摘要
在焊接速度为100 mm/min,搅拌头转速分别为300、400和500 r/min的工艺参数下,对2707超级双相不锈钢进行了搅拌摩擦焊试验,利用扫描电镜的背散射电子成像和EBSD技术对接头焊缝区的微观组织进行了分析。结果表明,转速为300 r/min时,焊缝区铁素体相首先发生动态再结晶,奥氏体相未观察到明显的再结晶;转速为400 r/min时,奥氏体相开始出现动态再结晶。随着转速的增加,铁素体相和奥氏体相都发生了动态再结晶,小角度晶界比例逐渐减小,大角度晶界比例逐渐增加。不同焊接工艺参数下焊缝区两相的晶粒尺寸均小于母材的晶粒尺寸。
The friction stir welding of 2707 hyper duplex stainless steel was performed under the welding speed of 100 mm/min and stirring tool rotational speeds of 300, 400 and 500 r/min respectively. The microstructure in weld zone of the joints was studied by using the back scattered electron imaging and EBSD technology of scanning electron microscope（SEM）.The results show that when the rotational speed is 300 r/min, dynamic recrystallization of ferrite phase in weld zone firstly occurs, and no obvious recrystallization is observed in austenite phase. When the rotational speed is 400 r/min, dynamic recrystallization of austenite phase begins to appear. With the increase of rotational speed, dynamic recrystallization of both the ferrite phase and austenite phase occurs, the proportion of low angle grain boundaries decreases gradually and the proportion of high angle grain boundaries increases gradually. The grain size of the two phases in weld zone under different welding parameters are smaller than that of base metal.
作者
李建春
李国平
梁伟
韩培德
LI Jianchun1,2, LI Guoping2, LIANG Wei1, HAN Peide1(1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第3期23-27,共5页
Hot Working Technology
基金
国家重点研发计划项目(2016YFB0300201)
山西省重点研发计划国际合作项目(201603D421026)
关键词
超级双相不锈钢
搅拌摩擦焊
微观组织
再结晶
hyper duplex stainless steel
fiiction stir welding
microstructure
recrystallization
