INFLUENCE OF INITIAL MICROSTRUCTURE ON HOT WORKABILITY OF Ti-6Al-4V ALLOY
Hot workability of Ti-6Al-4V alloy with different initial microstructures was investigated by considering processing maps and the dynamic material deformation behavior. The emphasis has been focused on the effect of initial microstructure (equiaxed versus bimodal structure). Process maps were generated using the dynamic material model (DMM), unifying the relationships between constitutive deformation behavior, hot workability and microstructures evolution. Also, the flow instability was investigated using the various flow instability criteria and microstructural analysis. To establish the processing maps with different initial microstructures, high temperature compression tests were carried out at various temperatures and strain rates up to a true strain of 0.7. Microstructural changes occurring during the deformation were analyzed in terms of high temperature deformation mechanisms. Finally the useful instability criterion for predicting the forming defects was suggested through the compression test results with different temperatures and strain rates.
Ti-6Al-4V alloy hot workability dynamic materials model flow instability
JONG-TAEK YEOM JEOUNG HAN KIM JAE-KEUN HONG NHO-KWANG PARK CHONG SOO LEE
Special Alloys Research Group, Korea Institute of Materials Science, Changwon, 641-831, Korea Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
808-813
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）