Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature
Bin WANG1,2,Zheng-dong LIU1,Shi-chang CHENG1,Chun-ming LIU1,Jing-zhong WANG1
1. Institute of Structural Materials, China Iron and Steel Research Institute Group, Beijing 100081, China 2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China
Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature
Bin WANG1,2,Zheng-dong LIU1,Shi-chang CHENG1,Chun-ming LIU1,Jing-zhong WANG1
1. Institute of Structural Materials, China Iron and Steel Research Institute Group, Beijing 100081, China 2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China
ժҪ Microstructure evolution and the changes in mechanical properties of HR3C steel during long-term aging at 650, 700 and 750 �� were investigated. The precipitated phases of the aging steel included M23C6 carbides, Z-phase and a trace amount of Nb(C,N). The M23C6 carbides were distributed mainly at the grain boundary, while Z-phase was mainly inside the grains. Amounts of both M23C6 carbides and Z-phase during the aging process increased with increasing aging period and temperature. Coarsening of M23C6 carbides was influenced significantly by aging time and temperature, while the size of the Z-phase was relatively less affected by the aging time and temperature, which had a steady strengthening effect. Coarsening of the M23C6 carbides was the main reason for the decline in high temperature yield strength during long-term aging at 750 ��. The M23C6 carbides were linked into a continuous chain along the grain boundary which accounted for the decrease of toughness during aging.
Abstract��Microstructure evolution and the changes in mechanical properties of HR3C steel during long-term aging at 650, 700 and 750 �� were investigated. The precipitated phases of the aging steel included M23C6 carbides, Z-phase and a trace amount of Nb(C,N). The M23C6 carbides were distributed mainly at the grain boundary, while Z-phase was mainly inside the grains. Amounts of both M23C6 carbides and Z-phase during the aging process increased with increasing aging period and temperature. Coarsening of M23C6 carbides was influenced significantly by aging time and temperature, while the size of the Z-phase was relatively less affected by the aging time and temperature, which had a steady strengthening effect. Coarsening of the M23C6 carbides was the main reason for the decline in high temperature yield strength during long-term aging at 750 ��. The M23C6 carbides were linked into a continuous chain along the grain boundary which accounted for the decrease of toughness during aging.
��������:National Natural Science Foundation of China
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E-mail: binking2012@foxmail.com
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Bin WANG,,Zheng-dong LIU,Shi-chang CHENG,Chun-ming LIU,Jing-zhong WANG. Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature[J]. �й������ڿ���, 2014, 21(8): 765-773.
Bin WANG,,Zheng-dong LIU,Shi-chang CHENG,Chun-ming LIU,Jing-zhong WANG. Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature. Chinese Journal of Iron and Steel, 2014, 21(8): 765-773.