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| 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 |
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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.
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Received: 29 March 2013
Published: 01 August 2014
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Corresponding Authors:
Bin WANG
E-mail: binking2012@foxmail.com
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2014, Vol. 21 
