摘要
基于钨极氩弧焊的电弧增材制造(GT-WAAM)工艺,以6 mm厚Ti6Al4V合金为基板,直径1.2 mm的Ti6Al4V焊丝为材料,利用CO_(2)进行层间冷却,得到成形均匀的沉积结构。通过对焊接过程热循环特点、沉积形貌、硬度分布及力学性能分析,获得沉积结构质量评价。结果表明,提高冷却速率可以细化沉积结构晶粒,得到针状的α′相,从而改善材料的硬度和抗拉强度;在沉积结构中,堆积高度增加产生的热积累效应,使冷却气体中的C和O元素存在与堆积金属发生潜在的化学反应的可能。采用层间冷却控制层间温度能有效改善沉积结构质量,可使制造效率提高80%以上。
Wire arc additive manufacturing process based on argon tungsten arc welding(GT-WAAM)was carried out on 6 mm-thickness Ti6Al4V alloy base metal with 1.2 mm-diameter filler wire as material,and CO_(2) was uses for interlayer cooling to obtain uniform deposition structure.By analyzing characteristics of thermal cycle,deposition morphology,hardness distribution and mechanical properties of welding process,quality evaluation of deposition structure was obtained.The results showed that increasing cooling rate could refine grains of deposition structure and obtain acicularα′phase,thus improving hardness and tensile strength of material.In deposition structure,heat accumulation effect caused by the increase of deposition height made it possible for C and O elements in cooling gas to have a potential chemical reaction with deposition metal.Using interlayer cooling to control interlayer temperature could effectively improve quality of deposition structure and increase manufacturing efficiency by more than 80%.
作者
赵昀
梁乐
孙宏伟
陈卫彬
张本顺
Zhao Yun;Liang Le;Sun Hongwei;Chen Weibin;Zhang Benshun(Jiangsu Automation Research Institute,Lianyungang 222006,Jiangsu,China)
出处
《焊接》
2024年第2期26-30,共5页
Welding & Joining
基金
国家重点研发计划项目(2021YFB3401100)
国防科工局基础科研项目(JCKY2021206B206)。
关键词
电弧增材制造
TI6AL4V合金
层间冷却
性能
wire arc additive manufacturing
Ti6Al4V alloy
interpass cooling
mechanical properties
