Microstructure Control for Attaining Over 2Gpa of Tensile Strength in Beta Titanium Alloys

通过微观结构控制使 Beta 钛合金的拉伸强度达到 2Gpa 以上

• 批准号: 02650512
• 负责人: NIWA Naotake
• 金额: $ 1.09万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650512/
• 关键词: titanium alloy; beta titanium alloy; Ti-15V-3CR-3Sn-3Al; Cold-working; aging; mechanical property; duplex-aging; 冷間加工

The features of the beta titanium alloy Include Its superior cold-formability in the solution-treated state and Its Increased strength after undergoing subsequent aging-treatment. Consequently, the method of aging after cold-forming Is a heat-treatment method which utilizes the features of the beta titanium alloy. The heat-treatment method of aging after cold-working is known to remarkably promote the aging response and fine precipitation of alpha phase in commercial beta titanium alloy. It was reported that, compared with the method of aging without cold-working after solution-treatment, this heat-treatment method Improved the balance between strength and ductility of commercial beta titanium alloy Ti-, 13-llCr-3Al, however, It was considered, - that this heat treatment method reduced ductility while aiming to achieve high strength and that the strength-ductility balance could not be Improved for commercial beta titanium alloy Ti-15V-3Cr-3Sn-3Al. Mechanical properties were studied by tensile test of Ti-15V-3Cr-3Sn-3AI alloy obtained by duplex-aging after cold-swaging, i. e. aging at high temperatures followed by re-aging at a lower temperature. Combinations of short-time aging at 823K, 873K and 923K and re-aging at 673K have greatly Improved the strength-ductility balance of this alloy, realizing high strength with adequate tensile elongation. This duplex-aging process further diminishes the Influence of reduction of cold-swaging on the mechanical properties after aging.

β钛合金合金的特征包括其在溶液处理状态下的出色冷可态性以及随后进行衰老处理后的强度。因此，冷形成后衰老的方法是一种使用β钛合金的特征的热处理方法。众所周知，冷工作后的衰老方法可显着促进商业β钛合金中α期的衰老反应和良好的降水。据报道，与溶液处理后没有冷工作的方法相比，这种热处理方法改善了商业β钛合金Ti-，13-llcr-3Al的强度和延展性之间的平衡，但是，这种热处理方法可以降低耐热性，同时降低了固定性的降低，而无法提高强度平衡，并且可以实现高强度的平衡。 TI-15V-3CR-3SN-3AL。通过抗冷 - 机关后通过双链衰老获得的TI-15V-3CR-3SN-3AI合金的拉伸测试研究了机械性能。 e。在高温下衰老，然后在较低的温度下重新衰老。 823K，873K和923K的短时老化的组合以及673K重新衰老的结合极大地改善了这种合金的强度脱牙性平衡，并以足够的拉伸伸长率实现了高强度。这种双链衰老过程进一步减少了衰老后冷射对机械性能的减少的影响。