连接条件对00Cr25Ni7Mo3N双相不锈钢扩散连接的影响

利用热模拟试验机并结合扫描电镜(SEM)对00Cr25Ni7Mo3N超级双相不锈钢的超塑扩散连接进行实验研究,对不同连接条件下的孔洞形貌、界面组织进行相应的分析。研究结果表明,超塑性扩散连接试样的界面结合强度随扩散连接压力的增大、表面质量的提高及连接时间的延长而增大。扩散连接在连接温度1100℃时,连接压力为10MPa～20MPa;待连接表面经精磨处理后,连接时间10min～20min的条件下,可实现焊合率为96%～98%的扩散连接,且连接试样的初始连接界面消失,界面孔洞基本闭合,界面剪切结合强度达到407MPa～413MPa。

Effect of the bonding conditions on the super plastic diffusion bonding of 00Cr25Ni7Mo3N duplex stainless steel

The research of super plastic diffusion bonding behavior of 00Cr25Ni7Mo3N duplex stainless steel was performed on hot simulator.The microstructure of the bonding interface was studied by scanning electron microscope(SEM).The mechanical property of the joint was determined by shear strength tests.The results indicate that the strength of joint can be improved with increasing bonding pressure,improving surface quality and prolonging holding time.During hot plastic deformation at 1100℃ under 10MPa~20MPa for 10min~20min,the initial bonding boundary would disappear and the voids would be closed,the grain would grew up across the interface due to atom diffusion and interface migration,and the strength of joints would be as high as 413MPa.