E级钢调质处理后的组织与性能

doi:10.13251/j.issn.0254-6051.2022.07.030

金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 168-176.DOI: 10.13251/j.issn.0254-6051.2022.07.030

E级钢调质处理后的组织与性能

王皓¹, 田长亮¹, 王安¹, 贺建超², 覃作祥³

1.中车齐齐哈尔车辆有限公司, 黑龙江齐齐哈尔 161002;
2.哈尔滨工业大学(深圳)特殊环境物质科学研究院, 广东深圳 518055;
3.大连交通大学材料科学与工程学院, 辽宁大连 116028

收稿日期:2022-04-13 修回日期:2022-05-27 出版日期:2022-07-25 发布日期:2022-08-12
作者简介:王皓(1984—),男,高级工程师,硕士,主要研究方向为铁路货车关键零部件材料及热处理工艺,E-mail:15946494707@139.com

Microstructure and properties of grade E steel after quenching and tempering treatment

Wang Hao¹, Tian Changliang¹, Wang An¹, He Jianchao², Qin Zuoxiang³

1. CRRC Qiqihar Rolling Stock Co., Ltd., Qiqihar Heilongjiang 161002, China;
2. Institute of Special Environment Physical Science, Harbin Institute of Technology, Shenzhen Guangdong 518055, China;
3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian Liaoning 116028, China

Received:2022-04-13 Revised:2022-05-27 Online:2022-07-25 Published:2022-08-12

摘要/Abstract

摘要： 通过优化E级钢的调质热处理工艺,找到该钢调质后低温冲击性能提高的内在原因。并用光学显微镜对钢的显微组织进行分析,用拉伸试验机对经不同热处理后E级钢试件的拉伸性能和-40 ℃冲击性能进行检测。结果表明,在910 ℃淬火回火后,得到均匀的索氏体组织,冲击性能最佳。通过对冲击断口的观察和钢中碳化物析出行为的研究,指出E级钢调质处理后的韧性与碳化物的形貌与分布有关,低于550 ℃回火时,钢中的碳化物主要在板条边界和晶界析出,低温冲击性能低;高于550 ℃回火时,碳化物主要在晶内析出,呈粗粒状,且铁素体呈等轴状,冲击性能较高。

关键词: E级钢, 调质处理, 车钩, 冲击性能

Abstract: Through the optimization of quenching and tempering heat treatment process of grade E steel, the internal reason for the increase of low temperature impact properties was obtained. The microstructure of the steel was studied by optical microscope, and the tensile properties and -40 ℃ impact properties of grade E steel after different heat treatments were studied by tensile testing machine. The results show that uniform sorbite structure is obtained after quenching at 910 ℃ and tempering, and the impact properties is the best. Through the observation of the impact fracture and the study of the precipitation behavior of carbides in steel, the results show that the toughness of the grade E steel quenched and tempered is related to the morphology and distribution of carbides. When tempering temperature is below 550 ℃, carbides mainly precipitate at lath boundary and grain boundary, the impact properties of low temperature is low. When tempering temperature is above 550 ℃, carbides mainly precipitate in the grain and are coarse grained and the ferrite is equiaxed, the impact properties is high.

Key words: E steel, quenching and tempering treatment, couplers, impact properties

中图分类号:

U671.6

王皓, 田长亮, 王安, 贺建超, 覃作祥. E级钢调质处理后的组织与性能[J]. 金属热处理, 2022, 47(7): 168-176.

Wang Hao, Tian Changliang, Wang An, He Jianchao, Qin Zuoxiang. Microstructure and properties of grade E steel after quenching and tempering treatment[J]. Heat Treatment of Metals, 2022, 47(7): 168-176.

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E级钢调质处理后的组织与性能

Microstructure and properties of grade E steel after quenching and tempering treatment

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