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Title Study on Variants of Solution Treatment and Aging Cycle of Titanium Alloy Ti6Al4V
 
Names GUPTA, RK
KUMAR, VA
CHHANGANI, S
Date Issued 2016 (iso8601)
Abstract Ti6Al4V with two different chemical compositions, one rich and the other lean in alpha-stabilizer oxygen were selected to study the effect of quench severity during solution treatment and their aging response. These two coupons were taken from two differently processed wrought products viz. rolled ring and closed die forging. The coupons were then subjected to solution treatment followed by employing different cooling rates to vary the quench severity and different aging treatments by changing the aging temperature and time. The microstructure and mechanical properties thus obtained are correlated with respect to the heat treatment conditions. It is noted that there is a significant increase in strength of the alloy retaining the ductility when it is aged in the aging temperature regime of 550-650 A degrees C and time of 8 h. Role of higher oxygen content is noted, which is more pronounced with higher severity of quench (by water quenching). Specimens representative of different heat treatment conditions were characterized using optical microscope, electron back-scattered diffraction, and electron microscope. The presence of martensitic (alpha') structure along with uniform distribution of fine primary alpha, secondary alpha precipitates and refined beta-grains, twins in the microstructure helps in improving the strength of the material. Also, during high temperature aging of 700 A degrees C, which incidentally falls in the range of annealing temperature of the alloy, overaging occurs which is similar to effect of annealing and hence retains the ductility as well.
Genre Article
Topic HEAT-TREATMENT
Identifier JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE,25(4)1492-1501