Effects of Interstitial Elements on the Fracture of Beta

本研究旨在明确氧、氮、碳、氢等间隙元素在β钛合金中的作用。合金中氧、氮、碳的含量是由原材料和熔化时的气氛决定的，而氢的含量是特殊的，即在冷加工时被合金吸收。这是因为相有很大的氢溶解度。氢极大地抑制亚稳相分解为α相和β相。一般贝塔钛合金对氢脆不那么敏感，例如典型的商用贝塔钛合金Ti-15V-3Cr-3Sn-3Al，在100ppm ~ 1000ppm的氢含量范围内不发生氢脆。在断裂点处，合金中测量到的氢量比其他合金中要大。这可能是因为β相对氢的溶解度大。

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.