固溶温度对铸造高氮钢组织与性能的影响

Effect of Solution Temperature on Microstructure and Properties for Casting High Nitrogen Steel

以Fe-18Cr-18Mn-N系合金作为研究对象,系统研究了不同固溶温度对铸造高氮钢的微观组织与力学性能的影响,确定了试验高氮钢固溶工艺的温度范围,实现了试验高氮钢合理的强韧性匹配。研究结果表明:随着固溶温度的升高,试验高氮钢的晶粒尺寸变化不明显,而晶界处析出相则逐步固溶,其尺寸和数量逐步下降。提高固溶温度后,抗拉强度、延伸率逐步上升,而延伸率、低温冲击性能则是达到峰值后均有回落的现象。上述研究成果可为未来试验高氮钢的推广应用提供理论支撑。

It was studied that the effects of different solution temperature on the microstructure and mechanical properties for the casting Fe-18Cr-18Mn-N steel,the temperature range of the solution process for the experimental steel was determined,and its reasonable strength and toughness matching were realized.The results showed that with the increase of solution temperature,the grain size of experimental steel did not change obviously,and the precipitates were dissolved at the grain boundary gradually,the size and quantity of the precipitates decreased gradually.When the solution temperature was increased,the tensile strength and elongation were increased at the same time.The elongation and low temperature impact property were both decreased after reaching the peak value.The research results could provide theoretical support for the popularization and application of high-nitrogen steels in the future.