Local surface laser quenching process of 12CrNi3 steel outside locking sleeve

doi:10.13251/j.issn.0254-6051.2020.06.016

Abstract

Abstract: The surface quenching test was operated on the 12CrNi3 outside locking sleeve by using semiconductor laser broadband, the microstructure, hardness and wear resistance of parts after treatment were detected and analyzed. The results show that the surface flatness is best after single pass scanning by the method of fixed spot, with the distance from the laser head to the center of the scanning area of workpiece 375 mm, the workpiece tilt 22°, the laser head tilt 18°, temperature 1350 ℃ and scanning speed 9 mm/s. The laser surface hardening with 750-1000 μm, but the shallowest is 443.1 μm. The structure of the hardening zone is fine martensite, hardness is up to 600-700 HV0.2, which is the 2 times of the matrix and about 1.3 times of the specimens after carburizing and quenching, and the wear resistance of the laser transformation hardening zone is obviously enhanced.

Key words: outside locking sleeve, laser surface hardening, microstructure, wear resistance

CLC Number:

TG162.79

Li Ling, Meng Xuan, Zhao Zhipeng, Yue Jiahong, Qi Ting. Local surface laser quenching process of 12CrNi3 steel outside locking sleeve[J]. Heat Treatment of Metals, 2020, 45(6): 72-76.

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