超超临界机组叶片用KT5331钢的热处理工艺  

Heat treatment of KT5331 blade steel for ultra supercritical unit

作　　者：宋明强[1] 李俊儒[1] 龚臣[1] 陈列[2] 佐辉[2] 刘雅政[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]西宁特殊钢股份有限公司,青海西宁810005

出　　处：《材料热处理学报》2015年第9期61-66,共6页Transactions of Materials and Heat Treatment

基　　金："十二五"国家863计划项目(2012AA03A502)

摘　　要：用热处理正交实验方法研究了淬火工艺与回火工艺对KT5331(10Cr11Co3W3Ni Mo VNb NB)钢力学性能的影响。结果表明,KT5331钢的最佳热处理工艺为1080℃保温60 min淬火,680℃保温2 h以上回火,组织为板条状的回火马氏体;淬火和回火参数中,回火温度是影响KT5331钢热处理后力学性能的最主要因素,淬火温度及回火温度对冲击功影响最为明显。淬火温度由1080℃升高至1120℃时奥氏体晶粒出现明显长大;随回火温度升高,材料屈服强度、抗拉强度和硬度明显降低,而冲击功显著升高。Influence of quenching and tempering process on mechanical properties of KT5331 steel was investigated by orthogonal experiment. The results show that the optimal heat treatment parameters for KT5331 steel,are quenching at 1080 ℃ for 60 min and then tempering at 680 ℃ for 2 h,by which the microstructure of the steel is tempered martensite. Compared to other heat treatment parameters,the tempering temperature is the main factor to the mechanical property. Both the quenching and tempering temperatures significantly affect the toughness of the steel. The austenitic grain sizes obviously grow up when the quenching temperatures increases from1080 ℃ to 1120 ℃. With the increasing tempering temperature,the tensile strength,the yield strength and the micro-hardness of the steel are reduced obviously and its toughness increases.

关 键 词：KT5331 热处理 正交实验 力学性能 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG156.1[金属学及工艺—金属材料]