34CrNiMo6钢曲轴轴颈感应淬火硬化微观机理

doi:10.13251/j.issn.0254-6051.2024.01.039

金属热处理 ›› 2024, Vol. 49 ›› Issue (1): 242-248.DOI: 10.13251/j.issn.0254-6051.2024.01.039

34CrNiMo6钢曲轴轴颈感应淬火硬化微观机理

汪英芝¹, 谢波², 纪超², 王红霞¹, 郑留伟^1,3, 梁伟^1,3

1. 太原理工大学材料科学与工程学院, 山西太原 030024;
2. 山西柴油机工业有限责任公司, 山西大同 037036;
3. 太原理工大学分析测试中心, 山西晋中 030600

收稿日期:2023-08-02 修回日期:2023-11-07 发布日期:2024-02-29
通讯作者: 郑留伟,副教授,博士,E-mail: zhengliuwei@tyut.edu.cn
作者简介:汪英芝(1999—),女,硕士研究生,主要研究方向为金属热处理,E-mail: 2317150245@qq.com。
基金资助:
山西省自然科学基金(20210302123135, 20210302123163);山西省科技成果转换引导专项(202104021301022);山西省重大专项(20191102008)

Microscopic mechanism of induction hardening of 34CrNiMo6 steel crankshaft journal

Wang Yingzhi¹, Xie Bo², Ji Chao², Wang Hongxia¹, Zheng Liuwei^1,3, Liang Wei^1,3

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Shanxi Diesel Engine Industry Co., Ltd., Datong Shanxi 037036, China;
3. Analysis and Test Center, Taiyuan University of Technology, Jinzhong Shanxi 030600, China

Received:2023-08-02 Revised:2023-11-07 Published:2024-02-29

摘要/Abstract

摘要： 利用显微硬度计测试了34CrNiMo6钢曲轴轴颈在460、480、500 V淬火电压下,经中频表面感应淬火+300 ℃回火后的硬度值。利用光学显微镜(OM)、扫描电镜(SEM、EBSD)、X射线衍射分析仪(XRD)观察不同淬火电压下轴颈组织演变,研究了组织演变对曲轴钢表面硬度的影响机制。结果表明,在460、480、500 V电压感应淬火后,各试样表层硬度均有明显提高,并在次表层硬度达到最大。这主要是由于经不同电压表面感应淬火后,各试样不同区域组织不同,相的含量不同、位错密度不同造成的。根据组织及硬度分布的不同,轴颈由表及里可分为淬硬层、过渡层及心部。淬硬层深度、硬度与淬火电压呈正相关。

关键词: 34CrNiMo6钢曲轴, 感应淬火, 显微组织, 硬度

Abstract: Hardness value of 34CrNiMo6 steel crankshaft journal after induction hardening with intermediate frequency and tempering at 300 ℃ was tested under quenching voltages of 460 V, 480 V and 500 V through microhardness tester. The microstructure evolution of the journal under different quenching voltages, and the influence mechanism of microstructure evolution on the surface hardness of the crankshaft steel was observed and studied by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometer (EBSD) and X-ray diffraction analyzer (XRD). The results show that after induction hardening at 460 V, 480 V and 500 V, the surface hardness of each specimen is significantly improved, and the hardness of the subsurface layer reaches the maximum. This is mainly due to the different microstructure, phase contents and dislocation densities in different regions of each specimen after surface induction hardening at different voltages. According to the different structures and hardness distribution, the journal can be divided into hardened layer, transition layer and core from the surface to the inside. The depth and hardness of the hardened layer are positively correlated with the quenching voltage.

Key words: 34CrNiMo6 steel crankshaft, induction hardening, microstructure, hardness

中图分类号:

TG156.33

汪英芝, 谢波, 纪超, 王红霞, 郑留伟, 梁伟. 34CrNiMo6钢曲轴轴颈感应淬火硬化微观机理[J]. 金属热处理, 2024, 49(1): 242-248.

Wang Yingzhi, Xie Bo, Ji Chao, Wang Hongxia, Zheng Liuwei, Liang Wei. Microscopic mechanism of induction hardening of 34CrNiMo6 steel crankshaft journal[J]. Heat Treatment of Metals, 2024, 49(1): 242-248.

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34CrNiMo6钢曲轴轴颈感应淬火硬化微观机理

Microscopic mechanism of induction hardening of 34CrNiMo6 steel crankshaft journal

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