Dynamic Phase Transformation during Hot-Forging Process of a Powder Metallurgy &amp;alpha;+&amp;beta; Titanium Alloy

Liu, B.; Matsumoto, Hiroaki; Li, Y. P.; Koizumi, Yuichiro; Liu, Y.; Chiba, Akihiko

doi:10.2320/matertrans.m2012042

Cited by 9 publications

(1 citation statement)

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“…[ 1,2 ] The optimization of their properties by tuning the chemical composition (dictating both the β‐transus and the martensite start, M s , temperatures) and the hot deformation conditions, in particular the strain rate and the deformation temperature with respect to the β‐transus temperature, has been an active research topic for several decades, [ 3–6 ] in particular for dual‐phase alloys. [ 7,8 ] The deformation mechanisms and microstructural evolutions of existing commercial dual‐phase titanium alloys are relatively well documented. [ 9 ] Gupta et al have studied the evolution of microstructure and texture in Ti‐15V‐3Cr‐3Sn‐3Al alloy during cold‐rolling and cross‐rolling; it was found that the strain path has a strong effect on the deformation microstructure.…”

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confidence: 99%

The Modeling of the Flow Behavior Below and Above the Two‐Phase Region for Two Newly Developed Meta‐Stable β Titanium Alloys

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Zwaag

2020

Adv Eng Mater

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Isothermal hot compression tests of two promising new titanium alloys (Ti‐10 V‐1Fe‐3Al and Ti‐10 V‐2Cr‐3Al) are performed using a TA DIL805D deformation dilatometer at temperatures in and above the two‐phase α + β region (730–880 °C) at strain rates ranging from 10−3 to 10−1 s−1. Results show that the flow stress of the two alloys decreases with increasing deformation temperature and decreasing strain rate. Some of the flow curves manifest clear discontinuous yielding and flow softening, both of which are strongly affected by the deformation conditions. The flow stress behavior of these two alloys can be described very well by a hyperbolic–sine Arrhenius equation. When deforming in the α + β phase region, the deformation mechanism is governed by the bending or globularization of the α phase. When deforming in the pure β phase field, the flow behavior is mainly determined by dynamic recovery or recrystallization. The difference in alloy composition has a minor effect on their hot working behavior.

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