理化检验-物理分册2025，Vol.61Issue(7)：32-38,7.DOI:10.11973/lhjy-wl250078
1000MPa级超高强水电钢焊接热影响区组织及韧性
Microstructure and toughness of welding heat affected zone of 1 000 MPa grade ultra-high strength hydropower steel
熊俊珍 1王凤会 1董现春 1邹扬 2李睿昊 1牟淑坤1
作者信息
- 1. 首钢集团有限公司技术研究院,北京 100043
- 2. 首钢京唐钢铁联合有限责任公司,唐山 063200
- 折叠
摘要
Abstract
The microstructure and toughness of the heat affected zone of 1 000 MPa grade ultra-high strength hydropower steel were studied by Gleeble thermal simulation.The results show that the microstructure of the heat affected zone of 1 000 MPa grade ultra-high strength hydropower steel was mainly composed of martensite and bainite,and there were more small angle grain boundaries at peak temperatures of 1 320℃and 850℃.At peak temperatures of 1 320℃,the impact absorbed energy was only 35 J,the crack formation energy was 28 J,and the crack propagation energy was 7 J.The impact absorbed energy was mainly composed of crack formation energy.When the peak temperature was less than 1 100℃,and the impact absorbed energy was greater than 100 J.The impact absorbed energy was mainly composed of crack propagation energy.At the peak temperature of 1 320℃,the toughness of the material increased first and then decreased with the increase of t8/5.When t8/5 was more than 40 s,the carbon element diffused fully and the carbide particles aggregated and grew up,which promoted the formation and expansion of cracks.The coarse grain zone of the ultra-high strength hydropower steel joint was the weak area of the whole joint.The heat input of ultra-high strength hydropower steel was recommended to be 15-60 kJ/cm.关键词
1000MPa级超高强水电钢/焊接热影响区/显微组织/冲击韧性Key words
1 000 MPa grade ultra-high strength hydropower steel/welding heat affected zone/microstructure/impact toughness分类
通用工业技术引用本文复制引用
熊俊珍,王凤会,董现春,邹扬,李睿昊,牟淑坤..1000MPa级超高强水电钢焊接热影响区组织及韧性[J].理化检验-物理分册,2025,61(7):32-38,7.
