| Summary: | 碩士 === 國防大學理工學院 === 兵器系統工程碩士班 === 101 === ABSTRACT
This study aims to investigate the correlation of hydrogen loading, microstructural evolution, phase transformation, hardness and corrosion resistance of β solution treated (1050℃/30min/FC) Ti-6Al-4V alloy following thermal hydrogenation processing (THP) at 600℃under related hydrogen loading (0.1, 0.3, 0.5, 0.6, 0.7 and 0.9 H/M, *H/M indicating the ratio of hydrogen to Ti-6-4 atoms during THP).
It appears that the grain refinement can be readily achieved by enhanced H/M value of THP. It appears that the refined α phase is actually composed of α and ill defined area within α, so are the β phase being composed of ill defined area with β phase after THP process. As a result, the outer original larger grain boundary still remains associated with many cut and isolated α, β phases containing ill defined regines as a boundary of α or β phase .Furthermore, The newly formed α2-Ti3Al can play the similar role to isolate the original α or β phase than producing more interfaces in Ti-6-4 matrix. The mechanism of ill defined area formation and the influence the content of hydrogen during THP on microstructure evolution are discussed.
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