Manipulation of microstructure and mechanical properties during dehydrogenation of hydrogen-sintered Ti-6Al-4V

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:764

Article

Dunstan, Matthew K.^1,2  Paramore, James D.^1,2  Fang, Z. Zak¹  Sun, Pei¹ 

[1] Univ Utah, Dept Met Engn, 135 South 1460 East Room 412, Salt Lake City, UT 84112 USA

[2] US Army, Met Branch, Res Lab, FCDD RLW MF, 6300 Rodman Rd, Aberdeen Proving Ground, MD 21005 USA

关键词: Titanium alloys;    Phase transformation;    Powder methods;    Hydrogen;    Graded microstructure;    Tensile properties;   

DOI  :  10.1016/j.msea.2019.138244

来源: Elsevier

【 摘 要 】

Ti-6Al-4V parts produced using the powder metallurgy process known as hydrogen sintering and phase transformation (HSPT) have been shown to exhibit superior mechanical properties than those produced using traditional titanium powder metallurgy techniques. In this work, the dehydrogenation step of HSPT is investigated as an additional method to further manipulate the microstructure of Ti-6Al-4V. By varying the dehydrogenation temperature, several microstructural features can be controlled, such as a lathe & colony width and grain boundary a thickness. Furthermore, it is shown that the addition of hydrogen to Ti-6Al-4V greatly reduces the 13 transus temperature, which allows for super-transus processing to occur at reduced temperatures. This reduced beta transus temperature also provides a method by which a graded microstructure can be formed, which consists of a coarse-grained core and a fine-grained shell.

【 授权许可】

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