两种热锻模盖面堆焊修复用药芯焊丝的性能对比研究  

Comparative Study on Performance of Two Flux-cored Wires for Surfacing Repair of Hot Forging Die

作　　者：杨世明 秦训鹏[1] 黄康文 YANG Shiming;QIN Xunpeng;HUANG Kangwen(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430000,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430000

出　　处：《热加工工艺》2023年第5期13-18,24,共7页Hot Working Technology

基　　金：国家重点研发计划项目(2018YFB1106500);中国博士后科学基金项目(2020M682498)。

摘　　要：对RMD756和HX2048G热锻模修复焊丝的焊接工艺性、堆焊金属成分、组织和力学性能进行了对比研究。结果表明:焊接参数取电压23.2 V、电流260 A、送丝速度5.6m/min时,焊缝成形性较好。两种焊材堆焊金属的合金元素种类复杂,与常用模具钢成分区别大,均呈低C高Cr特点。两种焊丝堆焊金属在室温下的抗拉强度均在1000 MPa以上,550℃时抗拉强度在800 MPa左右。RMD756堆焊金属的冲击韧性为7 J/cm^(2),呈解理断裂;HX2048G堆焊金属的冲击韧性为19 J/cm^(2),呈准解理断裂。两种焊材堆焊金属在550℃干摩擦下均以粘着磨损和氧化磨损为主,RMD756堆焊金属摩擦表面Cr、Al的氧化物更多,氧化剥蚀坑更少,磨损量更低。The welding procedure of the two hot forging die repair flux-cored welding wires of RMD756 and HX2048G,and the composition,structure and mechanical properties of the deposited metals were stuedied comparatively.The results show that when the welding parameters are voltage of 23.2 V,currenct of 260 A and wire feeding speed of 5.6 m/min,the weld formation is good.The alloy elements of the deposited metals with the two welding wires are complex and quite different from the die steel composition,both of them show the characteristics of low carbon content and high chromium content.The tensile strengths of RMD756 and HX2048G deposited metals at room temperature are above 1000 MPa,and the tensile strengths at 550℃are about 800 MPa.The RMD756 deposited metal has an impact toughness of 7 J/cm^(2),showing cleavage fracture,while the HX2048G deposited metal has an impact toughness of 19 J/cm^(2),showing quasi-cleavage fracture.Both the deposited metals of the welding consumables are dominated by adhesive wear and oxidative wear under dry friction at 550℃.The RMD756 deposited metal has lower wear rate compared with the HX2048G deposited metal,the abrasive surface has more oxides of Cr and Al and fewer oxidation and erosion pits.

关 键 词：热锻模 药芯焊丝 焊接工艺性 力学性能 

分 类 号：TG444.7[金属学及工艺—焊接] TG115.6