617合金是700℃以上超超临界燃煤电站的备选材料,具有优越的高温持久和耐氧化性能.本文利用热力学计算软件Thermo-Calc及相应的Ni基数据库,对617合金的平衡析出相规律进行了计算分析.结果表明,该合金主要平衡析出相包括y’、σ、μ相以及碳化物M6C和M23C6,Ti对y’相析出量的影响比Al更显著.对617合金标准热处理态的微观组织观察显示,组织均匀,晶界上有连续片状碳化物,再经1180℃/1 h固溶处理后,碳化物部分回溶,在晶界上呈颗粒状分布.
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