回火温度对大尺寸锻态35CrMo钢微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.08.039

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 232-236.DOI: 10.13251/j.issn.0254-6051.2022.08.039

回火温度对大尺寸锻态35CrMo钢微观组织和力学性能的影响

廖佳¹, 付涛², 王晓巍³, 余胜峰¹, 王瑞麒¹, 彭飞⁴

1.中国第二重型机械集团德阳万航模锻有限责任公司, 四川德阳 618000;
2.中航飞机起落架有限责任公司, 陕西汉中 723200;
3.沈阳飞机工业(集团)有限公司, 辽宁沈阳 110034;
4.湖南大学材料科学与工程学院, 湖南长沙 410082

收稿日期:2022-02-24 修回日期:2022-06-03 出版日期:2022-08-25 发布日期:2022-09-19
作者简介:廖佳(1986—),男,高级工程师,硕士,主要研究方向为金属热处理,E-mail:15881479901@163.com。

Influence of tempering temperature on microstructure and mechanical properties of forged 35CrMo steel with large-scale

Liao Jia¹, Fu Tao², Wang Xiaowei³, Yu Shengfeng¹, Wang Ruiqi¹, Peng Fei⁴

1. China National Erzhong Group Wanhang Die Forging Co., Ltd., Deyang Sichuan 618000, China;
2. AVIC Landing-gear Advanced Manufacturing Co., Hanzhong Shaanxi 723200, China;
3. Shenyang Aircraft Corporation, Shenyang Liaoning 110034, China;
4. School of Materials Science and Engineering, Hunan University, Changsha Hunan 410082, China

Received:2022-02-24 Revised:2022-06-03 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

摘要： 研究了回火温度对大尺寸锻态35CrMo钢调质处理后组织特性及力学性能的影响,特别针对回火过程中渗碳体的析出动力学及大尺寸试块的组织性能不均匀性展开了分析。结果表明,锻坯热处理前的铁素体、珠光体带状组织经调质处理后完全消除,最终组织为含有大量渗碳体析出的回火马氏体,同时试块心部包含少量分布于原奥氏体晶界的回火贝氏体。回火过程中渗碳体的析出分为C扩散控制的快速长大阶段和Cr扩散控制的尺寸稳定阶段。锻态35CrMo钢经调质处理后仍存在力学性能各向异性,随着回火温度的升高,试验钢横、纵向强度下降,塑性和韧性同步提升。经综合考虑,当回火温度为570 ℃时,其强度、塑性和韧性具有最优匹配。

关键词: 35CrMo钢, 调质, 渗碳体, 力学性能, 各向异性

Abstract: Influence of tempering temperature on microstructural characteristics and mechanical properties of forged 35CrMo steel with large-scale was investigated after quenching and tempering, especially focusing on the dynamics of cementite precipitation during tempering process and the inhomogeneity of microstructure and mechanical properties. The results show that the banded microstructure of ferrite and pearlite in the forged steel can be completely eliminated after quenching and tempering, the microstructure is mainly composed of tempered martensite with abundant cementite, and some tempered bainite along prior austenite grain boundary is also observed. The kinetics of cementite precipitation can be divided into two stages comprising rapid growth stage controlled by C diffusion and steady size stage controlled by Cr diffusion. The anisotropy of mechanical properties still exists in the forged 35CrMo steel after quenching and tempering. With the increase of tempering temperature, the transverse and longitudinal strengths decrease, while the ductility and toughness are improved concurrently. It is concluded that the optimal combination of strength, ductility and toughness can be obtained when tempered at 570 ℃。

Key words: 35CrMo steel, quenching and tempering, cementite, mechanical properties, anisotropy

中图分类号:

TG142.1

廖佳, 付涛, 王晓巍, 余胜峰, 王瑞麒, 彭飞. 回火温度对大尺寸锻态35CrMo钢微观组织和力学性能的影响[J]. 金属热处理, 2022, 47(8): 232-236.

Liao Jia, Fu Tao, Wang Xiaowei, Yu Shengfeng, Wang Ruiqi, Peng Fei. Influence of tempering temperature on microstructure and mechanical properties of forged 35CrMo steel with large-scale[J]. Heat Treatment of Metals, 2022, 47(8): 232-236.

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回火温度对大尺寸锻态35CrMo钢微观组织和力学性能的影响

Influence of tempering temperature on microstructure and mechanical properties of forged 35CrMo steel with large-scale

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