<strong>TC2</strong>钛合金的高温热变形行为

doi:10.11901/1005.3093.2020.127

材料研究学报

2020, Vol. 34

Issue (12): 892-904 DOI: 10.11901/1005.3093.2020.127

研究论文

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TC2钛合金的高温热变形行为

李沐泽¹^,², 柏春光¹^,²(

), 张志强¹, 赵建¹, 徐东生¹^,², 王岩峰³

^1.中国科学院金属研究所沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016
^3.朝阳金达钛业股份有限公司朝阳 122000

Hot Deformation Behavior of TC2 Titanium Alloy

LI Muze¹^,², BAI Chunguang¹^,²(

), ZHANG Zhiqiang¹, ZHAO Jian¹, XU Dongsheng¹^,², WANG Yanfeng³

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Chaoyang Jinda Titanium Co. , Ltd. , Chaoyang 122000, China

引用本文:

李沐泽, 柏春光, 张志强, 赵建, 徐东生, 王岩峰. TC2钛合金的高温热变形行为[J]. 材料研究学报, 2020, 34(12): 892-904.
Muze LI, Chunguang BAI, Zhiqiang ZHANG, Jian ZHAO, Dongsheng XU, Yanfeng WANG. Hot Deformation Behavior of TC2 Titanium Alloy[J]. Chinese Journal of Materials Research, 2020, 34(12): 892-904.

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摘要:

对TC2钛合金的高温变形行为进行了有限元模拟和热压缩实验研究，使用有限元自洽模型模拟提高流动应力曲线修正精度，分析材料的应力应变曲线特征，得到其高温流动本构方程和激活能，并进行了光学显微镜观察研究其微观组织演变规律，发现在高温低应变速率下α相的球化程度较高。绘制出TC2钛合金的功率耗散图和热加工图，结合应变速率敏感系数m研究了受m值控制的不同变形机制，最终确定了TC2钛合金的最佳加工窗口：(I)760~825℃、0.007~0.024 s^-1；(II)850~900℃、0.018~0.37 s^-1；(III)900~950℃、1~10 s^-1，在此区间功率耗散因子较大，在材料变形过程中发生充分动态再结晶，试样的微观组织呈细小等轴状。

关键词 ：金属材料, TC2钛合金, 热变形行为, 热加工图, 组织演变

Abstract：

The high temperature deformation behavior of TC2 Ti-alloy was investigated by means of finite element simulations and isothermal hot compression tests parallelly. Firstly, the characteristic stress-strain curves of TC2 were analyzed, and the high temperature constitutive equation and activation energy were acquired . Secondly, the microstructure evolution was observed with optical microscope. It was found that the globularization of α-phase is obvious at high temperature and low strain rate. Thirdly, the power dissipation and thermal processing map of TC2 Ti-alloy were drawn. And the deformation mechanism was characterized by strain rate sensitivity exponent m. Lastly, and the optimized processing window of TC2 Ti-alloy was determined as: (I) 760~825℃, 0.007~0.024 s^-1; (II) 850~900℃, 0.018~0.37 s^-1; and (III) 900~950℃, 1~10 s^-1. Within these ranges the power dissipation rate of TC2 Ti-alloy is significant and sufficient dynamic recrystallization occurs in the process of deformation.

Key words： metallic materials TC2 titanium alloy hot deformation processing map microstructural evolution

收稿日期: 2020-04-17

ZTFLH:

TG146

基金资助:国家重点研发计划(2017YFB0306201)

作者简介: 李沐泽，男，1994年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.127 或 https://www.cjmr.org/CN/Y2020/V34/I12/892

图1 实验用样品的原始组织

表1 实验用TC2钛合金的实际成分

图2 热模拟压缩实验过程示意图

图3 在压缩实验过程中试样温度的变化

图4 用插值法修正应力(ε=0.4，ε˙=1 s-1)

图5 用插值法和方程法温度修正后流动应力曲线对比

图6不同修正方法模拟结果的比较

图7 在相同应变速率、不同温度条件下TC2钛合金的流动应力曲线

图 8 在相同温度、不同应变速率条件下TC2钛合金的流动应力曲线

图9 在700℃、0.1 s-1条件下数值模拟(应变分布)和实验结果的比较

图10 在700℃、0.1 s-1条件下不同变形区域材料的微观组织

图11 同一应变速率(1 s-1)不同温度的金相组织

图12 在同一温度(750℃)不同应变速率的金相组织

图13 lnε˙-lnσ，lnε˙-σ，lnε˙-lnsinhασ关系曲线

图14 lnsinhασ-1000T关系曲线

图15 lnZ-lnsinhασ关系曲线

图16 计算值与实验值的比较

图17 TC2钛合金的应变速率敏感系数m图

图18 TC2钛合金的功率耗散图

图19 TC2钛合金的热加工图

图20 应变速率对初生α相体积分数的影响

图21 变形温度对初生α相体积分数的影响

图22 TC2钛合金的热加工图中对应不同区域组织的形貌

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