Effects of Back Pressure Factors on Titanium Alloy by Equal Channel Angular Extrusion

Han Xiongwei; Chen Zuhong

doi:10.15980/j.tzzz.2015.08.008

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Effects of Back Pressure Factors on Titanium Alloy by Equal Channel Angular Extrusion
Vol. 35, Issue 8, Pages: 810-812(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.08.008

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[1]韩雄伟,陈祖红.钛合金等通道转角挤压中背压因素的影响[J].特种铸造及有色合金,2015,35(08):810-812.

Han Xiongwei, Chen Zuhong. Effects of Back Pressure Factors on Titanium Alloy by Equal Channel Angular Extrusion. [J]. Special Casting & Nonferrous Alloys 35(8):810-812(2015)
[1]韩雄伟,陈祖红.钛合金等通道转角挤压中背压因素的影响[J].特种铸造及有色合金,2015,35(08):810-812. DOI： 10.15980/j.tzzz.2015.08.008.

Han Xiongwei, Chen Zuhong. Effects of Back Pressure Factors on Titanium Alloy by Equal Channel Angular Extrusion. [J]. Special Casting & Nonferrous Alloys 35(8):810-812(2015) DOI： 10.15980/j.tzzz.2015.08.008.

摘要

研究了钛合金等通道转角挤压中背压因素的影响。结果表明

随着背压增大

试样通过模具底部转角的外圆角逐渐减小

变形更加均匀

并且随着背压的增大

所需挤压载荷增大

对模具及挤压设备要求提高。温度场总体变化不大

在底部区域温度场较无背压时均匀。试样底部的最大等效应变也随着背压的增大而逐渐增加

但背压过大会造成等效应变分布不均。最大主应力随着背压的增大而减少

降低了试样表面的开裂倾向。

Abstract

Effects of back pressure on ECAE Ti alloy were investigated.The results show that with the increase of the back pressure

the deformation uniformity of the samples is improved as a result of decrease of outer-round angle

meanwhile

the loading is increased

which increases the requirement of mould and extruding equipment.The temperature field at the whole sample exhibits slightly change

and it becomes more uniform at the bottom compared with that with absence of back pressure.The maximum equivalent strain at the bottom sample is increased with the backpressure increases gradually

however

excessive back pressure can cause strain uneven distribution.The maximum principal stress is decreased with the pressure increase

which reduces effectively the crack tendency of specimen surface.