正火冷却方式对9%Cr铁素体耐热钢组织与力学性能的影响  

Effect of Normalizing Cooling Method on Microstructure and Mechanical Properties of 9%Cr Ferritic Heat Resistant Steel

作　　者：马廷威[1,2] 王玉红 郝宪朝[3] 王平[2] 张宇博[1] MA Tingwei;WANG Yuhong;HAO Xianchao;WANG Ping;ZHANG Yubo(Yingkou Institute of Technology,Yingkou 115014,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]营口理工学院,营口115014 [2]东北大学,材料电磁过程研究教育部重点实验室,沈阳110819 [3]中国科学院金属研究所,中国科学院核用材料与安全评价重点实验室,沈阳110016

出　　处：《机械工程材料》2023年第10期85-90,共6页Materials For Mechanical Engineering

基　　金：营口理工学院2022年大学生创新创业项目(X202214435027)。

摘　　要：采取油冷和水冷2种冷却方式对9%Cr铁素体耐热钢进行正火处理,再进行回火,研究了正火冷却方式对该钢组织和力学性能的影响。结果表明:与水冷相比,油冷处理后试验钢的马氏体板条宽度较大,位错密度较小,晶界上析出的M_(23)C_(6)碳化物尺寸较小;与水冷相比,油冷处理后试验钢的屈服强度、抗拉强度、断后伸长率以及上平台冲击吸收功分别提高了9.3%,4.7%,6.1%,5.4%,韧脆转变温度降低了17.7℃,拉伸性能和冲击性能提高。The 9%Cr ferritic heat resistant steel was normalized by oil cooling and water cooling,and then was tempered.The effects of normalizing cooling methods on the microstructure and mechanical properties of the test steel were studied.The results show that compared with those by water cooling,the strip width of the martensitic slats of the test steel by oil cooling was larger,the dislocation density was smaller,and the size of M_(23)C_(6) carbide precipitated on the grain boundary was smaller.Compared with those by water cooling,the yield strength,tensile strength,percentage elongation after facture and impact absorption work on the upper platform of the test steel by oil cooling increased by 9.3%,4.7%,6.1%,5.4%,respectively,and the tough-brittle transition temperature was reduced by 17.7 ℃;the tensile properties and impact properties were enhanced.

关 键 词：冷却方式 9%Cr铁素体耐热钢 力学性能 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]