Effect of Laser Shock Peening (LSP) on the Microstructure, Residual Stress State and Hardness of a Nickel based Superalloy

Research output: Contribution to conferenceAbstract

Abstract

Efforts have been made here to understand the effect of laser shock peening (LSP) on the phase, microstructure, residual stress and hardness of a nickel (Ni) based superalloy. A 10 J Nd:YAG laser was used for the LSP operation. Following LSP detailed microstructural, surface topography, phase and compositional analyses, along with residual stress and hardness studies were undertaken. A parametric window was first established to explore the relationship between LSP process parameters and the respective surface and bulk properties. The effects of an ablative medium on the properties of the modified layer was also investigated. Qualitative and quantitative information on dislocation density was obtained using X-ray diffraction (XRD) analysis and correlated with the processing parameters. Residual stress developed following LSP was measured using the XRD technique. Nanocrystallization of the Ni matrix was observed following LSP under optimized laser operating parameters. An increase in the hardness of the Ni based superalloy was observed due to the microstructural refinement. The residual stress state on the surface of the laser shock peened Ni based superalloy showed a maximum compressive stress of 166 MPa, which gradually decreased with depth from the surface. A detailed microstructure-property relationship was established to understand the mechanism of property enhancement. Further optimization of the LSP process to surface treat the Ni-based superalloy will open up new avenues for the material’s applicability, particularly in the aerospace sector.
Original languageEnglish
Publication statusPublished - 2017
EventIndustrial Laser Applications Symposium - Belton Woods, Grantham, United Kingdom
Duration: 22 Mar 201723 Mar 2017
Conference number: 5
http://ilas2017.co.uk/ (Link to conference website)

Conference

ConferenceIndustrial Laser Applications Symposium
Abbreviated titleILAS 2017
CountryUnited Kingdom
CityGrantham
Period22/03/1723/03/17
Internet address

Fingerprint

peening
heat resistant alloys
residual stress
hardness
shock
nickel
microstructure
lasers
diffraction
surface properties
YAG lasers
topography
x rays
sectors

Cite this

Effect of Laser Shock Peening (LSP) on the Microstructure, Residual Stress State and Hardness of a Nickel based Superalloy. / Nath, Subhasisa; Shukla, Pratik; Shen, Xiaojun; Lawrence, Jonathan.

2017. Abstract from Industrial Laser Applications Symposium, Grantham, United Kingdom.

Research output: Contribution to conferenceAbstract

Nath, S, Shukla, P, Shen, X & Lawrence, J 2017, 'Effect of Laser Shock Peening (LSP) on the Microstructure, Residual Stress State and Hardness of a Nickel based Superalloy' Industrial Laser Applications Symposium, Grantham, United Kingdom, 22/03/17 - 23/03/17, .
@conference{6091452aa6a34c1585db97e5d8abbf58,
title = "Effect of Laser Shock Peening (LSP) on the Microstructure, Residual Stress State and Hardness of a Nickel based Superalloy",
abstract = "Efforts have been made here to understand the effect of laser shock peening (LSP) on the phase, microstructure, residual stress and hardness of a nickel (Ni) based superalloy. A 10 J Nd:YAG laser was used for the LSP operation. Following LSP detailed microstructural, surface topography, phase and compositional analyses, along with residual stress and hardness studies were undertaken. A parametric window was first established to explore the relationship between LSP process parameters and the respective surface and bulk properties. The effects of an ablative medium on the properties of the modified layer was also investigated. Qualitative and quantitative information on dislocation density was obtained using X-ray diffraction (XRD) analysis and correlated with the processing parameters. Residual stress developed following LSP was measured using the XRD technique. Nanocrystallization of the Ni matrix was observed following LSP under optimized laser operating parameters. An increase in the hardness of the Ni based superalloy was observed due to the microstructural refinement. The residual stress state on the surface of the laser shock peened Ni based superalloy showed a maximum compressive stress of 166 MPa, which gradually decreased with depth from the surface. A detailed microstructure-property relationship was established to understand the mechanism of property enhancement. Further optimization of the LSP process to surface treat the Ni-based superalloy will open up new avenues for the material’s applicability, particularly in the aerospace sector.",
author = "Subhasisa Nath and Pratik Shukla and Xiaojun Shen and Jonathan Lawrence",
year = "2017",
language = "English",
note = "Industrial Laser Applications Symposium, ILAS 2017 ; Conference date: 22-03-2017 Through 23-03-2017",
url = "http://ilas2017.co.uk/",

}

TY - CONF

T1 - Effect of Laser Shock Peening (LSP) on the Microstructure, Residual Stress State and Hardness of a Nickel based Superalloy

AU - Nath, Subhasisa

AU - Shukla, Pratik

AU - Shen, Xiaojun

AU - Lawrence, Jonathan

PY - 2017

Y1 - 2017

N2 - Efforts have been made here to understand the effect of laser shock peening (LSP) on the phase, microstructure, residual stress and hardness of a nickel (Ni) based superalloy. A 10 J Nd:YAG laser was used for the LSP operation. Following LSP detailed microstructural, surface topography, phase and compositional analyses, along with residual stress and hardness studies were undertaken. A parametric window was first established to explore the relationship between LSP process parameters and the respective surface and bulk properties. The effects of an ablative medium on the properties of the modified layer was also investigated. Qualitative and quantitative information on dislocation density was obtained using X-ray diffraction (XRD) analysis and correlated with the processing parameters. Residual stress developed following LSP was measured using the XRD technique. Nanocrystallization of the Ni matrix was observed following LSP under optimized laser operating parameters. An increase in the hardness of the Ni based superalloy was observed due to the microstructural refinement. The residual stress state on the surface of the laser shock peened Ni based superalloy showed a maximum compressive stress of 166 MPa, which gradually decreased with depth from the surface. A detailed microstructure-property relationship was established to understand the mechanism of property enhancement. Further optimization of the LSP process to surface treat the Ni-based superalloy will open up new avenues for the material’s applicability, particularly in the aerospace sector.

AB - Efforts have been made here to understand the effect of laser shock peening (LSP) on the phase, microstructure, residual stress and hardness of a nickel (Ni) based superalloy. A 10 J Nd:YAG laser was used for the LSP operation. Following LSP detailed microstructural, surface topography, phase and compositional analyses, along with residual stress and hardness studies were undertaken. A parametric window was first established to explore the relationship between LSP process parameters and the respective surface and bulk properties. The effects of an ablative medium on the properties of the modified layer was also investigated. Qualitative and quantitative information on dislocation density was obtained using X-ray diffraction (XRD) analysis and correlated with the processing parameters. Residual stress developed following LSP was measured using the XRD technique. Nanocrystallization of the Ni matrix was observed following LSP under optimized laser operating parameters. An increase in the hardness of the Ni based superalloy was observed due to the microstructural refinement. The residual stress state on the surface of the laser shock peened Ni based superalloy showed a maximum compressive stress of 166 MPa, which gradually decreased with depth from the surface. A detailed microstructure-property relationship was established to understand the mechanism of property enhancement. Further optimization of the LSP process to surface treat the Ni-based superalloy will open up new avenues for the material’s applicability, particularly in the aerospace sector.

M3 - Abstract

ER -