氢处理对TC4合金微观组织及硬度的影响  

Effects of Hydrogen Treatment on Microstructure and Hardness of TC4 Alloy

作　　者：田学锋[1] 丁铧[1] 陈静[1] 

机构地区：[1]东北大学材料与冶金学院

出　　处：《特种铸造及有色合金》2011年第7期604-607,共4页Special Casting & Nonferrous Alloys

基　　金：国家安全重大基础研究项目(2007CB613800)

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。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.

关 键 词：氢处理 TI-6AL-4V合金 氢化物 硬度 

分 类 号：TG146.23[一般工业技术—材料科学与工程]