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根据对700℃级超超临界电站关键部件材料性能的要求,通过材料热力学模拟软件JMatPro8.0及相应的镍基高温合金数据库,研究了6种现有的700℃级电站关键部件高温合金的平衡相与高温力学性能,并对比分析了3种新设计的镍铁基合金性能。结果表明:IN740H合金的平衡相和高温力学性能最优;CCA617合金持久强度不能满足要求;IN706、TOS1X、USC141和GH2984合金的热力学平衡相中均有TCP相析出,组织稳定性较差;新设计的镍铁基合金性能满足要求,组织稳定性好,且镍铁基合金中大量Fe元素取代了Ni、Co,进一步降低了合金成本。
According to the requirements of the material properties of key components of 700 ℃ ultra-supercritical power plant, the balance of the superalloys of the key components of the 6 existing 700 ℃ power plants was studied through the material thermodynamic simulation software JMatPro8.0 and the corresponding nickel base superalloy database Phase and high temperature mechanical properties, and compared the performance of three newly designed nickel-iron based alloys. The results show that IN740H alloy has the best mechanical properties at equilibrium phase and high temperature, the long-term strength of CCA617 alloy can not meet the requirement, and the TCP phase precipitates in both IN706, TOS1X, USC141 and GH2984 alloys. Nickel-iron-based alloy to meet the performance requirements, good tissue stability, and a large number of nickel-iron-based alloys replaced Fe, Ni, Co, further reducing the cost of the alloy.