C含量对HT9钢组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.12.042

金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 255-259.DOI: 10.13251/j.issn.0254-6051.2023.12.042

C含量对HT9钢组织和力学性能的影响

谢谱^1,2, 赵吉庆², 颜廷亭¹

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2023-07-08 修回日期:2023-10-01 出版日期:2023-12-25 发布日期:2024-01-29
通讯作者: 赵吉庆,工程师,博士研究生,E-mail: zhaojiqing@nercast.com
作者简介:谢谱(1998—),男,硕士研究生,主要研究方向为耐热钢成分优化,E-mail: 1203846848@qq.com。
基金资助:
国家自然科学基金(51971226)

Effect of C content on microstructure and mechanical properties of HT9 steel

Xie Pu^1,2, Zhao Jiqing², Yan Tingting¹

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Research Institute for Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-07-08 Revised:2023-10-01 Online:2023-12-25 Published:2024-01-29

摘要/Abstract

摘要： 借助光镜(OM)、扫描电镜(SEM)、透射电镜(TEM)及拉伸试验机等设备,研究了碳含量变化对HT9钢显微组织及力学性能的影响。结果表明,C含量的变化对碳化物含量及性能有着显著的影响。随着C含量的增加,Ni_eq增大,抑制了δ-Fe的析出;C还促进了M₂₃C₆碳化物的析出,阻碍了马氏体板条的迁移,导致板条细化,析出强化和界面强韧化效果增强,提高了钢的强度和硬度,降低了材料的塑韧性。且C含量在0.17%~0.20%范围内,这种变化最为显著,这主要与钢中溶质原子析出,固溶强化效果下降有关。

关键词: HT9钢, M₂₃C₆, δ-Fe, 力学性能, 显微组织

Abstract: Effect of carbon content change on the microstructure and mechanical properties of HT9 steel was studied by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile testing machines. The results show that the change of C content has a significant impact on the content of carbides and properties. With the increase of C content, the Ni_eq increases, which inhibits the precipitation of δ-Fe; the C also promotes the precipitation of M₂₃C₆ carbides, hinders the migration of martensitic laths, and leads to lath refinement, precipitation strengthening and interface strengthening, which increases the strength and hardness of the steel and reduces the plasticity and toughness of the material. When the C content is in the range of 0.17%-0.20%, this change is the most significant, which is mainly related to the precipitation of solute atoms in the steel and the decline of solution strengthening effect.

Key words: HT9 steel, M₂₃C₆, δ-Fe, mechanical properties, microstructure

中图分类号:

TG142.1

谢谱, 赵吉庆, 颜廷亭. C含量对HT9钢组织和力学性能的影响[J]. 金属热处理, 2023, 48(12): 255-259.

Xie Pu, Zhao Jiqing, Yan Tingting. Effect of C content on microstructure and mechanical properties of HT9 steel[J]. Heat Treatment of Metals, 2023, 48(12): 255-259.

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C含量对HT9钢组织和力学性能的影响

Effect of C content on microstructure and mechanical properties of HT9 steel

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