Quantitative Analysis of Dynamic Softening Behaviors Induced by Dynamic Recrystallization for Ti-10V-2Fe-2Al Alloy

Abstract

In order to investigate the effect of dynamic recrystallization (DRX) behavior on dynamic softening behavior of wrought Ti-10V-2Fe-3Al titanium alloy, a series of laboratory scale isothermal hot compression tests with a height reduction of 60% were performed in a temperature range of 948 K∼1023 K in the (s + b) phase field, and a strain rate range of 0.01∼10 s −1 on a Gleeble-3500 thermomechanical simulator. The flow curves show a continuous softening at all strain rate after peak stress. The constitutive equation and the DRX kinetic mold were established to study the dynamic softening based on the flow curves. By the regression analysis for conventional hyperbolic sine equation, the activation energy was determined as Q = 479.4169 kJ·mol −1 , According to the strain hardening rate curves (ds/de versus s ), two characteristic parameters including the critical strain for DRX initiation (e c ) and the strain for peak stress (e p ) were identified, and the linear dependence of the critical strain (e c ) for DRX initiation on the strain for peak stress (e p ) can be specified by the equation: e c = 0.5667e p . A modified Avrami type equa-was introduced to characterize the evolution of DRX volume fraction. The evolution of DRX volume was described as the following: for a fixed strain rate, the strain required for the same amount of DRX volume fraction increases with decreasing deformation temperature, in contrast, for a fixed temperature, it increases with increasing strain rate. Finally, the impact of dynamic recrystallized behavior on degree of dynamic softening became weaker and weaker with the increasing of temperature for the strain rate of 0.01 s −1 , 0.1 s −1 , 1 s −1 and 10 s −1 , due to the volume of a phase decreased with the increasing of temperature.

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

“…It is well known that a comprehensive analysis of flow softening behavior is significant to achieve excellent properties of alloys. In recent years, the flow softening behaviors of magnesium alloys [4,5], titanium alloys [6,7,8,9], aluminum alloys [10,11], and some other alloys [12,13,14] have been investigated.…”

Spark Plasma Sintered High-Entropy Alloys: An Advanced Material for Aerospace Applications

“…Landing gear components are typically manufactured with advanced materials using conventional metallic materials such as aluminum alloy 7075 [22][23][24][25][26][27][28][29][30], alloys steel 4340 [31][32][33][34][35][36], titanium 6Al-4V [37][38][39][40][41][42], titanium 6Al-6V-2Sn [43,44], titanium 15Al-3Cr-3Al-3Sn [45][46][47], and titanium 10Al-2Fe-3V [48][49][50][51][52]. The most versatile titanium alloys in the aerospace industry are titanium 6Al-4V, titanium 6Al-6V-2Sn, titanium 15Al-3Cr-3Al-3Sn, and titanium 10Al-2Fe-3V because of their excellent properties.…”

Precipitation of Secondary Phase and Phase Transformation Behavior of a Solution‐Treated Ti–6Al–4V Alloy during High‐Temperature Aging

“…Usually, the microstructures and mechanical properties of titanium alloys can be effectively regulated by heat treatments, as well as thermomechanical processing . Especially, the aging heat treatment can prominently affect the content, size, and morphology of α phase, which have greatly influences on the strengths of titanium alloys . Therefore, studying the microstructure evolution of titanium alloys during the thermomechanical and aging heat treatments is vital to optimize the microstructures and improve the mechanical properties …”

“…[7][8][9][10][11][12][13][14] Especially, the aging heat treatment can prominently affect the content, size, and morphology of α phase, which have greatly influences on the strengths of titanium alloys. [15,16] Therefore, studying the microstructure evolution of titanium alloys during the thermomechanical and aging heat treatments is vital to optimize the microstructures and improve the mechanical properties. [17][18][19][20] Generally, the microstructures of titanium alloys are significantly influenced by aging heat treatment parameters, [21] such as aging temperature, [22,23] aging time, [21,24,25] and cooling rate.…”