Laser surface strengthening of 42CrMo steel for bending die

doi:10.13251/j.issn.0254-6051.2020.08.043

Abstract

Abstract: Laser surface quenching characteristics of bending die made of 42CrMo steel were studied by means of SEM and EBSD. The results show that the laser scanning speed, power and workpiece thickness have significant influence on the depth and hardness of the hardened layer. Under the condition of 2200 W laser power, 1800 mm/min scanning speed, 2 mm of spot diameter, auxiliary water cooling and one pass scanning, the hardness and hardened layer thickness of the bending die blade reach 734 HV0.2 and 1.05 mm respectively, and the hardness distributions are uniform on both sides of the blade. The microstructure of the laser hardened layer was fine martensite, especially near the substrate.

Key words: 42CrMo steel, bending die, laser surface strengthening, hardness, uniformity

CLC Number:

TG156.33

Wang Huizhen, Zhai Yuewen, Zhou Leyu. Laser surface strengthening of 42CrMo steel for bending die[J]. Heat Treatment of Metals, 2020, 45(8): 222-227.

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