Solidification behavior of Re-and Ru-containing Ni-based single-crystal superalloys with thermal and metallographic analysis

作     者：Gang Liu Lin Liu Zhen-Hua Han Guo-Jun Zhang Jun Zhang 

作者机构：School of Materials Science and Engineering Xi'an University of Technology Xi'an 710048 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第10期

页      面：792-798页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National High Technology Research and Development Program of China (No. 2012AA03A511) the National Natural Science Foundation of China (Nos. 51171151 and 51331005) the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University (No. SKLSP201310) the Science and Technology Program of Shaanxi Province(No.2013JQ6003) the Research Foundation of Education Bureau of Shaanxi Province (No. 2013JK0898) 

主　　题：Ni-based single-crystal alloys Solidification behavior Metallography Thermal analysis 

摘      要：To clarify the solidification behavior of Re- and Ru-containing Ni-based single-crystal superalloys, four experimental alloys with varied contents of Re and Ru were investigated by differential scanning calorimetry （DSC） and metallographic techniques. To obtain the - solvus temperatures, the stepwise solution and aging heat treatments were used. DSC analysis shows that Re leads to the increase in freezing range and γ-solvus temperature. On the contrast, Ru only has negligible influence on the freezing range, but leads to the lower γ-solvus temperature. In comparison with Ru, Re leads to more severe segregation and higher eutectic fractions in as-cast microstructures. Furthermore, the castability and phase stability of Ni-based superalloys were analyzed by the results of DSC and metallographic analysis, such as freezing range, critical nucleation temperature, γ-solvus temperature and eutectic fractions. It shows that Re leads to the wider freezing range and lower critical nucleation temperature, indicating the worse castability of Re-con- taining Ni-based single-crystal superalloys.