9%Cr钢表面激光熔覆1CrMo合金层的力学性能研究  

Study on Mechanical Properties of 1CrMo Layer Deposited by Laser Cladding on 9%Cr Steel Surface

作　　者：陈智君 乔尚飞[3] 董刚 刘霞 姚建华[1,2] CHEN Zhijun;QIAO Shangfei;DONG Gang;LIU Xia;YAO Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310014,China;Key Laboratory of E&M,Ministry of Education and Zhejiang Province,Zhejiang University of Technology,Hangzhou 310014,China;Turbine Plant,Shanghai Electric Power Generation Equipment Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]浙江工业大学激光先进制造研究院,杭州310014 [2]浙江工业大学特种装备制造与先进加工技术教育部/浙江省重点实验室,杭州310014 [3]上海电气电站设备有限公司汽轮机厂,上海200240

出　　处：《动力工程学报》2020年第8期678-685,共8页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2017YFB1103600);浙江省重点研发计划联合技术研发与示范推广资助项目(2019C04004)。

摘　　要：为了解决9%Cr钢汽轮机转子轴颈堆焊1CrMo合金时,由于稀释率大、热输入高导致的新转子轴径表面降Cr质量分数效率低和磨损后不适合局部修复的问题,采用激光熔覆技术替代堆焊,在9%Cr钢表面进行了1CrMo合金激光熔覆试验,并对熔覆层组织结构和性能进行了测试分析。结果表明:激光熔覆技术可在9%Cr钢表面制备成形质量及力学性能良好的1CrMo合金熔覆层,熔覆层组织主要由铁素体和颗粒状碳化物组成;与堆焊相比,激光熔覆可有效降低基体对熔覆层的稀释率,提高表面降Cr质量分数效率;与基体材料相比,1CrMo合金熔覆层强度略低,但塑韧性更好,力学性能达到9%Cr钢汽轮机转子轴颈设计要求。To solve the problem of low Cr reduction efficiency on the journal surface of a 9%Cr steel rotor caused by high dilution rate and high heat input when surfacing 1 CrMo alloy on the rotor journal,where local repair is not available after wear damage,a deposit welding test was carried out with 1 CrMo alloy on the surface of 9%Cr steel by laser cladding instead of surfacing,following which,the microstructure and properties of the 1 CrMo cladding layer were tested and analyzed.Results show that the laser cladding technology helps to form good cladding of 1 CrMo alloy on the surface of 9%Cr steel,with high mechanical properties of the cladding layer.Compared with surfacing technology,the laser cladding can effectively reduce the dilution of substrate to the cladding layer,thus improving the Cr reduction efficiency of the surface.Compared with the base metal,the tensile strength of 1 CrMo cladding is slightly lower,but its ductility and toughness are better,proving the mechanical properties of 1 CrMo cladding to meet the design requirements of 9%Cr rotor journal in steam turbines.

关 键 词：9%Cr钢 激光熔覆 1CrMo合金 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]