氢辅助气体捕捉法制备泡沫Ti-6Al-4V及其机理研究

对气体捕捉法制备泡沫Ti-6Al-4V过程中未发泡的坯料进行置氢处理,然后再进行等温发泡。运用阿基米德原理对发泡后坯料孔隙率进行测量。通过OM和SEM对坯料内部微观特征进行观察。研究氢对坯料等温发泡过程的影响规律及作用机制。结果表明：质量分数为0.15%的氢能将坯料最佳发泡温度降低60℃,即在890℃下孔隙率可达到32.88%（体积分数）,孔径达到160μm,孔洞分布弥散的泡沫Ti-6Al-4V。主要机理：氢以降低坯料（α＋β）/β相转变温度的方式,提高基体内塑性较好的β相比例,并能在一定程度上软化α相,降低坯料高温流变应力,进而降低最佳发泡温度。...

Full description

Saved in:
Bibliographic Details
Published in材料工程 Vol. 43; no. 11; pp. 1 - 8
Main Author 王哲磊 任学平 侯红亮 王耀奇 逯伟
Format Journal Article
LanguageChinese
Published 北京航空制造工程研究所,北京100024%北京科技大学材料科学与工程学院,北京,100083%北京航空制造工程研究所,北京,100024%山东大学(威海),山东威海,264209 2015
北京科技大学材料科学与工程学院,北京100083
Subjects
气体捕捉法
氢
泡沫Ti-6Al-4V
等温发泡
isothermal foaming
氢
等温发泡
Ti-6Al-4V foam
gas entrapment
气体捕捉法
泡沫Ti-6Al-4V
hydrogen
Online AccessGet full text
ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2015.11.001

Cover

More Information
Summary:对气体捕捉法制备泡沫Ti-6Al-4V过程中未发泡的坯料进行置氢处理,然后再进行等温发泡。运用阿基米德原理对发泡后坯料孔隙率进行测量。通过OM和SEM对坯料内部微观特征进行观察。研究氢对坯料等温发泡过程的影响规律及作用机制。结果表明：质量分数为0.15%的氢能将坯料最佳发泡温度降低60℃,即在890℃下孔隙率可达到32.88%（体积分数）,孔径达到160μm,孔洞分布弥散的泡沫Ti-6Al-4V。主要机理：氢以降低坯料（α＋β）/β相转变温度的方式,提高基体内塑性较好的β相比例,并能在一定程度上软化α相,降低坯料高温流变应力,进而降低最佳发泡温度。
Bibliography:11-1800/TB
The hydrogenated tests of the before-foaming billets were carried out firstly, and then were used to prepare Ti-6Al-4V foams by gas entrapment through isothermal foaming. The porosity was calculated using Archimedes method, and micro-characteristics were observed by OM and SEM. The influence and action mechanism of hydrogen on billets＇ isothermal foaming process to produce Ti-6Al- 4V foams were studied. The results show that hydrogen of mass fraction 0.15% can reduce the bil- lets＇ optimum isothermal foaming temperature by 60℃ ,that is, at 890℃, the Ti-6Al-4V foams can be obtained with porosity of up to 32.88% （volume fraction） , pore size of 160μm, and dispersed pore distribution. The main mechanism is： Hydrogen, by decreasing （α＋β）/β phase transition tempera- ture,improves ductile β phase ratio and can soften the α phase in some degree and reduce the high tem- perature flow stress of billets, and further decreases the optimum isothermal foaming temperature.
Ti-6Al-4V foam ; hydrogen ; isothermal fo
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2015.11.001