摘要
本方采用示波冲击、俄歇分析、启裂源组织观察及热模拟实验,对Cr-Ni-Mo 70kg/mm^2手工多层焊缝中各种组织的形态及韧性进行了研究。其中韧性较低的是经850℃～1050℃再热后的重结晶及不完全重结晶组织,韧性最薄弱环节主要为具有黑色带状的重结晶组织,其构成为铁素体及带状分布的M-A组元或碳化物。薄弱环节数量越多韧性越低,整个焊缝的韧性越低;合金元素通过影响薄弱环节的韧性而影响整个焊缝的韧性。
By using the thermo-simulation, auger analysis,and Charpy V notch impact test and with observation of the microstructure where the cleavage crack initiated, the microstructure and toughness of each zone of Cr-Ni-Mo multipass weld metals have been investigated. The results indicates that the reheated zone heated over a peak temperature of 850℃ to 1050℃ has a lower toughness. The zone with the weakest toughness is mainly a recrystalization zone composed of ferrite and black stripe which are M-A constitutent and/or carbide. With statistical analysis, it has been revealed that the more the weakest zone and the lower its toughness, the lower the toughness of the entire weld metals. The alloy elements have a influence on the toughness of the weakest zone, thereby changing the toughness of weld metals.
出处
《甘肃工业大学学报》
1991年第3期28-33,共6页
Journal of Gansu University of Technology
关键词
焊缝
韧性
Cr-Ni-Mo系
高强钢
toughness, local brittle zone, statistical analysis, weld metals, microstructure
