The Effect of Processing Temperature on Texture Evolution and Variant Selection during Phase Transformation in Ti-6A-4V
In the present study, the role of starting texture on texture evolution and variant selection during α→β→α transformation has been studied Firstly, the samples were thermomechanically processed at different temperatures in order to generate significantly different α texture but similar recrystallized grain morphology in both cases. Subsequently, both materials were recrystallized and then heat-treated above the β transus followed by 1℃/min cooling rate to promote diffusional phase transformation starting from β grain boundary. EBSD texture analysis in both specimens showed that β heat treatment produced α texture components that were similar to the recrystallized α texture but with different intensities. The degree of variant selection was assessed by comparing the strength of the measured and predicted α texture from high temperature β texture assuming equal occurrence of all the possible 12 variants during β→α transformation. It was found that the material rolled at 950℃ showed a greater tendency to variant selection than the material rolled at 800℃ but the latter shows an overall stronger texture after ( heat treatment. The findings are discussed in terms of β nucleation energies and combination of a texture components promoting the occurrence of β grain pairs with a common (110) pole.
Ti-6Al-4V rolling temperature texture evolution variant selection
G. C. Obasi S. Birosca D. G. LeoPrakash J. Quinta da Fonseca M. Preuss
Manchester Materials Science Centre,Grosvenor street,Manchester Ml 7HS,U. K
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
771-775
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）