回火工艺对HT9钢组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.03.008

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 44-49.DOI: 10.13251/j.issn.0254-6051.2024.03.008

回火工艺对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:2023-08-30 修回日期:2024-01-11 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 赵吉庆,工程师,博士,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 tempering process on microstructure and 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 of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-08-30 Revised:2024-01-11 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 利用SEM、TEM、相分析和拉伸、冲击试验,研究了不同回火工艺对HT9钢组织演变及力学性能的影响。结果表明,回火工艺通过影响析出相和位错来改变钢的力学性能;HT9钢在回火后的基体组织为板条马氏体,强化相为M₂₃C₆碳化物,未观察到其他析出相。随着回火温度升高,基体组织发生回复,位错缠结逐渐规整、减薄为位错网络,形成亚晶,M₂₃C₆碳化物发生Ostwald熟化,析出强化和位错强化作用减弱,强度和硬度降低,韧性上升;在770 ℃回火1~12 h,随着回火时间延长,基体组织回复,M₂₃C₆相发生熟化,强度和硬度逐渐降低并伴有一定的时间依赖性。结合力学性能标准,热处理制度为1040 ℃淬火1 h＋770 ℃回火6 h 时,HT9钢的强韧性匹配较好。

关键词: HT9钢, M₂₃C₆相, 组织, 力学性能, 热处理工艺, 位错

Abstract: Effect of tempering process on microstructure evolution and mechanical properties of HT9 steel was studied by SEM, TEM, phase analysis, tensile and impact tests. The results show that the tempering process can affect the mechanical properties of the tested steel by influencing the precipitates and dislocations. After tempering, the microstructure of the HT9 steel is lath martensite, and the precipitated phase is M₂₃C₆ carbide, and no other precipitated phase is observed. With the increase of tempering temperature, the matrix gradually recovers, the dislocation tangles are gradually normalized and thinned into dislocation networks, and forming subgrains. The M₂₃C₆ carbide undergoes Ostwald ripening, the precipitation strengthening and dislocation strengthening effects are weakened, the strength and hardness decrease, while the toughness increases. Tempered at 770 ℃ for 1-12 h, as the tempering time prolongs, the matrix gradually recovers and the M₂₃C₆ phase gradually ripens. The strength and hardness gradually decrease with a certain time dependence. According to the mechanical properties standards, the strength and toughness match well when the heat treatment system of the HT9 steel is quenching at 1040 ℃ for 1 h and tempering at 770 ℃ for 6 h.

Key words: HT9 steel, M₂₃C₆ phase, microstructure, mechanical properties, heat treatment process, dislocation

中图分类号:

谢谱, 赵吉庆, 颜廷亭. 回火工艺对HT9钢组织和力学性能的影响[J]. 金属热处理, 2024, 49(3): 44-49.

Xie Pu, Zhao Jiqing, Yan Tingting. Effect of tempering process on microstructure and properties of HT9 steel[J]. Heat Treatment of Metals, 2024, 49(3): 44-49.

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回火工艺对HT9钢组织和力学性能的影响

Effect of tempering process on microstructure and properties of HT9 steel

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