Microstructure Distribution and Grain Coarsening Model of GCr15 Steel in the Laser Surface Treatment

Jin‑shan Chen; Zhen‑xing Li; Ya‑jie Chu; Jie Chen; Xin‑jun Shen

doi:10.1007/s12540-021-01148-7

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자료유형: 학술저널

저자정보: Jin‑shan Chen (Nanjing Institute of Technology) Zhen‑xing Li (Nanjing Institute of Technology) Ya‑jie Chu (Nanjing Institute of Technology) Jie Chen (Wenzhou University) Xin‑jun Shen (Soochow University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10

발행연도: 2022.10

수록면: 2,318 - 2,329 (12page)

DOI: 10.1007/s12540-021-01148-7

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The GCr15 steel was subjected to laser surface treatment using a diode laser with rectangular spot. Based on the simulatedtemperature field, the microstructure distribution of the laser hardened layer was analyzed, and an empirical equation wasproposed to predict the peak temperature at different depths. The results indicated that with the decrease of depth, the peaktemperature increased exponentially, and the peak temperature at different depths was approximately linear with the powerdensity and the reciprocal of square root of scanning speed. High peak temperature led to the coarsening of grain and thesignificant dissolution of cementite near the surface of hardened layer. At the deeper position of hardened layer, the prioraustenite grain size decreased slightly due to high nucleation rate. The cementite dissolution and coarsening occurred simultaneouslynear the surface, and the cementite dissolution process was postponed due to the significant enrichment of Cr nearthe interface of austenite and cementite. Additionally, an empirical model about grain coarsening was established, which canbe used to predict the prior austenite grain size near the surface during the laser surface treatment.

#GCr15 steel · Laser surface treatment · Peak temperature · Grain coarsening model · Cementite dissolution

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