利用Thermo-Calc热力学软件计算了00Ni14Cr3Mo3Ti马氏体时效钢750～1050℃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 precipitated phases of 00Ni14Cr3Mo3Ti maraging steel at solution temperature 750-1 050 ℃ are studied by Thermo-Calc software, the undissolved Laves phase is discoveried at lower solution temperature, it has been dissolved at 805 ℃. The undissolved phase for 750 ℃ and 800 ℃ solid solution treatment is Laves by phase analysis, it isn't detected at 850 ℃. But a little Laves phase in matrix is detected for 850 ℃ solid solution treatment by SEM, the Laves phase has been dissolved for 900 ℃ solid solution treatment. Based on the calculated results, phase analysis and SEM morphologies of the steel, the best range of solution temperature is 850 - 950 ℃. The test results show that the undissolved Laves phase deteriorates impact toughness of steel at solution and aging treatment; the best combination of strength and toughness of maraging steel can be obtained for 900 ℃ solution treatment.
参考文献
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