Grain coarsening of nano laminated structure in martensite steel under sliding wear

被引:12
作者
Gao, Qing-Yuan [1 ]
Li, Shu-Xin [1 ,2 ]
Su, Yun-Shuai [1 ]
Cao, Jun [1 ]
Moliar, Oleksandr [1 ,3 ]
机构
[1] Ningbo Univ, Sch Mech Engn & Mech, Ningbo 315211, Peoples R China
[2] Ningbo Univ, Key Lab Part Rolling Zhejiang Prov, Ningbo 315211, Peoples R China
[3] NAS Ukraine, Inst Met Phys, 36 Vernadsky Str, UA-03142 Kiev, Ukraine
关键词
Grain coarsening; Nano laminated structure; Lubricated sliding; Triple junctions; TRIPLE JUNCTION MOTION; TRIBOLOGICAL PROPERTIES; DEFORMATION-BEHAVIOR; PLASTIC-DEFORMATION; COPPER; MECHANISM; RECOVERY; GROWTH; LAYER; RECRYSTALLIZATION;
D O I
10.1016/j.triboint.2020.106381
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The sliding wear-induced grain coarsening of nano laminated structure in a martensite steel was investigated by using Transmission Electron Microscopy (TEM) and transmission Kikuchi diffraction (TKD). Microstructure was initially refined into nano laminated structure by dry sliding. In the subsequent lubricated sliding, the nano laminated structure became coarsened instead of being continuously refined. Equiaxed grains and subgrains were observed in the laminated structure under 60 min dry + 60 min lubricated sliding, as compared to the coarsened but still remained lamellar structure under 120 min dry + 60 min lubricated sliding. In contrast to the grain refinement, which was mechanically driven but thermally assisted, the grain coarsening was mechanically dominated without involving the thermal effect. The nano laminated structure did not show strong texture before and after coarsening. The continuous grain growth occurred even if the stress was reduced in the lubricated sliding. The high density of triple junctions in the nano laminated structure promotes grain boundary motion, facilitating the grain coarsening.
引用
收藏
页数:9
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