微合金中碳钢48MnV曲轴连杆轴颈感应淬火工艺的优化

doi:10.13251/j.issn.0254-6051.2023.02.033

金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 212-218.DOI: 10.13251/j.issn.0254-6051.2023.02.033

微合金中碳钢48MnV曲轴连杆轴颈感应淬火工艺的优化

毛晓峰¹, 李亚军², 邓诗贵¹, 李新凯², 赵欢², 王荣²

1.桂林福达股份有限公司, 广西桂林 541199;
2.桂林电子科技大学机电工程学院, 广西桂林 541004

收稿日期:2022-09-28 修回日期:2023-01-02 出版日期:2023-02-25 发布日期:2023-03-22
通讯作者: 王荣,教授,博士,E-mail:wr6056@guet.edu.cn
作者简介:毛晓峰(1985—),男,工程师,硕士,主要研究方向为金属材料表面改性,E-mail:maoxiaofeng@glfoto.cn。
基金资助:
广西自然科学基金(2020GXNSFBA297079);桂林市重点研发计划(20211B032068)

Induction hardening process optimization of microalloyed medium carbon steel 48MnV for crankshaft connecting rod journal

Mao Xiaofeng¹, Li Yajun², Deng Shigui¹, Li Xinkai², Zhao Huan², Wang Rong²

1. Guilin Fuda Co., Ltd., Guilin Guangxi 541199, China;
2. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin Guangxi 541004, China

Received:2022-09-28 Revised:2023-01-02 Online:2023-02-25 Published:2023-03-22

摘要/Abstract

摘要： 采用对比试验法,以淬火功率、回火条件、加热时间、冷却时间等作为变量,研究了微合金中碳钢48MnV曲轴连杆轴颈感应热处理的最佳工艺。结果表明,优化的感应热处理工艺为淬火功率165 kW,电流频率9 kHz ,加热时间17 s,冷却间隔时间1 s,冷却时间20 s,210 ℃回火2.5 h。在优化的感应热处理工艺下,连杆轴颈淬硬层显微组织为细小均匀针状马氏体;轴颈表面、两侧过渡圆角距表面0.25 mm处的最高硬度依次可达720.9、690.0和667.1 HV,耐磨性显著提高;连杆轴颈、过渡圆角表面残余应力呈现为压应力,靠芯轴端过渡圆角残余应力高达-884.0 MPa,靠法兰端过渡圆角残余应力为-831.9 MPa;试样的疲劳极限载荷最高,高达3750 N·m。感应热处理后残余压应力越大,越有利于提高曲轴连杆轴颈的弯曲疲劳强度。

关键词: 48MnV微合金中碳钢, 曲轴连杆轴颈, 感应淬火, 显微组织, 疲劳强度

Abstract: Optimum process of induction heat treatment of microalloyed medium carbon steel 48MnV crankshaft connecting rod journal was studied by means of contrast test with quenching energy, tempering conditions, heating time and cooling time as variables. The results show that the optimized induction heat treatment process consists of quenching power of 165 kW, current frequency of 9 kHz, heating time of 17 s, cooling interval time of 1 s, cooling time of 20 s, and tempering at 210 ℃ for 2.5 h. Under the optimized induction heat treatment process, the microstructure of the hardened layer of connecting rod journal is fine and uniform acicular martensite; the maximum hardness of the journal surface and the position 0.25 mm from the surface of fillet on both sides can reach 720.9, 690.0 and 667.1 HV, respectively, and the wear resistance is significantly improved; the residual stress on the surface of connecting rod journal and fillet is compressive stress, the residual stress of the transition fillet near the spindle end is up to -884.0 MPa, and the residual stress of the transition fillet near the flange end is -831.9 MPa. The fatigue limit load of the specimen is the highest, up to 3750 N·m. The greater the residual compressive stress after induction heat treatment, the better the bending fatigue strength of the crankshaft connecting rod journal.

Key words: 48MnV microalloyed medium carbon steel, crankshaft connecting rod journal, induction hardening, microstructure, fatigue strength

中图分类号:

毛晓峰, 李亚军, 邓诗贵, 李新凯, 赵欢, 王荣. 微合金中碳钢48MnV曲轴连杆轴颈感应淬火工艺的优化[J]. 金属热处理, 2023, 48(2): 212-218.

Mao Xiaofeng, Li Yajun, Deng Shigui, Li Xinkai, Zhao Huan, Wang Rong. Induction hardening process optimization of microalloyed medium carbon steel 48MnV for crankshaft connecting rod journal[J]. Heat Treatment of Metals, 2023, 48(2): 212-218.

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微合金中碳钢48MnV曲轴连杆轴颈感应淬火工艺的优化

Induction hardening process optimization of microalloyed medium carbon steel 48MnV for crankshaft connecting rod journal

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