Effects of Interstitial Elements on the Fracture of Beta

本研究旨在明确间隙元素即氧、氮、碳和氢在β钛合金中的作用。合金中氧、氮、碳的含量取决于熔炼时的原料和气氛，但氢是例外，即在冷加工时被吸收到合金中。这可能是因为β相具有大的氢溶解度。氢极大地抑制亚稳β相分解为α和β相。通常β钛合金对氢脆不太敏感，例如，在典型的商业β钛合金Ti-15 V-3Cr-3Sn-3Al中，在100 ppm至1000 ppm氢含量范围内不发生氢脆。在断裂点处，合金中测得的氢量大于其他合金。这可能是因为β相具有大的氢溶解度。

This study aims to make clear the role of interstitial elements i.e.oxygen, nitrogen, carbon and hydrogen on beta titanium alloys. Content of oxygen, introgen and carbon of the alloys are determined by raw materials and atmosphere during melting, however, hydrogen is exceptional i.e.absorbed into the alloys during cold-working. This would be because beta phase has large hydrogen solubility. Hydrogen greatly suppresses the decomposition of metastable beta phase to alpha and beta phases. In general bata titanium alloys are not so sensitive to hydrogen embrittlement, for example, in the one of typical commercial beta titanium alloys Ti-15V-3Cr-3Sn-3Al, hydrogen embrittlement does not occur in the range of from 100ppm to 1000ppm hydrogen content. At the break point larger amount of hydrogen is measured in the alloy than in other alloys. It is probably because beta phase has large solubility of hydrogen.