10Cr21Mn16NiN高锰氮奥氏体不锈钢组织与性能研究

研究了固溶处理温度对热轧态10Cr21Mn16NiN高锰氮奥氏体不锈钢微观组织、力学性能和腐蚀性能的影响,并进一步揭示了该材料的低温韧脆转变行为。结果表明,随着固溶温度的升高,屈服强度和抗拉强度逐渐降低,而延伸率和耐腐蚀性能逐渐增大。这是因为高温固溶促进了热轧阶段形成的有害相重新溶解,从而消除析出相对性能带来的不利影响。10Cr21Mn16NiN钢在低温冲击载荷下表现出明显的韧脆转变行为,韧脆转变温度在-110℃附近,高于-110℃可以获得强度与韧性的良好配合。

Study on Microstructure and Properties of 10Cr21Mn16NiN High Mn-N Austenitic Stainless Steel

The relationship between microstructure and mechanical properties of 10Cr21Mn16NiN steel was analyzed on the basis of the room temperature tensile properties after different heat treatments.The results show that the microstructure of the steel after solid solution treatment in the range of 1 000～1 350 ℃ was fully austenitic.When the temperature was below 1 150 ℃,grains were fine,grain size was 6～8 grade,a large number of undissolved nitrides dispersd in the austenitic matrix;when the temperature was higher than 1 150 ℃,grains were coarse,grain size was 1～3 grade,the undissolved nitrided decreased.Room temperature yield strength and tensile strength decreased with increasing solid solution temperatured,the elongation and surface shrinkage rate increased with increasing solid solution temperature,but their rates of change were not great.After solid solution treatment at about 1 150℃,the steel had high strength and good ductility.