Microstructure Evolution of TC21 Titanium Alloy under Double Annealing

Pan Guangyong; Yu Xinping

doi:10.15980/j.tzzz.2016.02.004

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Microstructure Evolution of TC21 Titanium Alloy under Double Annealing
Vol. 36, Issue 2, Pages: 126-129(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.02.004

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[1]潘光永,余新平.TC21钛合金双重退火组织演变行为研究[J].特种铸造及有色合金,2016,36(02):126-129.

Pan Guangyong, Yu Xinping. Microstructure Evolution of TC21 Titanium Alloy under Double Annealing. [J]. Special Casting & Nonferrous Alloys 36(2):126-129(2016)
[1]潘光永,余新平.TC21钛合金双重退火组织演变行为研究[J].特种铸造及有色合金,2016,36(02):126-129. DOI： 10.15980/j.tzzz.2016.02.004.

Pan Guangyong, Yu Xinping. Microstructure Evolution of TC21 Titanium Alloy under Double Annealing. [J]. Special Casting & Nonferrous Alloys 36(2):126-129(2016) DOI： 10.15980/j.tzzz.2016.02.004.

摘要

针对TC21钛合金

基于JMatPro软件模拟出合金等温转变曲线

并依据等温转变曲线制定合金在热变形后的双重退火热处理制度

并分析其组织演变规律。结果表明

当变形条件一致

合金在不同温度下退火后

组织中析出了片状的α相

随着温度升高

析出的α相尺寸也变大;当退火温度超过相变点后

由于过热原因

组织中形成了魏氏体组织。合金经二次退火后

除了生成网篮组织

还保留了退火前的一些组织特征;最后通过SEM观察合金双重退火后的组织

可知在β基体上析出了形状细小的次生α相

且随着温度的升高尺寸变大

这对合金的组织性能有一定的影响。

Abstract

Time via temperature transformation curve of TC21 was investigated by simulation calculation using JMatPro software.Then the double annealing treatment of TC21 alloy was designed by time-temperature transformation curve.The results show that lamellarαphase is precipitated with the different temperature annealing treatment at a fixed deformation rate.The size ofαphase is increased with the increase of temperature.When the annealing temperature exceeds the phase transition point

Widmanstatten structure appears in the microstructure as a result of over-heating.The TC21 titanium alloy can not only generate the basket network structure but also retain some characteristics before annealing after secondary annealing.By observing the alloy microstructure after double annealing

fine sub-secondaryαphase is precipitated in theβmatrix

and the size of sub-secondaryαphase is increased with the temperature increase

which plays a certain role in microstructure and mechanical properties of the TC1 alloy.