The effect of electropulsing treatment on microstructure and mechanical strength of laser metal deposited Ti−6Al−4V alloy was investigated in order to eliminate the anisotropy in strength of laser metal deposited Ti−6...The effect of electropulsing treatment on microstructure and mechanical strength of laser metal deposited Ti−6Al−4V alloy was investigated in order to eliminate the anisotropy in strength of laser metal deposited Ti−6Al−4V alloy by tensile tests,optical microscopy,scanning electron microscopy,electron back-scattered diffraction analyses and transmission electron microscopy.With increasing applied voltages from 0 to 130 V,the evolution of microstructure within columnarβgrains followed the sequence ofα′martensite→colonyαstructure→basket-weaveαstructure.The electropulsing treated at 130 V weakened the texture of martensite withinβgrains.The as-built Ti−6Al−4V alloy showed an anisotropy in yield strength(6.2%).After processing at 130 V,the anisotropy in yield strength was reduced to 0.6%,which was attributed to the almost equivalent distribution of Schmid factor in the samples deformed along different orientations.展开更多
基金financial supports from the National Key R&D Program of China (No.2017YFE0123500)。
文摘The effect of electropulsing treatment on microstructure and mechanical strength of laser metal deposited Ti−6Al−4V alloy was investigated in order to eliminate the anisotropy in strength of laser metal deposited Ti−6Al−4V alloy by tensile tests,optical microscopy,scanning electron microscopy,electron back-scattered diffraction analyses and transmission electron microscopy.With increasing applied voltages from 0 to 130 V,the evolution of microstructure within columnarβgrains followed the sequence ofα′martensite→colonyαstructure→basket-weaveαstructure.The electropulsing treated at 130 V weakened the texture of martensite withinβgrains.The as-built Ti−6Al−4V alloy showed an anisotropy in yield strength(6.2%).After processing at 130 V,the anisotropy in yield strength was reduced to 0.6%,which was attributed to the almost equivalent distribution of Schmid factor in the samples deformed along different orientations.
