Morphological and Textural Evolution of the Alpha Phase during Hot Deformation of Two-Phase Ti-6Al-4V
The deformation behaviour and associated microstructural evolution during hot forging of Ti6A1-4V with a range of initial alpha lamellar microstructures has been examined. Uniaxial compression tests were carried out at temperatures both low and high in the alpha+beta stability field, 880℃ and 950℃ respectively, using strain rates (0. 01,0. 1 and 1/s) relevant to industrial press forging. Orientation image mapping and texture analysis of the alpha phase was used to examine the progressive break-up of the initial structure during the early stages of spherodisation (ε≤ 1). Results indicate that,for the microstructures examined,there is no influence of alpha lath thickness on overall stressstrain response. Flow softening and the attainment of a steady state flow stress appears to be associated with progressive realignment of alpha laths with their long axes perpendicular to the compressive loading direction, rather than with spherodisation of the alpha structure. At 950℃ the development of a single-pole basal texture indicates that the alpha laths become oriented predominantly in a single transverse orientation. At 880℃ deformation also leads to a transverse basal texture,but with the laths distributed radially about the axi-symmetric loading direction.
Ti-6Al-4 V microstructure hot deformation texture
B. Perumal M. A. Rist S. Gungor J. W. Brooks
Materials Engineering Research Group,The Open University,Milton Keynes,MK7 6AA,UK. Advanced Forming Research Centre,University of Strathclyde,Glasgow,G1 1XJ,UK.
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
640-644
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）