马氏体TiAl合金的热变形行为

doi:10.13251/j.issn.0254-6051.2022.10.010

金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 58-64.DOI: 10.13251/j.issn.0254-6051.2022.10.010

马氏体TiAl合金的热变形行为

邢晨, 程亮, 朱彬, 陈逸

江苏理工学院材料工程学院, 江苏常州 213000

收稿日期:2022-05-06 修回日期:2022-08-11 出版日期:2022-10-25 发布日期:2022-12-15
通讯作者: 程亮,副教授,博士,E-mail:chengliang525@163.com
作者简介:邢晨(1995—),男,硕士研究生,主要研究方向为钛铝合金的热变形行为,E-mail:439689728@qq.com。
基金资助:
国家自然科学基金(51905233,5210130372);江苏理工学院研究生实践创新计划(XSJCX20_38)

Hot deformation behavior of martensite TiAl alloy

Xing Chen, Cheng Liang, Zhu Bin, Chen Yi

School of Materials Engineering, Jiangsu University of Technology, Changzhou Jiangsu 213000, China

Received:2022-05-06 Revised:2022-08-11 Online:2022-10-25 Published:2022-12-15

摘要/Abstract

摘要： 为研究马氏体TiAl合金的热变形行为,对Ti-42.1Al-8.3V合金进行1320 ℃油淬,得到马氏体,然后利用Gleeble-1500D热模拟试验机研究了马氏体在变形温度为1000~1150 ℃、应变速率为0.001~1 s^-1下的热变形行为。利用背散射电子成像(BSE)和背散射衍射(EBSD)研究了热变形参数对TiAl合金显微组织的影响,通过分析真应力-真应变曲线,结合双曲正弦方程建立了本构方程。结果表明,马氏体TiAl合金的流变应力曲线符合动态再结晶特征,峰值应力随着变形温度的降低和应变速率的增大而增大;通过计算得到n为2.175,变形激活能Q为595.79 kJ/mol,并构建了马氏体TiAl合金的本构方程;在热变形后,TiAl合金中近等边三角形排布的马氏体转变成α₂/γ片层结构。随着变形温度的升高和应变速率的减小,α₂/γ片层逐步被再结晶晶粒替代,最后在变形温度为1100 ℃、应变速率为0.001 s^-1条件下全部转化为等轴晶。另外,随着应变速率的降低和变形温度的升高,晶粒充分长大,逐渐粗化。

关键词: TiAl合金, 马氏体, 热变形, 本构方程, 显微组织

Abstract: In order to study the hot deformation behavior of martensite TiAl alloy, Ti-42.1Al-8.3V alloy was oil-quenched at 1320 ℃ to obtain martensite structure, and then hot deformed compressively at deformation temperature of 1000-1150 ℃ and strain rate of 0.001-1 s^-1 by using Gleeble-1500D thermal-mechanical simulator. The effect of hot deformation parameters on microstructure of the Ti-42.1Al-8.3V alloy was studied by means of BSE and EBSD, and the constitutive equation was established according to the true stress-true strain curves of the tested alloy and the hyperbolic sine equation. The results show that the flow stress curves of the alloy conform to the dynamic recrystallization characteristics, and the peak stress increases with the decrease of deformation temperature and the increase of strain rate. The constitutive equation of the tested alloy with martensitic structure is established, in which the calculated n value is 2.175, and the deformation activation energy Q is 595.79 kJ/mol. After hot deformation, the martensite arranged in equilateral triangles transforms into α₂/γ lamellar structure. With the increase of deformation temperature and the decrease of strain rate,the lamellar α₂/γ is replaced by recrystallized grains gradually, and completely transforms into equiaxed grains at deformation temperature of 1100 ℃ and strain rate of 0.001 s^-1. In addition, with the decrease of strain rate and the increase of deformation temperature, the grains grow fully and gradually coarsen.

Key words: TiAl alloy, martensite, hot deformation, constitutive equation, microstructure

中图分类号:

TG146.23

邢晨, 程亮, 朱彬, 陈逸. 马氏体TiAl合金的热变形行为[J]. 金属热处理, 2022, 47(10): 58-64.

Xing Chen, Cheng Liang, Zhu Bin, Chen Yi. Hot deformation behavior of martensite TiAl alloy[J]. Heat Treatment of Metals, 2022, 47(10): 58-64.

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马氏体TiAl合金的热变形行为

Hot deformation behavior of martensite TiAl alloy

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