Oxidation and internal nitridation behaviors of a Ni-based superalloy Rene 65 during high-temperature homogenization

作     者：Xian-guang Zhang Jia-jun Chen Yang Zhou Lang Shui Dong-ping Xiao Jian-hui Fu Wen-chao Yang Huan Liu Ying-jie Ren Peng Shi Jian Zhang Xian-guang Zhang;Jia-jun Chen;Yang Zhou;Lang Shui;Dong-ping Xiao;Jian-hui Fu;Wen-chao Yang;Huan Liu;Ying-jie Ren;Peng Shi;Jian Zhang

作者机构：State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing(USTB)Beijing 100083China School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing(USTB)Beijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Co.Ltd.Chengdu 610300SichuanChina Iron and State Key Laboratory of Metal Material for Marine Equipment and ApplicationAnshan 114009LiaoningChina Pangang Group Research Institute Co.Ltd.Panzhihua 617000SichuanChina 

出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)

年 卷 期：2023年第30卷第8期

页      面：1622-1632页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 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：supported by the Beijing Municipal Natural Science Foundation(No.2212041) National Natural Science Foundation of China(No.51804232) supported by the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(FRF-IDRY-20-020). 

主　　题：Nickel-based superalloy Homogenization Oxidation Kinetics Internal nitridation Thermodynamics 

摘      要：Homogenization heat treatment is a key process to remove the micro-segregation and re-dissolve the undesired phases for wrought superalloy.The oxidation behavior of the wrought superalloy during the high-temperature homogenization process,however,was rarely studied.The oxidation film evolution and growth kinetics of an as-cast superalloy Rene 65 during the homogenization were systematically studied.The oxide film consists of Cr_(2)O_(3) external oxidation layer and dendritic TiO_(2) and Al_(2)O_(3) internal oxidation layer.And the growth kinetics of the oxide film followed a parabolic law.Internal nitridation occurs during the oxidation process,and TiN is apparently formed at the tip of internal oxidation layer.The originally formed TiN can be transformed into TiO_(2) or retained with the progress of oxidation.Meanwhile,the TiN is newly formed in the deeper matrix at the new oxidation-layer tip.Thermodynamic analyses revealed that there is a competition between the oxidation and nitridation.Nitridation can occur when the partial pressure of nitrogen exceeds the threshold of nitridation and the critical partial pressure ratio of nitrogen and oxygen.