Effects of Hydrogen Treatment on Microstructure and Hardness of TC4 Alloy

Tian Xuefeng; Ding Hua; Chen Jing

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Effects of Hydrogen Treatment on Microstructure and Hardness of TC4 Alloy
Vol. 31, Issue 7, Pages: 604-607(2011)
Published： 2011 ，
DOI：

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[1]田学锋,丁铧,陈静.氢处理对TC4合金微观组织及硬度的影响[J].特种铸造及有色合金,2011,31(07):604-607.

Tian Xuefeng, Ding Hua, Chen Jing. Effects of Hydrogen Treatment on Microstructure and Hardness of TC4 Alloy. [J]. Special Casting & Nonferrous Alloys 31(7):604-607(2011)
[1]田学锋,丁铧,陈静.氢处理对TC4合金微观组织及硬度的影响[J].特种铸造及有色合金,2011,31(07):604-607. DOI：

Tian Xuefeng, Ding Hua, Chen Jing. Effects of Hydrogen Treatment on Microstructure and Hardness of TC4 Alloy. [J]. Special Casting & Nonferrous Alloys 31(7):604-607(2011) DOI：

摘要

利用光学显微镜、X射线衍射仪和透射电镜研究了TC4合金氢处理后的微观组织变化

通过硬度测试分析了氢处理对TC4合金硬度的影响。结果表明

随着置氢量的增加

置氢后的TC4合金中出现了马氏体α′和氢化物δ

但除氢后的试样中只有α和β两相。TC4合金经过置氢再除氢后

微观组织细化

这是由于除氢时相互平行的共析产物（δ+α）发生了相变和马氏体发生了分解。随着置氢量的增加

除氢后TC4合金的硬度增加

这是TC4合金微观组织细化的结果。

Abstract

Microstructure variation of TC4 alloy after hydrogen treatment was investigated by optical microscope （OM）

X-ray diffraction （XRD） and transmission electron microscope （TEM）. Effects of hydrogen content on hardness of TC4 alloy were researched by hardness testing. The results show that martensite α′ and hydride δ appear in the TC4 alloy after hydrogenation treatment with increase of hydrogen content

while only α and β phase existed in the alloy after dehydrogenation. Microstructure is refined in the alloy after hydrogenation and dehydrogenation treatment

which is attributed to the transformation of eutectoid （δ+α）

in which the δ phase parallel to the α phase

and the decomposition of martensite α′. Hardness of the TC4 alloy is increased with the increase of hydrogen content after hydrogenation treatment as a result of microstructure refinement in the alloy.