Microstructure evolution of CLAM steel during creep at 923K

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Ye, S.^1,2 ; Zhao, F.^1,2 ; Huang, F.^1,2 ; He, J.^1,2 ; Wang, J.L.^1,2

College of Materials and Metallurgy, Guizhou University, Guiyang, Guizhou

550025, China^1

Key Laboratory of Guizhou for Mechanical Behavior and Microstructure of Materials, Guiyang, Guizhou

550025, China^2

关键词: Creep performance;    Creep properties;    Dislocation structures;    Dissolution temperature;    High temperature creep;    Martensite laths;    Micro-structure evolutions;    Microstructure changes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012041/pdf
DOI  :  10.1088/1755-1315/81/1/012041

来源: IOP

【 摘 要 】

The microstructure change of CLAM steel during creep testing process was investigated at the temperature of 923K with different stress. The results show that the fragmentation and polygonization of martensite lath, as well as the degeneration of dislocation structure are the main factors to deteriorate the creep performance. The stability of MX precipitates in CLAM steel during high temperature creep is good, but the amount and size of M23C6 precipitates are increased. The Laves phase was not found in all samples, which may be due to the experimental temperature is close to the dissolution temperature of Laves phase. The higher temperature accelerates the microstructure evolution of CLAM steel, which results in the degradation of creep properties.