回火温度对15Cr2Ni3MoW钢组织与力学性能的影响  

Effect of tempering temperature on microstructure and mechanical properties of 15Cr2Ni3MoW steel

作　　者：王斌[1] 易丹青[1] 刘会群[1] 吴伯涛[1] 袁均平[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2008年第6期73-77,共5页Transactions of Materials and Heat Treatment

基　　金：湖南省科技攻关项目(04GK1008-2)

摘　　要：观察了15Cr2Ni3MoW钢在200～600℃区间回火处理后的力学性能和组织变化。结果表明,该钢经350℃回火后出现大量稳定化的M/A岛,在500～550℃回火后M/A岛大量分解,析出的碳化物沿晶界连续分布,出现了回火脆性。试验获得的最佳回火工艺为:350℃回火3h后空冷,该工艺可使15Cr2Ni3MoW钢的屈服强度提高37%,冲击韧性提高50%。The mechanical properties and microstructure evolution of 15Cr2Ni3MoW steel after tempering treatment in the range of 200 - 600℃ were investigated. The results show that large amount of stabilized M/A island appears after tempering treatment at 350℃. The M/A islands decompose, the precipitated carbide is distributed along grain boundary continuousally, and tempering brittleness occurs for the steel tempered at 500 - 550℃ . The optimized tempering process is tempering the steel at 350℃ for 3h and air cooling, which increases ultimate tensile strength and impacting toughness of the steel by 37 % and 50%, respectively.

关 键 词：15Cr2Ni3MoW钢 粒状贝氏体 回火 M/A岛 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.5[金属学及工艺—金属材料]