固溶温度对S31042耐热钢微观组织和力学性能的影响  

Effect of solution treatment temperature on microstructure and mechanical properties of S31042 heat resistant steel

作　　者：王敬忠[1,2] 刘正东[1] 程世长[1] 包汉生[1] 王斌[1] 

机构地区：[1]钢铁研究总院结构材料研究所,北京100081 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《金属热处理》2011年第2期79-83,共5页Heat Treatment of Metals

基　　金：国家科技支撑计划课题(2007BAE51B02);中信金属铌钢奖学金

摘　　要：研究了固溶温度对S31042耐热钢力学性能及微观组织的影响。结果表明,随着固溶温度升高,钢的硬度和高温强度降低,硬度在1100-1200℃出现了平台;微观组织由静态回复、部分再结晶逐渐过渡到完全静态再结晶,直至晶粒长大,位错密度逐渐降低。随着温度升高Nb的固溶度增大,含Nb析出相颗粒的尺寸减小和数量减少。固溶态钢中只含有Nb（C,N）和NbCrN相。在1180-1250℃×5 min进行固溶处理能满足工业生产要求。Effects of solution treatment temperature on the mechanical properties and microstructure of S31042 heat resistant steel were investigated.The results show that with the solution temperature increasing the hardness and elevated temperature strength of S31042 steel decrease,a platform appear on the hardness curve in the solution temperature range from 1100 ℃ to 1200 ℃,the microstructure of the test steel transforms from static recovery,partial recrystallization to full recrystallization and grain growth,the dislocation density reduces gradually,the solid solubility of niobium increases with the temperature increasing,but the size of precipitation particles containing niobium and its amount are decreased.There are only two phases of Nb（C,N） and NbCrN in S31042 steel after solution treatment.Solution treatment at 1180-1250 ℃ holding for 5 min can meet requirement of the tested steel.

关 键 词：固溶处理 S31042耐热钢 力学性能 再结晶 Nb析出相 

分 类 号：TG142.73[一般工业技术—材料科学与工程]