TB6钛合金<i>β</i>区变形的动态再结晶动力学

doi:10.11901/1005.3093.2019.329

材料研究学报

2019, Vol. 33

Issue (12): 918-926 DOI: 10.11901/1005.3093.2019.329

研究论文

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TB6钛合金β区变形的动态再结晶动力学

欧阳德来¹,鲁世强¹,崔霞¹(

),徐勇¹,杜海明²,朱慧安¹

1. 南昌航空大学材料科学与工程学院南昌 330063
2. 江西师范大学南昌 330022

Kinetics of Dynamic Recrystallization of TB6 Ti-Alloy During Hot Compressive Deformation atTemperatures of β-phase Range

Delai OUYANG¹,Shiqiang LU¹,Xia CUI¹(

),Yong XU¹,Haiming DU²,Huian ZHU¹

1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2. Jiangxi Normal University, Nanchang 330022, China

引用本文:

欧阳德来,鲁世强,崔霞,徐勇,杜海明,朱慧安. TB6钛合金β区变形的动态再结晶动力学[J]. 材料研究学报, 2019, 33(12): 918-926.
Delai OUYANG, Shiqiang LU, Xia CUI, Yong XU, Haiming DU, Huian ZHU. Kinetics of Dynamic Recrystallization of TB6 Ti-Alloy During Hot Compressive Deformation atTemperatures of β-phase Range[J]. Chinese Journal of Materials Research, 2019, 33(12): 918-926.

全文: PDF(6086 KB) HTML

摘要:

使用圆柱形TB6钛合金试样在Thermecmaster-Z型热模拟试验机上进行热模拟压缩实验(变形温度为825~1100℃，应变速率为0.001~1 s^-1)。对采集的流变数据进行加工硬化率处理，确定动态再结晶体积分数，研究了TB6钛合金β区变形的动态再结晶动力学。结果表明，流变应力随着变形温度的降低或应变速率的提高而增大，流变曲线呈现出动态再结晶类型的特征。随着应变速率的降低和变形温度的提高，动态再结晶的体积分数和晶粒尺寸增大。在变形温度高于950℃、应变速率低于0.001 s^-1条件下，动态再结晶的晶粒严重粗化。动态再结晶动力学曲线经历缓慢增加—快速增加—缓慢增加三个阶段，呈现出典型的“S”型特征。确定了动态再结晶的体积分数达到50%时的应变，建立了TB6钛合金的动态再结晶动力学模型。

关键词 ：金属材料, TB6钛合金, 加工硬化率, 动态再结晶, 动力学

Abstract：

Hot compression tests of as-forged Ti-alloy TB6 were conducted via thermecmaster-Z hot simulation test machine through rapid heating the alloy up to the temperature range for the presence of β-phase and then compression tests by strain rates of 0.001~1 s^-1 at temperatures in the range of 825~1100℃, while the dynamic recrystallization (DRX) volume fraction were acquired by processing the collected rheological data during compression deformation with work hardening rate approach, then the kinetics of DRX of the alloy deformed at β-phase temperature was studied. The results show that the stress increases with the decrease of deformation temperature or the increase of strain rate, and the stress-strain curves present the type of DRX. With the decrease of strain rate and the increase of deformation temperature, the DRX volume fraction and the grain size of dynamic recrystallization increase. The DRX grain coarsening is observed for the alloy deformed at temperatures above 950℃ and strain rates below 0.001 s^-1. The DRX kinetics curves possess three typical stages: slow increase-fast increase-slow increase, showing a typical "S" type characteristic. Furthermore, the strain corresponding to the presence of 50% DRX volume fraction was determined and the relevant DRX kinetics model of TB6 Ti-alloy is established.

Key words： metallic materials TB6 titanium alloy work hardening rate DRX Kinetics

收稿日期: 2019-07-04

ZTFLH:

TG 146.4

基金资助:国家自然科学基金(51761029);国家自然科学基金(51864035)

作者简介: 欧阳德来，男，1977年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.329 或 https://www.cjmr.org/CN/Y2019/V33/I12/918

图1 TB6钛合金原始棒材的组织

图2 TB6钛合金在不同热变形条件下的应力-应变曲线

图3 锻态TB6钛合金在不同热变形条件下的金相组织(ε=1.61)

图4 动态再结晶和虚拟动态回复时的应力-应变曲线示意图

图5 材料的加工硬化率曲线示意图

图6 TB6钛合金在变形温度为825℃、应变速率为0.001 s-1条件下的应力-应变曲线和θ-σ曲线

图7 TB6钛合金在应变速率为0.001 s-1、变形温度为825℃条件下的应力-应变曲线和动态再结晶动力学曲线

图8 TB6钛合金在应变速率为0.001 s-1不同变形温度条件下的应力-应变曲线

图9 TB6钛合金在应变速率为0.001 s-1不同变形温度条件下的θ-σ曲线

图10 TB6钛合金在应变速率为0.001 s-1不同变形温度条件下的动态再结晶动力学曲线

图11 TB6钛合金在不同热变形条件下的动态再结晶动力学曲线

图12 TB6钛合金在825℃、应变速率为0.01 s-1条件下的动态再结晶动力学曲线

图13 TB6钛合金在不同热变形条件下的动态再结晶ε0.5值

图14 ln[-ln(1-XdRX)]与ln[(ε-εc)/ε0.5]的关系曲线

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