等温球化退火对热轧态65Mn钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.10.030

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 192-196.DOI: 10.13251/j.issn.0254-6051.2025.10.030

等温球化退火对热轧态65Mn钢组织与性能的影响

狄彦军¹, 平玲玲², 徐学明², 张家和², 唐兴昌^2,3

1.甘肃酒钢集团宏兴钢铁股份有限公司钢铁研究院, 甘肃嘉峪关 735100;
2.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
3.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050

收稿日期:2025-04-07 修回日期:2025-07-22 出版日期:2025-10-25 发布日期:2025-11-04
作者简介:狄彦军(1989—),男,高级工程师,主要研究方向为碳钢产品研究开发,E-mail: diyanjun@jiugang.com

Effect of isothermal spheroidizing annealing on microstructure and properties of hot-rolled 65Mn steel

Di Yanjun¹, Ping Lingling², Xu Xueming², Zhang Jiahe², Tang Xingchang^2,3

1. Iron and Steel Research Institute of Gansu JISCO Hongxing Iron and Steel Co., Ltd., Jiayuguan Gansu 735100, China;
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
3. State Key Laboratory of Advanced Processing and Reuse of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou Gansu 730050, China

Received:2025-04-07 Revised:2025-07-22 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 研究了等温球化退火温度(510~730 ℃)对热轧态65Mn钢显微组织与力学性能的影响。结果表明,经球化退火处理后65Mn 弹簧钢的塑性得到显著改善。在一定的保温时间下,球状渗碳体随着退火温度的升高逐渐析出,材料延展性提升,硬度随之下降。当退火温度达到610 ℃时,球状渗碳体发生粗化,球化效果进一步增强,延展性进一步提高,硬度继续降低。当退火温度升高至660 ℃以上时,组织中开始析出部分片状渗碳体,导致硬度回升,延展性下降,同时抗拉强度上升。

关键词: 65Mn钢, 球化退火, 微观组织, 力学性能

Abstract: Effect of isothermal spheroidizing annealing temperature (510-730 ℃) on microstructure and mechanical properties of hot-rolled 65Mn steel was studied. The results show that the plasticity of the 65Mn spring steel is significantly improved after spheroidizing annealing. Under a specific holding time, spheroidal cementite gradually precipitates with the increase of annealing temperature, leading to that the ductility increases and the hardness decreases correspondingly. When the annealing temperature reaches 610 ℃, the spheroidal cementite is coarsened, which further improves the spheroidization effect. As a result, the ductility increases continuously, while the hardness further decreases. However, when the annealing temperature exceeds 660 ℃, partial lamellar cementite begins to precipitate within the microstructure, resulting in that the hardness increases, the ductility decreases and the tensile strength increases.

Key words: 65Mn steel, spheroidizing annealing, microstructure, mechanical properties

中图分类号:

TG142

狄彦军, 平玲玲, 徐学明, 张家和, 唐兴昌. 等温球化退火对热轧态65Mn钢组织与性能的影响[J]. 金属热处理, 2025, 50(10): 192-196.

Di Yanjun, Ping Lingling, Xu Xueming, Zhang Jiahe, Tang Xingchang. Effect of isothermal spheroidizing annealing on microstructure and properties of hot-rolled 65Mn steel[J]. Heat Treatment of Metals, 2025, 50(10): 192-196.

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等温球化退火对热轧态65Mn钢组织与性能的影响

Effect of isothermal spheroidizing annealing on microstructure and properties of hot-rolled 65Mn steel

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