TY - JOUR
T1 - Surface nanocrystallization of metallic alloys with different stacking fault energy induced by laser shock processing
AU - Lou, S.
AU - Li, Y.
AU - Zhou, L.
AU - Nie, X.
AU - He, G.
AU - He, W.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/8/15
Y1 - 2016/8/15
N2 - Laser shock processing as a novel surface treatment technology, induces compressive residual stresses generation and microstructural transformation. However, compressive residual stresses will be relaxed under fatigue related conditions or elevated temperature conditions. Thus, we focus on the microstructural transformation especially surface nanocrystallization after LSP process. In this paper, the two typical alloys of TC6 titanium alloy and AISI 304 stainless steel were taken to study the surface nanocrystallization process, and the surface microstructures were characterized by transmission electron microscope (TEM) and electron back scattered diffraction (EBSD). The experiment results showed that nanostructure was formed in the surface layer with adequate laser parameters. In addition, we found that the more shock impacts or larger laser energy injected, the higher grain refinement degree was generated. Finally, surface nanocrystallization mechanisms of the two metallic alloys and the effects of different stacking fault energy on surface nanocrystallization were discussed in detail.
AB - Laser shock processing as a novel surface treatment technology, induces compressive residual stresses generation and microstructural transformation. However, compressive residual stresses will be relaxed under fatigue related conditions or elevated temperature conditions. Thus, we focus on the microstructural transformation especially surface nanocrystallization after LSP process. In this paper, the two typical alloys of TC6 titanium alloy and AISI 304 stainless steel were taken to study the surface nanocrystallization process, and the surface microstructures were characterized by transmission electron microscope (TEM) and electron back scattered diffraction (EBSD). The experiment results showed that nanostructure was formed in the surface layer with adequate laser parameters. In addition, we found that the more shock impacts or larger laser energy injected, the higher grain refinement degree was generated. Finally, surface nanocrystallization mechanisms of the two metallic alloys and the effects of different stacking fault energy on surface nanocrystallization were discussed in detail.
KW - AISI 304 stainless steel
KW - Laser shock processing
KW - Stacking fault energy
KW - Surface nanocrystallization
KW - TC6 titanium alloy
KW - Ultrahigh strain-rate
UR - https://www.scopus.com/pages/publications/84998955317
U2 - 10.1016/j.matdes.2016.05.028
DO - 10.1016/j.matdes.2016.05.028
M3 - 文章
AN - SCOPUS:84998955317
SN - 0264-1275
VL - 104
SP - 320
EP - 326
JO - Materials and Design
JF - Materials and Design
ER -