轴类零件电弧熔丝轧制复合增材修复工艺研究  

Repair Process of Shaft Parts by Composite Wire and Arc Additive Manufacturing and Rolling

作　　者：徐宏图 田天泰 华昺力 詹文斌 韩宾[1] 张琦[1] XU Hong-tu;TIAN Tian-tai;HUA Bing-li;ZHAN Wen-bin;HAN Bin;ZHANG Qi(School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《精密成形工程》2023年第11期1-8,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(52275375);陕西地建-西安交大土地工程与人居环境技术创新中心开放基金(201912131-A3)。

摘　　要：目的针对电弧熔丝增材修复轴类零件时修复层出现柱状晶粒、修复质量不佳等问题,进行电弧熔丝和轧制复合的增材修复工艺研究。方法研究了电弧熔丝和轧制复合的轴类零件修复工艺,即在焊枪后紧邻一个轧辊,对沉积层进行轧制,使材料在高温下发生塑性变形。开发、制造和测试了一种新型设备,并在316L不锈钢轴上进行了修复实验。研究了轧制对修复件拉伸性能、硬度和微观结构的影响,并对沉积层和结合界面进行了电子背散射衍射(EBSD)表征。结果轧制导致了动态再结晶(DRX)形核从而细化了微观组织。与基体金属相比,修复层的硬度提高了20%~30%,屈服强度从220MPa提高到432MPa,极限抗拉强度从540MPa提高到595MPa。结论采用电弧熔丝和轧制复合的修复工艺可以细化修复层微观组织,提高修复层的力学性能,该工艺可以有效解决轴类零件的修复问题。Aiming at the problems of columnar grains in the repair layer and poor repair quality during wire and arc additive repair of shaft parts,the work aims to study the composite repair process of wire and arc additive manufacturing and rolling.The composite process of wire and arc additive manufacturing and rolling used to repair shaft parts was investigated,in which the deposition layer was rolled by the roller after welded by welding torch,so that the material was plastically deformed at high temperature.A novel device was developed,fabricated and tested,and repair experiments were conducted on 316L stainless steel shafts.The effect of rolling on the tensile properties,hardness and microstructure of the repaired part was investigated and the deposition layer and interface were characterized by electron backscatter diffraction(EBSD).Rolling led to dynamic recrys-tallization(DRX)nucleation,thereby refining the microstructure.Compared with the base metal,the hardness of the repair layer increased by 20%-30%,and the yield strength and ultimate tensile strength increased from 220 MPa to 432 MPa and from 540 MPa to 595 MPa,respectively.The composite repair process of wire and arc additive manufacturing and rolling can refine the microstructure of the repair layer and improve the mechanical properties of repair layer,so it can effectively solve the problems in the repair of shaft parts.

关 键 词：电弧熔丝增材制造 轧制 轴类零件 修复 再结晶 

分 类 号：TH162[机械工程—机械制造及自动化]