Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第5期    总第170期    2013年5月

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文章编号:1004-0609(2013)05-1269-06
晶界滑移对镍基合金失延开裂的影响
崔 巍,陈静青,陆 皓,陈俊梅

(上海交通大学 材料科学与工程学院,上海 200240)

摘 要: 为了研究镍基合金焊材FM-52M的高温失延裂纹(DDC),采用改进的应变-裂纹(STF)实验方法,提出新的裂纹敏感性判据——晶界滑移量。并将之与裂纹数量相结合定量评估不同温度、不同变形量条件下材料的DDC敏感性。结果表明:本研究中所得到的材料临界变形量6%大于传统STF方法得到的4%的临界变形量。预热处理、峰值温度、变形速率等条件都能显著影响DDC的敏感性。此外,利用显微硬度标记了许多微区,并对实验前后的微区进行了SEM观察,探讨晶界滑移与析出物在DDC的萌生与扩展过程中的作用。

 

关键字: 晶界滑移;高温失延裂纹;镍基合金

Influence of grain boundary sliding on ductility-dip cracking of Ni-based alloy
CUI Wei, CHEN Jing-qing, LU Hao, CHEN Jun-mei

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract:According to the improved strain-to-fracture test (STF) method, the value of grain boundary sliding was used as a new criterion to evaluate the susceptibility of ductility-dip cracking (DDC) in Ni-based alloy filler metal 52M(FM-52M) under various temperature and deformation conditions. The results show that the threshold strain of the test is 6%, which is larger than 4% obtained by previous STF method. Heat pretreatment, peak temperature, strain rate all have a great influence on the DDC susceptibility. Microhardness was used to mark interested micro-regions, from which SEM images were made before and after the test in order to explain the roles of grain boundary sliding and precipitates in DDC.

 

Key words: grain boundary sliding; ductility-dip cracking; Ni-based alloy

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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