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借助金相显微镜及高分辨扫描电镜等试验手段,研究了不同加热拆卸温度对1Mn18Cr18N奥氏体不锈钢组织和性能的影响规律。结果表明:随加热温度的提高,晶粒内部滑移线变少,在500℃至600℃晶界及滑移线析出相由点状或链状向半网状或全网状析出;析出物的产生对1Mn18Cr18N钢的力学性能影响显著,当加热温度提高到500℃(550℃),析出相弥散分布对冲击(拉伸)性能起到一定的强化作用,当加热温度提高到600℃,全网状析出相使晶界弱化造成1Mn18Cr18N钢的拉伸及冲击性能急剧下降。断口分析表明,随加热温度的提高,1Mn18Cr18N钢断裂形式由韧性断裂向准解理断裂和脆性断裂形式转变。
With metallographic microscope and high resolution scanning electron microscopy and other test methods, the effects of different heating removal temperature on the microstructure and properties of 1Mn18Cr18N austenitic stainless steel were studied. The results show that with the increase of the heating temperature, the slip line in the grain decreases, and the grain boundary and slip line precipitates from point or chain to semi-mesh or full mesh at 500 ℃ to 600 ℃. The precipitates , The mechanical properties of 1Mn18Cr18N steel are significantly affected. When the heating temperature is raised to 500 ℃ (550 ℃), the dispersion of precipitation phase enhances the impact (tensile) properties. When the heating temperature is raised to 600 ℃, Mesh precipitation phase weakening the grain boundary caused by 1Mn18Cr18N steel tensile and impact properties dropped sharply. Fracture analysis shows that with the increase of heating temperature, the fracture mode of 1Mn18Cr18N steel changes from ductile fracture to quasi-cleavage fracture and brittle fracture.