形变热处理调控哈氏合金C276的晶界特征分布  

Grain boundary character distribution of hastelloy C276 modified by thermo-mechanical processing

作　　者：马朝阳 张晓峰 刘廷光 杨光昌 MA Chaoyang;ZHANG Xiaofeng;LIU Tingguang;YANG Guangchang(National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China;Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《金属加工(热加工)》2025年第2期105-111,共7页MW Metal Forming

基　　金：中央高校基本科研业务费专项资金-北京科技大学青年教师学科交叉研究项目(FRF-IDRY-22-015)资助。

摘　　要：哈氏合金C276为层错能较低的面心立方金属材料,适用于晶界工程技术,有可能通过控制晶界网络结构来进一步提高其抗晶间腐蚀性能。基于晶界工程技术理念,研究了通过形变热处理(TMP)来调控哈氏合金C276的晶界特征分布的工艺方法。结果显示:经过3%~7%冷轧和1150℃保温10min处理后,C276合金中的低ΣCSL晶界比例达到70%以上,其中主要是Σ3晶界(孪晶界),形成了“由互为Σ3n取向关系的晶粒”构成的大尺寸的晶粒团簇,平均晶粒团簇尺寸达到110μm以上,获得了较好的晶界工程处理效果。Hastelloy C276 is a face-centered cubic metal material with low stacking fault energy,which is suitable for grain boundary engineering.It is possible to further improve its intergranular corrosion resistance by controlling the grain boundary network structure.Based on the concept of grain boundary engineering,this paper studies the procedure of thermo-mechanical processing(TMP)to control the grain boundary characteristic distribution of Hastelloy C276.The results show that after 3%~7% cold rolling and 1150℃ holding for 10min,the proportion of low-ΣCSL grain boundaries in the C276 alloy reaches more than 70%.The Σ3 boundaries(twin boundaries)occupy most of the CSL boundaries,resulting in the formation of large grain-clusters which are composed of grains with mutual Σ3n orientation relationship.The average grain cluster size reaches more than 110μm,and a good grain boundary engineering treatment effect is obtained.

关 键 词：哈氏合金C276 形变热处理 重位点阵晶界 Σ3晶界 晶粒团簇 

分 类 号：TG1[金属学及工艺—金属学]