一种新型近β型Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe合金热变形行为

doi:10.11868/j.issn.1001-4381.2018.000273

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摘要采用Gleeble-3800型热模拟试验机对一种新型近β型Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe（质量分数/%）钛合金进行等温恒应变速率压缩实验。变形温度范围为：655~855℃，应变速率范围为：0.001~10s^-1，最大真应变为0.8。根据实验数据，建立了该合金的高温流变应力模型，计算出热变形激活能约为255kJ/mol，并绘制出热加工图。结合热加工图与材料的显微组织分析可知，在高应变速率（1~10s^-1）条件下变形时，在热加工图上表现为材料的功率耗散值（η）低，为失稳区域，易产生绝热剪切带与局部塑性流动、开裂等现象。在应变速率小于0.01s^-1和相变点（T_β）温度以下（655~755℃）进行热变形时，组织变化主要以动态回复为主；在应变速率小于0.01s^-1和T_β以上（755~855℃）进行热变形时，组织发生动态再结晶，且随着温度的升高，新产生的再结晶晶粒逐渐长大。在相变点附近（755~770℃），变形速率为0.001~0.003s^-1区域内变形时，功率耗散值达到最大值，组织发生动态再结晶，该区域为合金热变形的"安全区"。

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	周强
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	于振涛
	崔文芳

关键词 ：钛合金, 热变形, 流变应力模型, 热加工图, 流变失稳

Abstract：The isothermal constant strain rate compression tests of Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe alloy were conducted by Gleeble-3800 simulator. The hot deformation temperature range is from 655℃ to 855℃ and the strain rate range is from 0.001s^-1 to 10s^-1 and the maximum true strain is 0.8. A high temperature flow stress model was built with activation energy of 255kJ/mol according to the experimental results for the alloy and the processing map of alloy was constructed according to DMM model. The metallographic analysis of alloy shows that the alloy exhibits domain of flow localization and adiabatic shear bands and low power dissipation efficiency in the high strain rate(1-10s^-1). The alloy undergoes dynamic recovery in the temperature region of 655-755℃ and the strain rate below 0.01s^-1. The dynamic recrystallization takes place at the strain rate below 0.01s^-1 and in the temperature region of 755-855℃, the original deformed grains and recrystallized grains gradually grow with the increase of temperature. When the temperature is 755-770℃ and the strain rate is 0.001-0.003s^-1, the alloy's power dissipation efficiency reaches the maximum and the recrystallized grain is uniform and fine. These regions can be considered as the optimal parameter range of isothermal compression for the alloy.

Key words： titanium alloy hot deformation flow stress model hot processing map flow instability

收稿日期: 2018-03-18 出版日期: 2019-06-17

中图分类号:

TG146.2+3

通讯作者: 崔文芳(1963-),女,教授,主要从事先进生物钛合金表面改性、腐蚀行为及强韧性研究,联系地址:沈阳市东北大学材料各向异性与织构教育部重点实验室(110004),E-mail:cuiwf@atm.neu.edu.cn E-mail: cuiwf@atm.neu.edu.cn

引用本文:

周强, 程军, 于振涛, 崔文芳. 一种新型近β型Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe合金热变形行为[J]. 材料工程, 2019, 47(6): 121-128.
ZHOU Qiang, CHENG Jun, YU Zhen-tao, CUI Wen-fang. Hot deformation behavior of new type of near β type Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe alloy. Journal of Materials Engineering, 2019, 47(6): 121-128.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000273 或 http://jme.biam.ac.cn/CN/Y2019/V47/I6/121

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