回火温度对柔性齿轮钢40CrNiMo组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.08.019

金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 99-104.DOI: 10.13251/j.issn.0254-6051.2021.08.019

回火温度对柔性齿轮钢40CrNiMo组织及力学性能的影响

刘笑笑¹, 张铮¹, 张杰², 杨燃², 俞城双², 韩丽娜¹, 乔珺威¹

1.太原理工大学材料科学与工程学院, 山西太原 030024;
2.浙江来福谐波传动股份有限公司, 浙江绍兴 312462

收稿日期:2021-04-05 出版日期:2021-08-25 发布日期:2021-12-09
通讯作者: 乔珺威,教授,E-mail:qiaojunwei@gmail.com
作者简介:刘笑笑(1995—),女,硕士研究生,主要研究方向为柔性齿轮40CrNiMo钢的性能,E-mail:18649512568@163.com。
基金资助:
山西省自然科学基金(201901D111105,201901D111114)

Effect of tempering temperature on microstructure and mechanical properties of 40CrNiMo steel for flexible gear

Liu Xiaoxiao¹, Zhang Zheng¹, Zhang Jie², Yang Ran², Yu Chengshuang², Han Lina¹, Qiao Junwei¹

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Zhejiang Laifual Drive Co., Ltd., Shaoxing Zhejiang 312462, China

Received:2021-04-05 Online:2021-08-25 Published:2021-12-09

摘要/Abstract

摘要： 通过预处理(固溶处理)、等温淬火以及不同温度回火等处理方法,利用光学显微镜、扫描电镜、洛氏硬度计、拉伸试验机、冲击试验机等设备研究了奥氏体化温度对40CrNiMo钢奥氏体晶粒长大速度以及硬度的影响,探索了回火温度对贝氏体/马氏体多相钢微观组织和力学性能的影响。结果显示,预处理期间,奥氏体晶粒随奥氏体化温度的升高首先缓慢增长然后快速长大,然而硬度保持在56 HRC左右。250~500 ℃回火时,大量细小的碳化物析出,微观组织仍然保持原来的板条状,试验钢的强度、硬度降低,塑韧性呈现先降低后升高的趋势;400 ℃回火试样伸长率最低,冲击吸收能量最小,表明400 ℃回火时出现回火脆性;回火温度升高到600 ℃,基体组织发生再结晶,转变为回火索氏体,此时强、硬度最低,冲击吸收能量高达147 J。

关键词: 40CrNiMo钢, 奥氏体化温度, 回火温度, 力学性能

Abstract: Through pre-treatment (solid solution), austenitizing and tempering at different temperatures, effect of austenitizing temperature on growth rate of austenitic grain and the hardness of the 40CrNiMo steel was studied by means of optical microscope, scanning electron microscope, Rockwell hardness tester, tensile testing machine and impact testing machine, and the effect of tempering temperature on microstructure and mechanical properties of bainite/martensite multiphase steel was explored. The results show that the austenitic grains grow slowly first and then rapidly with the increase of austenitizing temperature during the pre-treatment, but the hardness value of the steel remains about 56 HRC. A large number of fine carbides precipitate and microstructure remains the original plate strip shape at the temperature range from 250 ℃ to 500 ℃, and the strength and hardness of the tested steel decrease, while the plasticity and toughness decrease first and then increase with the increase of tempering temperature. When tempered at 400 ℃, the lowest elongation and the lowest impact absorbed energy are obtained, which indicates that tempering brittleness occurs when tempered at 400 ℃. When the tempering temperature rises to 600 ℃, the matrix structure transforms into tempering sorbite, and the strength and hardness of the tested steel are the lowest but the impact absorbed energy is up to 147 J.

Key words: 40CrNiMo steel, austenitizing temperature, tempering temperature, mechanical properties

中图分类号:

刘笑笑, 张铮, 张杰, 杨燃, 俞城双, 韩丽娜, 乔珺威. 回火温度对柔性齿轮钢40CrNiMo组织及力学性能的影响[J]. 金属热处理, 2021, 46(8): 99-104.

Liu Xiaoxiao, Zhang Zheng, Zhang Jie, Yang Ran, Yu Chengshuang, Han Lina, Qiao Junwei. Effect of tempering temperature on microstructure and mechanical properties of 40CrNiMo steel for flexible gear[J]. Heat Treatment of Metals, 2021, 46(8): 99-104.

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回火温度对柔性齿轮钢40CrNiMo组织及力学性能的影响

Effect of tempering temperature on microstructure and mechanical properties of 40CrNiMo steel for flexible gear

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