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利用Thermo-Calc热力学软件计算了00Ni14Cr3Mo3Ti马氏体时效钢750~1 050℃固溶温度下析出相的变化,发现低温固溶时有未溶的Laves相,该相在805℃完全溶解。物理化学相分析验证在750℃、800℃固溶处理时未溶相为Laves相,850℃时未检测到。但通过SEM组织分析,固溶温度为850℃,基体中还有少量未溶的Laves相,900℃完全溶解。根据计算结果、相分析和固溶态SEM组织优化最佳固溶温度在850~950℃范围内。试验结果表明,未溶的Laves相降低了钢固溶、时效态冲击韧性;固溶温度为900℃时,时效后钢的强韧性配比最佳。
The change of precipitation phase of 00Ni14Cr3Mo3Ti maraging steel at solution temperature of 750-10000 ℃ was calculated by Thermo-Calc thermodynamic software. It was found that there was an undissolved Laves phase at low temperature, which was completely dissolved at 805 ℃. Physical and chemical phase analysis proved that the undissolved phase was Laves phase at 750 ℃ and solution treatment at 800 ℃, but not detected at 850 ℃. However, through SEM analysis, the solution temperature is 850 ℃. There is also a small amount of undissolved Laves phase in the matrix, which is completely dissolved at 900 ℃. According to the calculation results, the optimal solution temperature for phase analysis and solution microstructure SEM is 850 ~ 950 ℃. The results show that the undissolved Laves phase reduces the solid solution and aging impact toughness. When the solution temperature is 900 ℃, the toughness ratio of the steel is the best.