690合金中的相析出规律直接影响着其晶界应力腐蚀抗力.应用Thermo-Calc软件模拟计算了690合金的成分变化和热处理温度对平衡相析出规律的影响.结果表明:C含量明显影响M23C6的析出规律,而对γ＇和α-Cr相的影响较小；Cr含量对M23C6、γ＇和a-Cr相的析出规律都有明显影响；Fe含量对相析出规律影响很小.由此得出结论:合金固溶温度应在1050℃以上,等温热处理温度应在700℃以上.
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