Microstructure and mechanical properties of laser hardened surface of 45Mn steel engine chain plate

doi:10.13251/j.issn.0254-6051.2023.04.040

Abstract

Abstract: In order to solve the problem of severe wear between inner and outer chain plates of large marine engine chain, the surface modification technology of laser quenching was proposed to improve the mechanical properties of chain plate surface. The single-channel and multi-channel laser quenching tests were carried out on the surface of the 45Mn steel, and the microstructure and hardness changes after laser quenching were analyzed.The results show that the phase transformation hardening zone dominated by slatted martensite and fine martensite was formed after single-pass laserquenching. When the laser power is 300-900 W and the scanning speed is 5-20 mm/s, the surface hardness of the 45Mn steel after single laser quenching is 850-950 HV, the effective hardening depth is about 0.63 mm, and the wear volume decreases to 45.1%-53.0% of that without laser quenching and without changing the surface roughness. Multi-pass lap laser quenching forms a softened zone dominated by tempered martensite. After multi-channel laser quenching with overlap rate of 30%, the surface hardness of the 45Mn steel is relatively average, and the width of temper softening zone is 0.68 mm.

Key words: 45Mn steel, laser quenching, mechanical properties, overlapping rate, temper softening

CLC Number:

TG162.79

Li Xiao, Yang Yong, Gong Chunhong. Microstructure and mechanical properties of laser hardened surface of 45Mn steel engine chain plate[J]. Heat Treatment of Metals, 2023, 48(4): 257-263.

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