized using X-ray diffraction (XRD). The depth of plastically strained region was estimated using a quantitative analysis of grain orientation spread (GOS) data from electron back-scattered diffraction (EBSD) technique. It was observed that the magnitude of compressive residual stresses induced by VP is relatively low compared to SP, but the converse is true for depth of influence (DOI) for the same peening intensity. After thermal exposure at 650 °C (∼0.4Tm) for 5 h, the relaxation of compressive residual stresses and plastic strain was less pronounced in vibro-peening when compared to shot peening representing an improved thermal stability of the former process. Furthermore, 5.24 GPa surface micro-hardness of the untreated sample (O) was increased by ∼30% and ∼25.2% following SP and VP respectively. This resultant micro-hardness enhancement is due to grain refinement, plastic strain effects, and the introduction of low angle grain boundaries (LAGBs). Finally, a positive correlation among microstructural features and mechanical properties was fitted from the experimental data.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Kumar, Dharmesh
Idapalapati, Sridhar
Wang, Wei
Child, Daniel J.
Haubold, Thomas
Wong, Chow Cher
format Article
author Kumar, Dharmesh
Idapalapati, Sridhar
Wang, Wei
Child, Daniel J.
Haubold, Thomas
Wong, Chow Cher
author_sort Kumar, Dharmesh
title Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
title_short Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
title_full Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
title_fullStr Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
title_full_unstemmed Microstructure-mechanical property correlation in shot peened and vibro-peened Ni-based superalloy
title_sort microstructure-mechanical property correlation in shot peened and vibro-peened ni-based superalloy
publishDate 2020
url https://hdl.handle.net/10356/144788
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