焊后热处理对07MnCrMoVR钢热影响粗晶区-20℃冲击韧性的影响

特殊钢 ›› 2020, Vol. 41 ›› Issue (6): 68-71.

焊后热处理对07MnCrMoVR钢热影响粗晶区-20℃冲击韧性的影响

冯路路^1,2, 乔文玮³, 鲁修宇⁴, 周峰⁵

1荆楚理工学院机械工程学院，荆门448000；
2武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心，武汉430081 ；
3江苏华能电缆股份有限公司，高邮225613 ；
4武汉钢铁(集团)研究院，武汉430080；
5佛山职业技术学院机电工程学院，佛山528137)

收稿日期:2020-05-30 出版日期:2020-12-01 发布日期:2022-05-09
作者简介:冯路路(1982-),男，硕士(2008年东北大学)，高级工程师， 2005年沈阳理工大学(本科)毕业，高性能金属材料及强韧化研究。
基金资助:
荆楚理工学院校级科学研究项目(PY202004, YB201902)

Effect of Post-Weld Heat Treatment on -20℃ Impact Toughness of Heat Affected Coarse Grain Zone of Steel 07MnCrMoVR

Feng Lulu^1,2, Qiao Wenwei³ ,Lu Xiuyu⁴ ， Zhou Feng⁵

1 School of Mechanical Engineering, Jing Chu University of Technology, Jingmen 448000 ；
2 Collaborative Innovation Center on Advanced Steels,Wuhan University of Science and Technology, Wuhan 430081 ；
3 Jiangsu Huaneng Cable Co Ltd. Gaoyou 225613 ；
4 Research Institute of Wuhan Iron & Steel Group, Wuhan 430080；
5 School of Mechanical and Electrical Engineering, Foshan Polytechnic, Foshan 528137

Received:2020-05-30 Published:2020-12-01 Online:2022-05-09

摘要/Abstract

摘要： 采用光学显微镜、扫描显微镜、透射电镜和冲击韧性试验机对07MnCrMoVR钢热影响粗晶区在460～660℃ 2h焊后热处理工艺下的组织性能进行了分析。结果表明,随着焊后热处理温度的升高,焊缝热影响粗晶区-20℃冲击韧性呈现先降低再升高的现象。焊后热处理钢在580℃和620℃出现再热裂纹倾向,冲击试样为脆性断口,解理断裂,沿着晶界出现了微裂纹,主要是因为碳化物沿着晶界析出并长大弱化了晶界的结合能,导致低温冲击韧性出现降低。≥620℃焊后热处理,07MnCrMoVR钢出现再结晶的现象,位错消失,铁素体晶粒合并长大使其低温冲击韧性又重新升高。该钢最优焊后热处理为460～500℃ 2 h。

Abstract: The microstructure and properties of the heat affected coarse grain zone of steel 07MnCrMoVR with post¬weld heat treated at 460 ~ 660 °C for 2 h are analyzed by means of optical microscope, scanning microscope, transmission electron microscope and impact toughness tester. The results show that with increase of post-weld heat treatment temperature, the - 20 °C impact toughness of post-weld heat affected coarse-grained zone decreases firstly and then increases. The steel with post-weld heat treatment between 580 °C. to 620 ℃ can occur reheat cracks tend, the impact specimen is brittle fracture ,cleavage fracture and microcracks along grain boundary ,the main reason is that the carbide precipitates along the grain boundary and grows up to weaken binding energy of the grain boundary, which leads to the decrease of the impact toughness at low temperature. With post-weld heat treated ≥620°C , recrystallization occurs in 07MnCrMoVR steel, dislocation disappears ,and the low temperature impact toughness of the steel increases again due to the combined growth of ferrite grains. The optimum post-weld heat treatment of steel is 460 ~ 500°C X 2 h.

冯路路, 乔文玮, 鲁修宇, 周峰. 焊后热处理对07MnCrMoVR钢热影响粗晶区-20℃冲击韧性的影响[J]. 特殊钢, 2020, 41(6): 68-71.

Feng Lulu, Qiao Wenwei , Lu Xiuyu , Zhou Feng. Effect of Post-Weld Heat Treatment on -20℃ Impact Toughness of Heat Affected Coarse Grain Zone of Steel 07MnCrMoVR[J]. Special Steel, 2020, 41(6): 68-71.

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