基板材料对激光熔化沉积制造Ti-48Al-2Cr-2Nb合金组织、织构、相和显微硬度的影响

Effect of Substrate Material on the Microstructure, Texture, Phase and Microhardness of a Ti-48Al-2Cr-2Nb Alloy Processed by Laser Melting Deposition

研究了基体材料对激光熔化沉积Ti-48Al-2Cr-2Nb合金显微组织、织构、相组成和硬度的影响。随着沉积层数的增加,沉积层的显微组织由网篮状结构向等轴状结构转变,最终演变为层状结构。α2(Ti3Al)相逐渐减少,γ(TiAl)相逐渐增多。不同的TiAl合金层具有不同的显微硬度,随着沉积层数的增加,显微硬度降低。研究结果对于激光沉积制造TiAl合金制备具有可接受的组织、织构、相组成和显微硬度具有参考价值。

Effect of substrate material on the microstructure,texture,phase and hardness of a Ti-48Al-2Cr-2Nb alloy processed by laser melting deposition(LMD)was investigated.With the increase of the number of deposited layers,the microstructure of the deposited layers changes from basket structure to equiaxed structure and finally evolves into lamellar structure,andα2(Ti3Al)phase decreases andγ(TiAl)phase increases gradually.Different TiAl alloy layers show different microhardness.With the increase of the number of deposited layers,the microhardness decreases.The findings will be a valuable reference for fabricating TiAl components with acceptable microstructure,texture,phase compositions and microhardness by LMD.