CAJ | 학술논문

利用激光直接沉积技术成形Ti60合金，研究热等静压—双重退火对激光直接沉积Ti60合金缺陷、组织及拉伸性能的影响。结果表明：激光直接沉积Ti60合金存在气孔和未熔合两种缺陷，经热等静压处理后，气孔和尺寸较小的未熔合缺陷消除；沉积态试样底部和中部为柱状晶，顶部为等轴晶，显微组织为魏氏组织，由板条α和板条间β组成；经热等静压—双重退火处理后，晶界α消融，大部分原始β晶界消失，α板条粗化，长宽比减小，显微组织变为网篮组织；与锻件相比，沉积态试样拉伸强度较高，塑性较低，经热等静压—双重退火处理后，其塑性达到了锻件标准。
이용격광직접침적기술성형Ti60합금，연구열등정압—쌍중퇴화대격광직접침적Ti60합금결함、조직급랍신성능적영향。결과표명：격광직접침적Ti60합금존재기공화미용합량충결함，경열등정압처리후，기공화척촌교소적미용합결함소제；침적태시양저부화중부위주상정，정부위등축정，현미조직위위씨조직，유판조α화판조간β조성；경열등정압—쌍중퇴화처리후，정계α소융，대부분원시β정계소실，α판조조화，장관비감소，현미조직변위망람조직；여단건상비，침적태시양랍신강도교고，소성교저，경열등정압—쌍중퇴화처리후，기소성체도료단건표준。
Ti60 alloys were fabricated by using direct laser deposition (DLD) technology and it was studied that the effects of hot isostatic pressing (HIP) on defects, microstructure and tensile properties of the DLD Ti60 alloys. The results show that there are two typical kinds of defects in the DLD Ti60 alloys, which are pores and lack of fusion. After HIP treatment, pores and the small size of lack of fusion are eliminated. There are columnar crystals at the bottom and the middle of the as- deposited specimens, but at the top of the specimens are equiaxed grains. The microstructure is widmanstatten structure, which is composed of alpha laths and beta between the laths. After HIP and double annealing treatment, the grain boundary alpha melting, the most of the original beta grain boundaries disappear, alpha laths coarsening, the length- width ratio decreases, and the microstructure becomes basket- weave microstructure. Compared with the forgings, the as- deposited specimens have a high tensile strength with a low plasticity, after HIP and double annealing treatment, the plasticity of the as- deposited specimens exceeds the standards of the forgings.