Publication Date:
2012-10-04
Description:
The microstructure evolution of 25Cr-35Ni-1Mo radiant tubes was investigated after approximately two years of service in a continuous annealing furnace. The inner and outer tube walls were exposed to N 2 -containing combustion environment and protective atmosphere, respectively. The decarburization feature analysis indicated that carbon content decreased toward the tube surface. However, precipitates at the inner and outer walls were coarser, their content increased and the microhardness value also increased compared to that in the central area. X-ray diffraction illustrated that M 2 (C,N) and M 6 (C,N) were the dominant carbide at the inner and outer walls, and precipitates in the central area were mainly M 23 C 6 and M 6 (C,N) phases. The results were assumed to be associated with the nitridation phenomenon that occurred in the N 2 -containing environment at elevated temperatures. Content Type Journal Article Pages 1-7 DOI 10.1007/s11661-012-1302-6 Authors Zhichao Zhu, School of Material Science and Engineering, Dalian University of Technology, Dalian, 116085 People’s Republic of China Congqian Cheng, School of Material Science and Engineering, Dalian University of Technology, Dalian, 116085 People’s Republic of China Chunhui Liu, School of Material Science and Engineering, Dalian University of Technology, Dalian, 116085 People’s Republic of China Jie Zhao, School of Material Science and Engineering, Dalian University of Technology, Dalian, 116085 People’s Republic of China Journal Metallurgical and Materials Transactions A Online ISSN 1543-1940 Print ISSN 1073-5623
Electronic ISSN:
1543-1940
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
