铸造技术2026，Vol.47Issue(4)：400-412,13.DOI:10.16410/j.issn1000-8365.2026.6001
激光熔化沉积Ti60/高Nb-TiAl合金功能梯度材料的成形行为与缺陷调控
Forming Behavior and Defect Control of Ti60/High Nb-TiAl Functionally Graded Materials Fabricated by Laser Melting Deposition
摘要
Abstract
To address the urgent demand for lightweight designs and performance gradations in high-temperature aeroengine components,this study employed laser melting deposition(LMD)to systematically investigate the influence of processing parameters on the forming quality of thin-walled components fabricated from Ti60 alloys,high-Nb-TiAl alloys,and their blended compositions and to explore feasible strategies for fabricating crack-free Ti/TiAl functionally graded materials(FGMs).The results demonstrate that with optimized parameters,Ti60 alloy develops a fine and uniform basket-weave microstructure without significant defects.For high Nb-TiAl alloys,elemental segregation occurs during deposition,and excessive energy input readily induces porosity.By preheating at 300℃ and adopting a continuous deposition strategy,cracking is effectively suppressed,resulting in a refined fully lamellar microstructure.Mixed alloys can be deposited without cracks or pores under appropriate energy input.While direct Ti/TiAl transition joints are prone to cracking near the fusion line,a functionally graded structure fabricated through stepwise adjustment of the melt pool width(7.0 mm for Ti60,6.5 mm for transition zone A,6.0 mm for transition zone B,and 5.5 mm for TiAl)achieves good microstructural compatibility and deformation coordination,with no noticeable cracks observed within the graded region.Compared with single-gradient configurations,the double-gradient structure(Ti/A/B/TiAl),which introduces additional compositional transition steps,further mitigates interfacial stress concentration and abrupt changes in hardness,resulting in superior coordination and forming stability.关键词
激光熔化沉积/Ti合金/TiAl合金/功能梯度材料/沉积组织Key words
laser melting deposition/Ti alloy/TiAl alloy/gradient material/deposited microstructure分类
矿业与冶金引用本文复制引用
李瑞丰,丁洁,朱承飞,梁永锋,林均品..激光熔化沉积Ti60/高Nb-TiAl合金功能梯度材料的成形行为与缺陷调控[J].铸造技术,2026,47(4):400-412,13.基金项目
重点新材料研发及应用国家科技重大专项(2025ZD0609100) （2025ZD0609100）
新金属材料全国重点实验室开放基金资助课题(2025-Z08) （2025-Z08）
