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 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing(USTB),Beijing 100083,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing(USTB),Beijing 100083,China [3]Chengdu Advanced Metal Materials Industrial Technology Institute Co.,Ltd.,Chengdu 610300,Sichuan,China [4]Iron and State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,Liaoning,China [5]Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China

出　　处：《Journal of Iron and Steel Research International》2023年第8期1622-1632,共11页

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).

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.

关 键 词：Nickel-based superalloy HOMOGENIZATION OXIDATION Kinetics Internal nitridation THERMODYNAMICS 

分 类 号：TG132.3[一般工业技术—材料科学与工程]