Numerical simulation of laser hardening of 40Cr steel hob textured surface

doi:10.13251/j.issn.0254-6051.2024.05.008

Abstract

Abstract: Numerical simulation was conducted on the textured surface of 40Cr steel shield tunneling cutter after laser hardening. By simulating the temperature changes during laser hardening, the phase transformation caused by temperature changes during laser hardening was analyzed, as well as the formation mechanism of the laser hardened layer. The morphology of the hardened layer on the 40Cr steel shield tunneling cutter after laser hardening was observed. Friction and wear tests were projected on 40Cr steel, 40Cr steel shield tunneling cutter textured surface, and laser hardened 40Cr steel shield tunneling cutter textured surface to study their friction and wear properties. The results show that there is a parallel groove like texture on the surface of the 40Cr steel shield tunneling cutter. This texture and laser hardening can effectively improve the wear resistance of the cutter. After laser hardening, the textured surface of the shield tunneling cutter has the highest wear resistance, with a cross-sectional worn area of 47.3% of the textured surface of the shield tunneling cutter and 37.3% of the non textured surface of the 40Cr steel. The finite element numerical simulation is reliable and laser hardening can effectively improve the wear resistance of the shield tunneling cutter.

Key words: laser hardening, texture, numerical simulation, friction

CLC Number:

TG156.34

Zhang Shuaikun, Zhang Chaoyong, Wu Jianzhao, Tang Limei. Numerical simulation of laser hardening of 40Cr steel hob textured surface[J]. Heat Treatment of Metals, 2024, 49(5): 47-54.

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