摘要
以激光熔丝增材制造为基础,结合激光摆动焊接技术,创新性地提出一种激光摆动熔丝增材制造新工艺。首先在无激光摆动的条件下对激光功率P、送丝速度Vs、打印速度Vp进行工艺调控,在圆形摆动下调试合适的摆动频率f、摆动幅度A和搭接率η。对TC4钛合金进行单道试验,通过对比发现,当P=2500 W、V_(s)=3 m/min、V_(p)=2.5 m/min、f=300 Hz、A=1 mm、η=50%时沉积成形质量较好。基于单道试验,进行了多道多层打印,利用XRD、TEM、SEM、EBSD对沉积态和退火之后的组织和相进行分析。结果表明,单道打印与多层多道打印下,显微组织主要呈现为细长的针状马氏体α′和初始柱状β晶粒;同时,β晶粒呈现不规则形状,生长取向发生明显变化,α′尺寸细小,组织排布紧密,为典型的魏氏组织。经过再结晶退火(800℃/2 h,炉冷)之后,出现α相晶界,并且α相有长大趋势。
Based on the wire laser additive manufacturing,this paper innovatively proposes a new process of additive manufacturing of laser wobble fuse combined with laser swing welding technology.Firstly,the laser power P,wire feeding speed Vs,and printing speed Vp are controlled in the process without laser swing,and the appropriate swing frequency f,swing amplitude A and overlap rateηare adjusted under circular swing.A single-channel experiment was performed on TC4 titanium alloy,and it was found by comparison that the deposition quality was better when P=2500 W,V_(s)=3 m/min,V_(p)=2.5 m/min,f=300 Hz,A=1 mm andη=50%.Based on the single-pass experiment,multi-pass multilayer printing was carried out,and the microstructure and phase of the as-deposited state and after annealing were analyzed by XRD,TEM,SEM and EBSD.The results show that the microstructures are mainly slender acicular martensiteα′and initial columnarβgrains under single-pass printing and multi-layer multi-pass printing.In addition,theβgrains are irregular in shape,the growth orientation changes obviously,theα′size is small,and the structure is closely arranged,which is a typical widmanstetten structure.After recrystallization annealing(800℃/2 h,furnace cooling),the grain boundary ofαphase appears,and theαphase tends to grow.
作者
顾海
张捷
孙健华
姚建南
孙中刚
GU Hai;ZHANG Jie;SUN Jianhua;YAO Jiannan;SUN Zhonggang(Nantong Institute of Technology,Nantong 226002,China;Nantong University,Nantong 226019,China)
出处
《航空制造技术》
CSCD
北大核心
2022年第20期124-131,共8页
Aeronautical Manufacturing Technology
基金
南通理工学院省级科技服务平台培育项目(XQPT202101)
江苏省科技计划(BE2018010–4)
江苏省“青蓝工程”(苏教师函[2021]11号)
南通市科技计划(JC2020155、JCZ19122、JC2020132)
江苏省产学研合作项目(BY2020545)。
