热处理对超级13Cr不锈钢组织及拉伸性能的影响

Effect of heat treatment process on microstructure and tensile properties of super 13Cr stainless steel

为了研究热处理工艺对超级13Cr不锈钢组织及拉伸性能的影响,采用了光学显微镜、X射线衍射仪、透射电子显微镜、显微硬度测试及应变速率拉伸等试验方法。结果表明,经过水淬和油淬处理的超级13Cr不锈钢组织及拉伸性能相差不大。但相比于水淬,采用油淬的试样经回火处理后塑性得到更大提升。淬火试样经回火处理后,组织变为回火索氏体。随着回火温度升高,材料的塑性先增加后减小,硬度与强度变化则相反。620℃回火试样含有逆变奥氏体,强度塑性组合较好。二次回火能够增加超级13Cr不锈钢中逆变奥氏体含量,但塑性变化不明显,强度下降较大。

In order to study the effect of heat treatment process on microstructure and tensile properties of super13 Cr stainless steel,optical microscopy,X-ray diffraction,transmission electron microscopy,microhardness,and slow strain rate tensile methods were used.The results showed there was little difference of the microstructure and tensile properties between water-quenched and oil-quenched super 13 Cr stainless steel.The plasticity of oil-quenched samples improved significantly after tempering,compared with water-quenched samples.The microstructure of oilquenched samples became fine tempered martensite after tempering.The plasticity of the material increased first and then decreased as the tempering temperature increasing,but the hardness and strength were the opposite.The620℃-tempered specimen was contained the reversed austenite and had a good combination of strength and plasticity.Two times temper increased the amount of reversed austenite and the plasticity had little change,but the strength reduced obviously.