锻态TB6钛合金<i>β</i>相区压缩变形行为和动态再结晶

doi:10.11901/1005.3093.2018.380

材料研究学报

2019, Vol. 33

Issue (3): 218-224 DOI: 10.11901/1005.3093.2018.380

本期目录 | 过刊浏览

锻态TB6钛合金β相区压缩变形行为和动态再结晶

欧阳德来,崔霞(

),鲁世强,徐勇

南昌航空大学轻合金加工科学与技术国防重点学科实验室南昌 330063

Hot Compressive Deformation and Dynamic Recrystallization of As-Forged Ti-Alloy TB6 During β Process

Delai OUYANG,Xia CUI(

),Shiqiang LU,Yong XU

National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

引用本文:

欧阳德来,崔霞,鲁世强,徐勇. 锻态TB6钛合金β相区压缩变形行为和动态再结晶[J]. 材料研究学报, 2019, 33(3): 218-224.
Delai OUYANG, Xia CUI, Shiqiang LU, Yong XU. Hot Compressive Deformation and Dynamic Recrystallization of As-Forged Ti-Alloy TB6 During β Process[J]. Chinese Journal of Materials Research, 2019, 33(3): 218-224.

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摘要:

使用圆柱形试样在Thermecmaster-Z型热模拟试验机上进行锻态TB6钛合金β相区的热压缩实验(变形温度950~1100℃，应变速率0.001~1 s^-1)，研究了合金的高温压缩变形和动态再结晶行为。结果表明，这种合金在β相区的变形激活能为246.7 kJ/mol，其热变形机制是动态再结晶，动态再结晶新晶粒的主要形核机制是弓弯形核。当应变速率为0.01~0.1 s^-1、变形温度为<1000℃时动态再结晶的发展比较充分，变形组织明显细化；当变形温度高于1000℃、应变速率低于0.001 s^-1时，动态再结晶的晶粒明显粗化。在动态再结晶的晶粒尺寸D与Z参数之间存在着相关性，其函数关系为D=6.44×10²·Z^-0.1628。

关键词 ：金属材料, 锻态TB6钛合金, β相区, 热变形行为, 动态再结晶

Abstract：

Hot compression tests of the as-forged Ti-alloy TB6 were conducted by means of thermecmaster-Z hot simulation test machine in temperature range of 950~1100^oC with strain rate of 0.001~1 s^-1 aiming to reveal its characters of hot compressive deformation behavior and dynamic recrystallization (DRX). Results show that the deformation activation energy of the alloy in the beta phase region is 246.7 kJ/mol; the deformation mechanism of this alloy in hot deformation is dominated by DRX, and the predominant nucleation mechanism for the growth of new grains of DRX may be ascribed to bulging nucleation. Completely dynamic recrystallization can be reached at strain rate of 0.01~0.1 s^-1 and temperature below 1000^oC, resulting in grain refinement of deformed microstructure. DRX grain coarsening was observed for the alloy deformed at temperatures above 1000^oC and strain rates below 0.001 s^-1. DRX grain size relate to Z parameter, which can be described by a function of D=6.44×10²·Z ^-0.1628.

Key words： as-forged titanium alloy TB6 β process hot compressive deformation behavior dynamic recrystallization

收稿日期: 2018-06-09

ZTFLH:

TG146.4

基金资助:国家自然科学基金(51761029);江西省自然科学基金(20161BAB206108);江西省教育厅科学基金(GJJ160683);轻合金加工科学与技术国防重点学科实验室开放基金(gf201401007)

作者简介: 欧阳德来，男，1977年生，博士，副教授

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图1 锻态TB6钛合金棒材的金相组织

图2 锻态TB6钛合金在不同热变形条件下的应力-应变曲线

图3 在变形温度为825℃、应变速率为0.01 s-1条件下不同应变的金相组织

图4 锻态TB6钛合金在不同热变形条件下的金相组织(ε=1.61)

图5 锻态TB6钛合金在不同变形温度条件下的lnε˙与ln(σp)和lnε˙与σp之间的关系曲线

图6 锻态TB6钛合金的(a) lnε˙和ln(sinh(ασp))及(b) ln(sinh(ασp))和1/T关系

图7 动态再结晶的晶粒尺寸与应变速率和变形温度的关系

图8 动态再结晶的晶粒尺寸D与Z的关系

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