Effects of Interstitial Elements on the Fracture of Beta

间隙元素对β断裂的影响

• 批准号: 05650667
• 负责人: NIWA Naotake
• 金额: $ 1.6万
• 依托单位: Kogakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650667/
• 关键词: beta titanium alloys; fracture; hydrogen embrittlement; hydride; interstitial elements; beta phase; solubility; alpha phase; β型チタン合金; 水素; ベータ型チタン合金; 時効; 酸素

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.

本研究旨在明确间隙元素氧、氮、碳和氢对β钛合金的作用。合金中氧、氮和碳的含量由原材料和熔化过程中的气氛决定，但氢是例外，即在冷加工过程中被吸收到合金中。这是因为β相具有大的氢溶解度。氢极大地抑制了亚稳态β相分解为α和β相。一般来说，贝塔钛合金对氢脆不太敏感，例如，在一种典型的商业贝塔钛合金Ti-15V-3Cr-3Sn-3Al中，氢含量在100ppm至1000ppm范围内不会发生氢脆。在断裂点处，该合金中测得的氢量比其他合金中的氢量多。这可能是因为β相具有较大的氢溶解度。

项目成果

K.アルフアソウ固溶度:

K.阿尔法溶解度：