Influence of Build Geometry on Beta Grain Structure and Texture during Additive Layer Manufacture (ALM) of Ti-6Al-4V by Electron Beam Selective Melting
In titanium alloys it is known that in bulk sections the solidification conditions in additive layer manufacture (ALM) commonly lead to undesirable, coarse, columnar β grain structures. Here, we have investigated the effect of build geometry on the grain structure and associated texture in Ti-6Al-4V ALM components produced by Selective Electron Beam Melting (SEBM). Through reconstruction of the primary β-phase,it has been confirmed that in thick sections large columnar β grains grow with a strong <001>β fibre texture,although there is a significant skin effect. In contrast, in thin walls nucleation off the surrounding powder and growth inwards dominates. Local grain structure heterogeneities are also observed within section transitions from,for example,support structures.
Titanium (Ti) ALM electron beam selective melting epitaxial growth β grains texture
Alphons A Antonysamy Phil B Prangnell Jonathan Meyer
School of Materials,Materials Science Centre,Univ. of Manchester,Manchester M13 9PL,England,UK EADS Innovation Works,Airbus,Filton,Bristol BS99 7AR,England,UK
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1830-1834
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）