Hot Compression Deformation Behavior and Processing Map of TA15 alloy

Abstract:

Plastic deformation characteristics and hot processing conditions are important bases for the selection of processing parameters of extrusion and rolling of titanium alloy.The compressive deformation behavior and microstructure of TA15 alloy were investigated at temperature range of 850~1050℃ and strain rate range of 0.01~20 s-1.The constitutive equation of TA15 alloy was derived through Arrhenius hyperbolic sine function.Based on dynamic materials modeling(DMM), the processing map of TA15 alloy was established for strain of 0.1~0.7.The results show that α phase in the alloy gradually transforms to β phase with the increase of deformation temperature. The transform extent of α phase to β phase gradually reduces with the increase of the strain rate. According to processing map, the two hot processing safety areas of the alloy were determined: (1) deformation temperature 950~1050℃, strain rate 0.01~0.37 s-1; (2) deformation temperature 875~950℃, strain rate 1.65~13.5 s-1.

Key words:TA15 alloy; thermal simulation experiment; flow stress; dynamic recrystallization; processing map