Abstract
Abstract
617B alloy is one of the alternative materials for ultra-supercritical power generating units, its microstructure will change during service under extremely harsh conditions. The research of precipitation behavior of 617B superalloy and other similar nickel-based superalloy during aging is summarized. It is concluded that the main phases of 617B superalloy during aging include γ’ phase, μ phase and M23C6 carbide. The precipitation behavior of the three phases is affected by aging temperature and aging time. The microstructure of materials has a direct influence on the properties of materials. Therefore, in the aging process of 617B superalloy, the creep property of the alloy will be affected by these phases. This paper summarizes the effect of these phases on the creep behavior of 617B superalloy. It is found that γ’ phase has a positive effect on the creep behavior of 617B superalloy, while μ phase has a negative effect. M23C6 has two-sided effects depending on its size.
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