热处理对42CrMo钢截齿微观组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.06.001

摘要/Abstract

摘要： 以国外同类产品为参考, 采用复相处理以及局部感应淬火等多种热处理工艺, 研究了42CrMo钢截齿的硬度、冲击吸收能量, 并表征了微观组织、断口形貌等, 分析了热处理工艺对微观组织和力学性能的影响。结果表明, 复相热处理工艺的组织均为下贝氏体/马氏体(LB/M)以及少量残留奥氏体(RA), 晶粒更细小且LB具有更好的综合力学性能, 比淬火和低温回火(Q-T)工艺的冲击吸收能量更高;局部感应淬火工艺不但冲击吸收能量和齿头硬度最高, 而且实现了齿头硬、齿柄软的轴向硬度分布, 利于延长服役寿命;Q-T工艺处理后的试样冲击断口呈解理脆断形貌, 复相处理的试样呈准解理断裂形貌, 局部感应淬火处理的冲击试样呈韧性断裂形貌, 得益于调质态(Q&T)组织的优良力学性能。试验数据表明, 调质和局部感应淬火的热处理工艺更适合用于硬基材作业的截齿产品。

关键词: 42CrMo钢, 截齿, 热处理工艺, 微观组织, 力学性能

Abstract: Taking foreign similar products as references, many kinds of duplex-phase and induction quenching treatments were applied to 42CrMo steel picks. Hardness, impact absorbed energy, microstructure and fracture morphology of the 42CrMo steel picks after different heat treatments were investigated. The effects of heat treatments on microstructure and mechanical properties were analyzed. The results show that after duplex-phase heat treatment process, the microstructure includes lower bainite/martensite (LB/M) and a small amount of retained austenite (RA), grain size is smaller and LB has better comprehensive mechanical properties, and impact absorbed energy is higher than that after quenching and low temperature tempering (Q-T) process. Local induction quenching process not only has the highest impact absorbed energy and the hardness of pick head, but also realizes the axial hardness distribution of hard head and soft handle of the pick, which is beneficial to extending the service life. The fracture morphology of the specimen treated by Q-T process shows cleavage brittle fracture morphology, the specimen treated by multiphase shows quasi cleavage fracture morphology, and the impact specimen treated by local induction quenching shows ductile fracture morphology, which is resulted from the excellent mechanical properties of the quenched and tempered (Q&T) microstructure. The tested data show that the Q&T plus local induction quenching is more suitable for picks used in hard substrate.

Key words: 42CrMo steel, pick, heat treatment process, microstructure, mechanical properties

中图分类号:

TG156

袁志钟, 王梦飞, 段旭斌, 杨海峰, 李表敏, 罗锐, 赵小强, 程晓农. 热处理对42CrMo钢截齿微观组织与力学性能的影响[J]. 金属热处理, 2023, 48(6): 1-8.

Yuan Zhizhong, Wang Mengfei, Duan Xubin, Yang Haifeng, Li Biaomin, Luo Rui, Zhao Xiaoqiang, Cheng Xiaonong. Effect of heat treatment on microstructure and mechanical properties of 42CrMo steel picks[J]. Heat Treatment of Metals, 2023, 48(6): 1-8.

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