690合金原始晶粒尺寸对晶界工程处理后晶界网络的影响  

EFFECT OF ORIGINAL GRAIN SIZE ON THE BOUNDARY NETWORK IN ALLOY 690 TREATED BY GRAIN BOUNDARY ENGINEERING

作　　者：刘廷光[1] 夏爽[1] 李慧[1] 周邦新[1] 陈文觉[1] 

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《金属学报》2011年第7期859-864,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50974148;国家重点基础研究发展计划项目2011CB610502;上海市重点学科建设项目S30107资助~~

摘　　要：利用电子背散射衍射(EBSD)和取向成像显微分析技术(OIM)研究了690合金原始晶粒尺寸对晶界工程(GBE)处理后晶界特征分布(GBCD)的影响.结果表明,原始晶粒尺寸对GBE处理提高低∑CSL晶界比例及控制晶界网络分布有明显的影响.在最终退火工艺相同时,根据不同的原始晶粒尺寸,在GBE处理中需要采用不同的冷变形量,才能够获得最佳的晶界网络分布.可以利用参数"晶粒平均应变量"来表达原始晶粒尺寸和冷变形量共同影响GBE处理效果的综合作用.Effect of original grain size on the grain boundary character distribution （GBCD） in alloy 690 after treatment by grain boundary engineering （GBE） was studied using electron backscatter diffraction （EBSD） and orientation image microscopy （OIM）. The proportion of Iow-ZCSL grain boundary and grain boundary network after GBE are obviously influenced by the original grain size. Optimized GBE grain boundary network after the same annealing process can be obtained by altering the cold work degree based on the original grain size. Thus the microstructure after GBE is influenced by the combined effect of original grain size and deformation amount before annealing. Mean strain of grain is used to express the combined effect. A proper value of mean strain of grain is necessary to achieve the desired GBE grain boundary network.

关 键 词：镍基690合金 晶界工程 晶粒尺寸 ∑CSL晶界 晶界网络 

分 类 号：TG111[金属学及工艺—物理冶金]