晶界工程处理对Incoloy825合金耐晶间腐蚀性能的影响  

Effect of Grain Boundary Engineering on Intergranular Corrosion Resistance of Incoloy825 Alloy

作　　者：白琴[1] 边璐[1] 赵清[1] 王宝顺 杨晨 夏爽[1] 周邦新[1] BAI Qin;BIAN Lu;ZHAO Qing;WANG Baoshun;YANG Chen;XIA Shuang;ZHOU Bangxin(School of Material Science and Engineering,Shanghai University,Shanghai 200072,China;Zhejiang Jiuli Hi-Tech Metals Co.,Ltd.,Huzhou 313028,China)

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]浙江久立特材科技股份有限公司,湖州313028

出　　处：《腐蚀与防护》2019年第10期705-709,共5页Corrosion & Protection

基　　金：国家自然科学基金项目(51671122;51871144)

摘　　要：通过生产用冷拔机对镍基合金管材Incoloy825进行冷拔后退火的晶界工程(GBE)处理,采用晶间腐蚀试验研究了晶界工程处理对Incoloy825合金耐晶间腐蚀性能的影响。结果表明:使用工厂生产设备GBE处理后,能够使Incoloy825合金中的低∑CSL晶界(晶界两侧晶粒重合位置点阵密度的倒数不超过29)比例提高到75%以上,并显著改善其耐晶间腐蚀性能;GBE处理后Incoloy825合金中形成的大量相互连接的∑3-∑3-∑9和∑3-∑9-∑27等∑3^n类型三叉晶界是其耐晶间腐蚀性能提高的主要原因。Grain boundary engineering(GBE)was carried out on nickle-based alloy tube material Incoloy825 by cold drawing using a draw-bench for factory production and subsequent annealing.The intergranular corrosion(IGC)testing was performed to study the effect of GBE on the IGC resistance of Incoloy825 alloy.The results show that the proportion of low∑CSL(the reciprocal of the coincidence site lattice density for grains on both sides of grain boundary no higher than 29)grain boundaries in Incoloy825 alloy could be enhanced to more than 75%,so the IGC resistance of Incoloy825 alloy improved greatly.The enhancement of IGC resistance of Incoloy825 alloy after GBE was attributed to the formation of many inter-connected∑3^ n-type triple junctions,such as∑3-∑3-∑9 and∑3-∑9-∑27.

关 键 词：晶界工程(GBE) 晶间腐蚀 重合位置点阵(CSL)晶界 形变 热处理 

分 类 号：TG174.2[金属学及工艺—金属表面处理]