Effects of Isothermal Aging on Microstructure and Mechanical Property of Low-Carbon RAFM Steel

被引:18
|
作者
Chen, Jian-Guo [1 ,2 ]
Liu, Chen-Xi [1 ]
Wei, Chen [2 ]
Liu, Yong-Chang [1 ]
Li, Hui-Jun [1 ]
机构
[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300350, Peoples R China
[2] Tianjin Special Equipment Inspect Inst, Tianjin 300192, Peoples R China
基金
中国国家自然科学基金;
关键词
Low-carbon RAFM steel; Isothermal aging; Microstructure evolution; Mechanical property; REDUCED-ACTIVATION STEELS; HIGH-TEMPERATURE CREEP; LAVES PHASE; PRECIPITATION BEHAVIOR; AUSTENITIC STEEL; STAINLESS-STEEL; TERM CREEP; EVOLUTION; STRENGTH; TANTALUM;
D O I
10.1007/s40195-019-00883-6
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
In order to investigate the microstructure and mechanical property evolution of low-carbon reduced activation ferritic/martensitic (RAFM) steel during isothermal aging, the normalized and tempered specimens were aged at 600 degrees C for 500, 1000, and 3000h, respectively. The microstructural evolution with aging time was analyzed, including the precipitation and growth of M23C6 and MX-type carbides as well as the formation of Laves phase. The results indicate that the coarsening of M23C6 is more obvious than that of MX with increase in aging time. During the long-term thermal exposure, the Fe2W Laves phase precipitates adjacent to M23C6 along the prior austenite grain boundaries and packet boundaries. Lower carbon content can delay the precipitation of Laves phase compared to the steel containing higher carbon. In addition, the Laves phase precipitated along boundaries can provide the precipitation strengthening, slightly increasing the tensile strength of low-carbon RAFM steel after aging for 3000h.
引用
收藏
页码:1151 / 1160
页数:10
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