论文部分内容阅读
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α-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。
The phase precipitation law in 690 alloy has a direct impact on the grain boundary stress corrosion resistance. The effect of composition change and heat treatment temperature on the precipitation regularity of equilibrium phase of 690 alloy was simulated by Thermo-Calc software. The results showed that the content of C significantly affected the precipitation of M23C6, but had little effect on the phase of γ ’and α-Cr. The content of Cr had a significant effect on the precipitation of M23C6, γ’ and α-Cr. Precipitation law has little effect. From this conclusion: the alloy solution temperature should be above 1050 ℃, isothermal heat treatment temperature should be above 700 ℃.