固溶温度对S31254超级奥氏体不锈钢显微组织及冲击韧性的影响

Effect of solid solution temperature on microstructure and impact toughness of S31254 super austenitic stainless steel

借助扫描电镜(SEM)、透射电镜(TEM)、X射线能谱仪(EDS)和冲击试验机等研究了固溶温度对9 mm厚的S31254超级奥氏体不锈钢钢板中心位置处显微组织及冲击韧性的影响。结果表明,固溶温度较低时(950~1100℃),钢板的中心位置析出大量的χ相和σ相,析出相呈带状分布。随着固溶温度的升高,析出相数量呈先增加后减少的趋势。固溶温度在1000℃时,由于析出相的数量最多导致实验钢的冲击吸收能量最低;固溶温度超过1150℃,可以有效避免析出相的析出和带状组织的形成,实验钢的冲击韧性明显升高。

Effect of solid solution temperature on center microstructure and impact toughness of S1254 super austenitic stainless steel plate with thickness of 9 mm was studied by means of scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray energy dispersive spectrometer(EDS) analysis and impact testing machine. The results show that when the solid solution temperature is low(950-1100 ℃), a large number of χ and σ phases precipitate in the central position of the steel plate, and the precipitated phases show banded distribution. With the increase of the solid solution temperature, the number of precipitated phases increases first and then decreases. When the solid solution temperature is 1000 ℃, the impact absorbed energy of the experimental steel is the lowest due to the maximum number of precipitated phases. When the solid solution temperature is higher than 1150 ℃, the precipitation of precipitates and the formation of banded structure can be effectively avoided, and the impact toughness of the experimental steel is obviously increased.