【作者】 薛诚； 赵丹； 张顺凯； 石玗；

【Author】 XUE Cheng;ZHAO Dan;ZHANG Shun-Kai;SHI Yu;School of Materials Engineering,Lanzhou Institute of Technology;School of Petrochemical Engineering,Lanzhou University of Technology;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology;

【机构】 兰州工业学院材料工程学院； 兰州理工大学石油化工学院； 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室；

【摘要】 本研究采用冷金属过渡(CMT)焊接技术对10 mm厚316不锈钢进行丝材电弧增材制造(WAAM),重点研究焊接电流、焊接速度及层间温度等关键工艺参数对焊接接头微观组织与耐腐蚀性能的影响。试验以Q235钢为基板,选用直径1.2 mm的316不锈钢焊丝,首先通过单道单层焊接筛选出成形良好的焊接电流与焊接速度参数组合,在此基础上开展单道10层堆焊实验,并借助自然冷却与红外测温仪控制不同层间温度。对所得增材试样进行切割、抛光后,利用光学显微镜(OM)、扫描电子显微镜(SEM)和电子背散射衍射(EBSD)等手段分析焊缝区的微观组织演变、晶粒尺寸及晶体学取向。通过电化学测试方法,包括开路电位(OCP)、动电位极化曲线(Tafel)和电化学阻抗谱(EIS),系统评估焊接参数及取样位置对增材构件耐腐蚀性能的影响规律。结果表明,焊接参数显著影响沉积层的晶粒结构与腐蚀行为,为优化CMT增材制造工艺提供了实验依据。更多还原

【Abstract】 This study employs cold metal transfer(CMT) welding technology for wire and arc additive manufacturing(WAAM) of 10 mm thick 316 stainless steel,focusing on the effects of key process parameters—welding current,welding speed,and interlayer temperature—on the microstructure and corrosion resistance of the welded joint.Using a Q235 steel substrate and 1.2 mm diameter 316 stainless steel welding wire,single-bead single-layer welding was first conducted to identify an optimal combination of welding current and speed ensuring good bead morphology.Based on this,single-bead ten-layer deposition was performed,with different interlayer temperatures controlled through natural cooling assisted by an infrared thermometer.The as-fabricated samples were sectioned and polished for microstructural characterization using optical microscopy(OM),scanning electron microscopy(SEM),and electron backscatter diffraction(EBSD) to analyze microstructural evolution,grain size,and crystallographic orientation in the weld zone.Electrochemical tests,including open circuit potential(OCP),potentiodynamic polarization(Tafel),and electrochemical impedance spectroscopy(EIS),were carried out to systematically evaluate the influence of welding parameters and sample location on the corrosion resistance of the additively manufactured component.The results demonstrate that the welding parameters significantly affect the grain structure and corrosion behavior of the deposited layers,providing experimental basis for optimizing the CMT-based additive manufacturing process.更多还原