低碳钢/高强钢组合结构双丝双钨极氩弧增材制造  

Fabrication of mild steel/high-strength steel composite structure by double wire twin electrode gas tungsten arc additive manufacturing

作　　者：韩庆璘 李鑫磊 张广军[1] HAN Qinglin;LI Xinlei;ZHANG Guangjun(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2022年第2期88-93,I0008,共7页Transactions of The China Welding Institution

基　　金：广东省重点领域研发计划项目(2018B090906004)。

摘　　要：低碳钢/高强钢组合结构能够在保证承载能力的前提下减少合金元素用量,降低成本.文中提出了一种高效、稳定的双丝双钨极氩弧增材制造方法,在400 A大熔敷电流参数下,将低碳钢丝H08Mn2Si与高强钢丝H06MnNi3CrMoA同时送进,开展了熔敷金属的成分调控研究.结果表明,该方法的熔敷效率达到了2.4 kg/h,通过调整双丝的送丝速度比,在不影响电弧状态的前提下,准确获得了所需的熔敷金属成分,并且熔敷金属的抗拉强度、屈服强度、显微硬度随高强钢含量的增加而线性增加,其调节范围分别为565~914,441~803 MPa以及206~327 HV.最后应用该方法实现了低碳钢/高强钢组合结构的滑动轴承模拟件的成形,在轴承基体与轴承衬之间熔敷了成分梯度过渡层,降低了成形件内部的硬度梯度,有效缓和了界面失配问题.The mild steel/high-strength steel composite structure can reduce the amount of alloying elements on the premise of ensuring the bearing capacity, and reduce the cost. An efficient and stable method of double wire twin electrode gas tungsten arc additive manufacturing was proposed in this paper.The mild steel wire H08Mn2Si and the high strength steel wire H06MnNi3CrMoA were fed into the molten pool together at the deposition current of 400 A. The composition gradient regulating research of deposited metal was conducted. The results showed that the deposition rate is 2.4 kg/h. The designed composition of the deposited metal can be accurately achieved by adjusting the ratio of wire feed speeds. The tensile strength,yield strength, and micro hardness of the deposited metal increased linearly with the increase of the high-strength steel mass fraction. The ranges of them are 565-914, 441-803 MPa and 206-327 HV respectively. Finally, a sliding bearing with mild steel/high-strength steel composited structure was designed and the additive manufacturing of it was realized using the proposed method. The component gradient transition zone was deposited between the bearing matrix and the bearing bush to reduce the hardness gradient in the forming part. The bimetallic interface mismatch problem was alleviated.

关 键 词：双钨极氩弧 双丝增材制造 低碳钢 高强钢 

分 类 号：TG444[金属学及工艺—焊接]