A method for producing a high fatigue powder metallurgy titanium alloy

By combining cold isostatic pressing and two-stage vacuum sintering with multi-pass hot working and cyclic solution treatment, the problems of insufficient density and coarse grains in titanium alloy preparation are solved, achieving high fatigue strength and stability, and suitable for low-cost preparation of complex-shaped titanium alloy parts.

CN122279299APending Publication Date: 2026-06-26UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Filing Date
2026-04-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing titanium alloy manufacturing processes suffer from insufficient sintering density, abnormal grain growth, compositional segregation, and difficulty in completely eliminating residual porosity, resulting in low material fatigue strength. This makes it difficult to meet the long service life and high reliability requirements of key load-bearing components under extreme conditions such as aerospace and deep-sea equipment.

Method used

By employing cold isostatic pressing combined with a two-stage vacuum sintering process, and through large deformation crushing in the β-phase region and fine processing in the two-phase region, combined with cyclic solution treatment and sub-temperature aging treatment, a fine basket structure is constructed to achieve high density and fine microstructure.

Benefits of technology

The prepared titanium alloy has high density and uniform microstructure, which significantly improves fatigue strength and service stability. It is suitable for complex shaped parts, reduces costs and improves the material's resistance to fatigue damage.

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Abstract

This invention provides a method for preparing high-fatigue powder metallurgy titanium alloys, relating to the technical field of powder metallurgy titanium alloy preparation. The preparation method includes sequential powder forming, vacuum sintering, multi-pass hot working, cyclic solution treatment, and sub-temperature aging. Through the synergistic control of HDH titanium alloy powder vacuum low-temperature sintering, multi-pass hot working in the β-phase and two-phase regions, cyclic solution treatment in the β-phase region, and sub-temperature aging, this invention can effectively eliminate compositional segregation and refine grains while ensuring density, obtaining TC4 titanium alloy with a fine basketweave structure. This results in titanium alloy materials with controllable oxygen content, fine basketweave structure, and excellent mechanical and fatigue properties, suitable for use in key load-bearing components in aerospace and deep-sea equipment. It offers high flexibility, simple operation, wide applicability, and low cost, making it highly suitable for large-scale industrial production.
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