材料科学
残余应力
包层(金属加工)
复合材料
涂层
热冲击
制动器
疲劳极限
晶界
极限抗拉强度
法律工程学
冶金
微观结构
工程类
作者
Guanglei Liu,Wen-chao Xue,Yu-hao Cao,Xin Sun,Zhiqiang Li,Fu-hai Xu,Haixia Liu,Jing Zhou
标识
DOI:10.1016/j.jallcom.2022.168305
摘要
After the laser cladding repair of the brake disc surface in high-speed trains, thermal fatigue cracks in the cladding layer and bonding area are easily observed during the service process. With the aim of solving this problem and decreasing hidden risks, effects of laser shock processing (LSP) on the thermal fatigue life and crack growth behavior of the coating and bonding area of the brake disc were investigated. The results indicate that LSP can refine the columnar grain structures of the cladding layer and bonding area while simultaneously converting residual tensile stress into compressive stress; as a result, the thermal fatigue performance of the brake disc repaired by laser cladding is enhanced. After strengthening by LSP, on the one hand, grain refinement made the structure more uniform and generated more grain boundaries; on the other hand, a pre-set compressive stress field in the cladding layer and bonding area existed. Both aspects were beneficial to dissipate the alternating stress generated by the thermal fatigue process, dissipating the driving force of crack extension and promoting the transformation of thermal fatigue cracks from lateral growth along the interface between the cladding layer and bonding area to the growth into the substrate.
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