摘要
采用纳米显微力学探针 (NanoIndenterII)及透射电子显微镜 ,对使用不同时间的低合金耐热钢(12Cr1MoV)电厂主蒸汽管道的组织及性能进行分析研究。结果表明 :随着运行时间的延长 ,细小碳化物颗粒不断在铁素体基体中析出 ,使基体强化 ,管样显微硬度提高 ;但在晶界出现聚集长大的碳化物。若运行时间过长 ,最终可能因晶界碳化物的粗大而产生沿晶断裂。本文分析的已使用 30× 10 4 h的主蒸汽管道仍能继续运行使用。
The structure and property of main steam pipes(12Cr1MoV)after different operating time in power plants were studied by Nano Indenter II and TEM. The results show that under the high temperature and stress,the fine carbide particles still precipitate in the ferritic matrix of the pipes with increasing operation time, so strengthen the matrix and increase the micro hardness of pipes. However, there are the gathering and growing of carbideds at the gain boundary, the cracks will form at the gain boundary. These results are necessary to further use of the pipes. Because the carbideds at the grain boundary will grow up and form cavity,the grain boundary areas will become weak. The main steam pipe after operating for 300000 hours studied in this paper can still be used.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2002年第2期62-64,共3页
Transactions of Materials and Heat Treatment
关键词
主蒸汽管
基体
组织
显微力学性能
main steam pipe
matrix
structure
micro mechanical property
