Thermodynamics analysis and precipitation behavior of fine carbide in K416B Ni-based superalloy with high W content during creep  

高钨K416B镍基合金蠕变期间细小碳化物析出行为及热力学分析（英文）

作　　者：谢君[1] 于金江[1] 孙晓峰[1] 金涛[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第5期1478-1483,共6页中国有色金属学报（英文版）

基　　金：Projects(2010CB631200,2010CB631206)supported by the National Basic Research Program of China;Project(50931004)supported by the National Natural Science Foundation of China

摘　　要：The precipitation behavior of carbide in K416 B superalloy was investigated by means of creep measurement and microstructure observation. The results show that nanometer M6 C particles discontinuously precipitate in the γ matrix or along the γ/γ′ interface of the alloy during high temperature tensile creep. Thereinto, the amount of fine M6 C carbide increases as creep goes on, and the coherent interfaces of M6 C phase precipitating from the γ matrix are {100} and {111} planes. The thermodynamics analysis indicates that the solubility of element carbon in the matrix decreases when the alloy is deformed by the axial tensile stress during creep, so as to cause the carbon segregating in the regions of stress concentration and combining with carbide-forming elements M（W, Co）, which promotes the fine M6 C carbide to precipitate from the γ matrix.通过蠕变测试和组织形貌观察,研究K416B合金中细小碳化物的析出行为。结果表明:在高温蠕变期间,纳米级M6C碳化物沿基体内和γ/γ′界面不连续析出,其中,随着蠕变进行,细小M6C碳化物析出数量逐渐增多,且粒状M6C相自γ基体析出的共格界面为{100}和{111}晶面。热力学分析表明:在蠕变过程中,合金在轴向拉伸应力下变形时,元素C在基体中的溶解度减小,并在应力集中处偏聚,与W、Co等碳化物形成元素结合,促使细小M6C碳化物从γ基体中析出。

关 键 词：K416B Ni-based superalloy M6C carbide stress inducement thermodynamics analysis 

分 类 号：TG146.15[一般工业技术—材料科学与工程]