Characteristic of Warm Laser Shock Peening of ЭП866 Heat Resistant Martensite Stainless Steel

doi:10.11901/1005.3093.2016.561

Chinese Journal of Materials Research

2017, Vol. 31

Issue (11): 827-832 DOI: 10.11901/1005.3093.2016.561

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Characteristic of Warm Laser Shock Peening of ЭП866 Heat Resistant Martensite Stainless Steel

Qinglai ZHANG¹, Yuanyuan HE¹, Bingxin ZHANG²

1 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.
2 University of Michigan-Shanghai Jiao Tong University, Shanghai 200240, China.

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Qinglai ZHANG, Yuanyuan HE, Bingxin ZHANG. Characteristic of Warm Laser Shock Peening of ЭП866 Heat Resistant Martensite Stainless Steel. Chinese Journal of Materials Research, 2017, 31(11): 827-832.

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Abstract

The warm laser shock peening (WLSP) of heat resistant martensite stainless steel ЭП866 was carried out by Nd glass pulse laser, and the microstructure and properties of the impacted layer were assessed by transmission electron microscopy and X-ray stress analyzer. The results show that WLSP has obvious strengthening effect compared to LSP at room temperature. Through dynamic strain aging (DSA) and dynamic precipitation (DP), the WLSP generates higher compressive residual stress, higher density dislocation structures and nano-scale precipitates on the impacted layer of the treated steel ЭП866.

Key words: metallic materials, ЭП866 stainless steel WLSP compressive residual stress surface hardness DSA

Received: 26 September 2016

Fund: Supported by National Natural Science Foundation of China (No. 51175231)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.561 OR https://www.cjmr.org/EN/Y2017/V31/I11/827

Table 1 Chemical composition of ЭП866 stainless steel (mass fraction, %)

Fig.1 Diagram of optical path and fixture for WLSP

Fig.2 ЭП866 stainless steel after heat treatment (a) OM, (b) SEM

Fig.3 TEM images of ЭП866 stainless steel after heat treatment (a) martensite laths, (b) continuous precipitates

Fig.4 TEM images of ЭП866 stainless steel by LSP (a) martensitelaths, (b) tangled dislocation, (c, d) strip precipitattes

Fig.5 TEM images of ЭП866stainless steel by WLSP (a) martensitelaths, (b) tangled dislocation, (c) strip precipitates, (d) globular precipitates

Table 2 Surface residual stresses of ЭП866 stainless steel at single shock zone (MPa)

Table 3 Surface micro-hardness (HV) of ЭП866 stainless steel at single shock zone

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