用高温拉伸试验评价HT690镍基合金焊条熔敷金属DDC敏感性  

Ductility dip cracking sensitivity of HT690 Ni-based alloy weld metal

作　　者：吴伟[1] 陈佩寅[1] 姜胡[1] 

机构地区：[1]机械科学研究院哈尔滨焊接研究所,150080

出　　处：《焊接》2009年第2期61-64,共4页Welding & Joining

摘　　要：DDC(Ductility Dip Cracking)是一种产生于奥氏体合金中的显微裂纹,其潜在危害性大。对四种HT690镍基合金焊条熔敷金属进行高温拉伸试验,得到高温塑性与温度的关系曲线,采用最低塑性值评价材料的DDC敏感性。最后,通过扫描电镜分析,得到了DDC裂纹的典型断口形貌。Ductility dip cracking (DDC) is a dangerous microcracking that occurs in the austenitic alloys.The tensile test at elevated temperature was carried out for four kinds of Inconel 690 electrode,and the coefficient curves of high temperature ductility and temperature was obtained. The minimum ductility was used to evaluate the DDC sensitivity of the material.At last,the results were verified by SEM test.

关 键 词：DDC HT690镍基合金焊条 高温拉伸试验 

分 类 号：TG422.1[金属学及工艺—焊接]