堆覆速度对等离子弧双填丝增材制造碳钢堆覆层组织和性能的影响  

Effect of Deposition Speed on Microstructure and Properties of Double-Wire and Plasma Arc Additive Manufactured Carbon Steel Stacking Layer

作　　者：刘思余 冯曰海[1] 占彬 罗振娇 方乐乐 LIU Siyu;FENG Yuehai;ZHAN Bin;LUO Zhenjiao;FANG Lele(School of Materials and Science Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094

出　　处：《机械工程材料》2018年第9期69-72,共4页Materials For Mechanical Engineering

基　　金：总装备部研究项目(7131532);国防创新特区项目(17-H863)

摘　　要：以H08Mn2Si低合金碳钢焊丝为丝材,采用等离子弧双填丝增材制造工艺在Q235钢板上以不同的堆覆速度制备了多层堆覆层试样,研究了堆覆速度对堆覆层宏观尺寸、显微组织和力学性能的影响。结果表明:随堆覆速度的增大,堆覆层表面的成形质量变好,层间纹路变清晰,宏观尺寸减小;堆覆速度越高,堆覆层中的铁素体晶粒越细小,珠光体含量越多,组织均匀性越好;随堆覆速度的增大,堆覆层在纵向和横向的抗拉强度均增大,伸长率略有降低,内部平均显微硬度增大;拉伸断口均呈纤维状,存在大量韧窝,发生了韧性断裂。Multi-layer stacking layer samples were prepared by double-wire and plasma arc additive manufacturing process on Q235 steel plate at different deposition speeds with H08 Mn2 Si low alloy carbon steel welding wire as wire.The effects of deposition speed on the macro size,microstructure and mechanical properties of stacking layer were investigated.The results show that with the deposition speed increasing,the surface formation quality of stacking layer became better,the interlayer lines became clearer,and the macro size decreased.At a relatively high deposition speed,the ferrite grains in the stacking layer were relatively small,the content of pearlite was relatively high,and the microstructure was relatively uniform.With the increase of deposition speed,the tensile strength of stacking layer in both vertical direction and horizontal direction increased,the elongation decreased slightly,and the average microhardness inside increased.The tensile fracture was fiber-like and had a lot of dimples,indicating that the ductile fracture occurred.

关 键 词：双填丝 堆覆速度 等离子弧 丝材电弧增材制造 显微组织 

分 类 号：TG456.2[金属学及工艺—焊接]