摘要
以冷金属过渡电弧增材制造的方法成形了316L奥氏体不锈钢单道多层薄壁件,分析了不同焊接参数下材料的成形宽度、侧面成形误差、沉积有效率以及显微组织的变化.结果表明,随着焊接速度的减小,成形试样的宽度逐渐增大;随着热输入的增加,侧面成形误差呈先减小后增大的趋势,沉积有效率呈先增大后减小的趋势,侧面成形误差与沉积有效率的变化相反.沉积效率越大,侧面成形误差越小,成形有效率可达到90%以上.成形件显微组织为γ-Fe和δ铁素体,δ铁素体形貌有树枝状和蠕虫状两种.显微硬度测试结果显示在垂直于沉积方向和平行于沉积方向硬度值变化不大,这与各方向成形材料的显微组织比较均匀有关.
316L austenitic stainless steel thin-walled samples were formed by cold metal transfer(CMT)based on wire arc additive manufacturing(WAAM)method.The forming width,side forming error,deposition efficiency and microstructure of the samples under different welding parameters were investigated.The results show that when the parameters are consistent,the width of the formed specimen increases with the decreasing of the welding speed.The side forming error reduces firstly and then increases with the increasing of the heat input.The deposition efficiency increases firstly and then reduces,and the side forming error and the deposition efficiency trend are the opposite.The more the deposition efficiency,the lower the side forming error,and the forming efficiency can reach more than 90%.The microstructure of the formed parts consists ofγ-Fe phase andδferrite phase.The microhardness tests show that the hardness along the vertical and the deposition direction did not change significantly,which is related to the uniform microstructure of the sample.
作者
王晓光
刘奋成
方平
吴仕峰
WANG Xiaoguang;LIU Fencheng;FANG Ping;WU Shifeng(National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2019年第5期100-106,I0006,I0007,共9页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51565041,51865036)
江西省自然科学基金资助项目(20171BAB206004)
江西省教育厅科研资助项目(GJJ170581)
关键词
冷金属过渡
侧面成形误差
沉积有效率
显微组织
cold metal transfer
side forming error
deposition efficiency
microstructure
