Effect of multiple thermal cycling on the microstructure and microhardness of Inconel 625 by high-speed laser cladding

材料科学 微观结构 压痕硬度 包层(金属加工) 激光器 电子背散射衍射 因科镍合金 复合材料 温度循环 因科镍合金625 热的 冶金 焊接 光学 合金 物理 气象学
作者
Kai Fu,Cheng Zhong,Liang Zhang,Xiaoming Wang,Baoxian Nie,Yanpeng Xue,Wanyuan Gui,Benli Luan
出处
期刊:Journal of materials research and technology [Elsevier BV]
卷期号:24: 1093-1107 被引量:25
标识
DOI:10.1016/j.jmrt.2023.03.064
摘要

Establishing the relationship between thermal cycling and the induced evolution of microstructures and cladding layer properties is crucial to achieving microstructural and performance control, given the complexity involved in high-speed laser cladding process. We hereby report our new findings from laser cladding of Inconel 625 on Q245R steel substrate using a high-speed laser cladding technique. The microstructure evolution and microhardness variations in the first cladding track with different thermal cycles were examined by XRD, SEM, EBSD, TEM, and microhardness tests in detail. Numerical simulation was also conducted to characteristically illustrate the complex thermal cycles during the laser cladding process. Our work revealed that the first six thermal cycles resulted in significant variations of microstructure in the laser cladding layers. The dislocation density and low angle grain boundaries (LAGBs) of the first cladding track decreased after two thermal cycles due to the high peak temperature (above 1000 °C) of thermal cycles and subsequently increased when subjected to further thermal cycles with low peak temperature (below 500 °C). The microhardness value increased from 220 HV0.2 to 320 HV0.2, mainly caused by the formation of precipitated phase during the first four thermal cycles, and through by the enhancement of dislocations after six thermal cycles.
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