期刊
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
卷 21, 期 8, 页码 765-773出版社
JOURNAL IRON STEEL RESEARCH EDITORIAL BOARD
DOI: 10.1016/S1006-706X(14)60139-4
关键词
HR3C steel; microstructure evolution; mechanical property; aging
资金
- National High-Tech Research and Development Program (863 Program) of China [2012AA03A501]
- International Science and Technology Cooperation Program of China [2012DFG51670]
Microstructure evolution and the changes in mechanical properties of HR3C steel during long-term aging at 650, 700 and 750 degrees C 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 degrees C. 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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