时效温度对0Cr17Ni4Cu4Nb钢组织及力学性能的影响  

Effect of Aging Temperature on Microstructure and Mechanical Properties of Steel 0Cr17Ni4Cu4Nb

作　　者：胡春燕[1,2] 刘新灵[1,2] 陶春虎[1,2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]航空材料检测与评价北京市重点实验室,北京100095

出　　处：《材料工程》2014年第11期73-78,共6页Journal of Materials Engineering

基　　金：中航工业航材院益材青年基金(YF53110738)

摘　　要：以。Crl7Ni4Cu4Nb马氏体沉淀硬化不锈钢为研究对象，分析了不同时效温度对其显微组织和力学性能的影响，并对试样断口特征进行了观察分析。结果表明：随着时效温度的升高（480～550℃），材料的抗拉强度瓯和屈服强度δp0.2呈逐渐下降的趋势，而材料的断面收缩率缈和伸长率艿。呈逐渐上升的趋势；材料的冲击韧性αku受时效温度的影响比较明显，呈逐渐上升的趋势，其中在550℃时αku达到213．4（J·cm^2）。同时由断口观察分析结果显示，时效温度为55。℃时拉伸断口的放射区最小，其塑性最好；冲击断口塑性变形最为明显，纤维区和剪切唇区所占的比例最大。0Cr17Ni4cu4Nb不锈钢随着时效温度的升高，淬火马氏体基体开始回复、再结晶，逆转变奥氏体开始生成并长大，导致材料中的残余奥氏体含量增加，而残余奥氏体的存在有利于OCrl7Ni4Cu4Nb不锈钢保持良好的塑性和韧性。Based on 0Cr17Ni4Cu4 Nb martensite precipitation hardening stainless steel,the effect of aging temperature on the microstructure and mechanical properties was analyzed and the fracture feature of sample was observed.The experimental results indicate that as the aging temperature goes up(480-550℃),the tensile strengthσband the yield strengthσp0.2show the tendency of gradually decreasing,while the fracture shrinkageΨand elongation rateδ5exhibit the tendency of gradually increasing;the impact toughness akuis affected obviously by the aging temperature,is gradually increasing,among which,at 550℃,akureaches 213.4(J·cm-2).While,the analysis results from fracture observation show that when the aging temperature is at 550℃,the radiation zone of tensile fracture is the minimum,the plasticity is the best;impact fracture plastic deformation is most obvious,the shear lip zone and fibrous zone occupy the largest proportion.For 0Cr17Ni4Cu4 Nb stainless steel,as the aging temperature rises,quenching martensite matrix begins to restore,recrystallize,reverse austensite starts to form and grow,resulting in the increase of content of residual austenite,while the existing of residual austenite is conducive to maintain excellent plastic property and the toughness.

关 键 词：0Cr17Ni4Cu4Nb钢 时效温度 马氏体组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]