通过定量金相、SEM & EDS、TEM等实验技术分析316L奥氏体不锈钢中析出相随时效时间、温度的变化, 并测定析出相的体积分数与尺寸. 结合热力学计算表明: 在316L奥氏体不锈钢中, 经850℃时效处理后, 析出相为M23C6型碳化物, 且随着时效时间的延长, 析出量明显增多, 尺寸增大; 经650℃时效处理100 h后, 主要析出相类型为χ相.
The effects of the aging temperature and time on precipitation behavior of 316L austenitic stainless steel were analyzed, and the volume fraction and the sizes of the precipitates were determined. By the thermodynamic calculation with the update database, the results show that the precipitated phase in 316L austenitic stainless steel was M23C6 type carbide after aging at 850℃, and the amount and size of M23C6 were increased with enhanced aging time. After aging at 650℃ for 100 h, the precipitated phase in steel was mainly composed of χ phase.
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