考虑应变-温度耦合与高温动态结晶的钛合金本构模型研究

张铭; 刘献礼; 岳彩旭; Steven Y.LIANG; 李恒帅; 刘智博

doi:10.13433/j.cnki.1003-8728.20200263

考虑应变-温度耦合与高温动态结晶的钛合金本构模型研究

doi: 10.13433/j.cnki.1003-8728.20200263

1.
哈尔滨理工大学先进制造智能化技术教育部重点实验室，哈尔滨　150080
2.
佐治亚理工学院乔治·W·伍德拉夫机械工程学院，美国亚特兰大　30332

基金项目: 黑龙江省自然科学基金优秀青年项目（YQ2019E029）

详细信息

作者简介:
张铭（1995−），硕士研究生，研究方向为材料本构模型的二次开发，钛合金铣削有限元仿真，1540165525@qq.com

通讯作者:
刘献礼，教授，博士生导师，xlliu@hrbust.edu

中图分类号: TG146.2
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- 文章访问数: 409
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-18
- 网络出版日期: 2021-11-19
- 刊出日期: 2021-11-05

Study on Constitutive Model for Titanium Alloy by Coupling Strain-temperature and Dynamic Crystallization

1.
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China
2.
The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332, USA

摘要

摘要: Ti-6Al-4V合金的高速切削加工是一个复杂的高温高应变率的热力耦合过程，为更加准确研究Ti-6Al-4V合金在高温高应变率下的真实应力-应变关系，构建了一种修正Johnson-Cook（J-C）本构模型。修正的J-C本构模型综合考虑了塑性阶段应变硬化率会随加载温度的升高而降低的现象，以及在达到高温动态结晶效应的临界温度时，Ti-6Al-4V合金的流动应力会急剧下降的现象。基于修正J-C本构模型的流动应力-应变预测结果与试验数据吻合程度良好，误差率在8%以内，准确的反映了Ti-6Al-4V合金在不同加载温度下的真实应力-应变关系。
- Ti-6Al-4V合金 /
- 应变硬化率 /
- 再结晶 /
- 本构模型
Abstract: The high-speed machining of Ti-6Al-4V alloy is a complicated thermal coupling process with high temperature and high strain rate. In order to study the true stress-strain relationship of Ti-6Al-4V alloy at high temperature and high strain rate, a modified Johnson-cook (J-C) constitutive model was constructed. The modified J-C constitutive model considers that the strain hardening rate will decrease with the increasing of temperature in the plastic phase and that the flow stress of Ti-6Al-4V alloy will decrease sharply when the critical temperature of high temperature dynamic crystallization effect is reached. The predicted flow stress-strain results via modified J-C constitutive model are in a good agreement with the test data, and the error rate is within 8%, which accurately reflects the true stress-strain relationship of Ti-6Al-4V alloy at different loading temperatures.
- Ti-6Al-4V /
- strain hardening rate /
- recrystallize /
- constitutive model

HTML全文

图 1 Ti-6Al-4V合金在1 400 s⁻¹应变率、室温~ 1 000 ℃下的真实应力-应变曲线

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图 2 Ti-6Al-4V合金在室温 ~ 1 000 ℃下J-C本构模型预测与真实应力应变关系的对比

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图 3 Ti-6Al-4V合金应变硬化率与加载温度的关系

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图 4 不同应变下流动应力随温度的变化

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图 5 25 ~ 1000 ℃温度下修正前后J-C本构模型预测曲线与真实应力应变曲线的对比

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图 6 不同温度时修正前后J-C本构方程的预测误差率

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表 1 Ti-6Al-4V合金的J-C本构模型的参数^[23]

A/MPa	B/MPa	n	C	m
997.5	653.1	0.45	0.019 8	0.7

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表 2 Ti-6Al-4V合金的修正J-C本构模型的参数

A/MPa	B/MPa	n	C	m	r	$\overline {\left( {\dfrac{{{\sigma _b}}}{{{\sigma _a}}}} \right)} $
998	651.9	0.450	0.0195	0.7	0.085	0.75

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表 3 修正前后J-C本构方程预测值与实验数据对比

温度/ ℃	应变	${\sigma _E}/{\rm{MPa}}$	${\sigma _{JC}}/{\rm{MPa}}$	${\sigma _{MJC}}/{\rm{MPa}}$	${\varDelta _1}/\text{%}$	${\varDelta _2}/\text{%}$
200	0.10	1120.08	1056.32	1071.22	5.71	4.37
	0.15	1150.25	1094.93	1105.58	4.81	3.88
	0.20	1172.84	1265.55	1134.91	7.90	3.23
	0.25	1220.31	1295.36	1182.10	6.15	3.13
600	0.10	752.23	827.65	700.83	10.01	6.83
	0.15	768.56	854.43	741.95	11.18	3.46
	0.20	783.25	873.22	772.66	11.43	1.35
	0.25	807.89	897.16	758.15	12.03	6.16
1000	0.10	305.52	423.47	305.79	38.61	2.47
	0.15	302.31	440.76	315.60	45.80	4.40
	0.20	300.97	492.71	323.73	63.71	7.56
	0.25	299.48	506.61	325.81	70.30	7.92

下载: 导出CSV

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