一种TC4钛合金及其热处理方法
By combining solution treatment, low-temperature pre-aging, and high-temperature re-aging, the microstructure of TC4 titanium alloy was optimized, solving the problems of high plasticity and low fatigue crack propagation rate in the prior art, and realizing the preparation of high-performance TC4 titanium alloy.
CN117684108BActive Publication Date: 2026-07-17INNER MONGOLIA UNIV OF SCI & TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INNER MONGOLIA UNIV OF SCI & TECH
- Filing Date
- 2023-12-13
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing heat treatment processes for TC4 titanium alloys make it difficult to produce equiaxed materials with high plasticity and low fatigue crack propagation rates, which affects their application in load-bearing structures.
Method used
A combination of solution treatment, low-temperature pre-aging treatment, and high-temperature re-aging treatment was used to control the microstructure of TC4 titanium alloy, forming fine and dispersed primary equiaxed α and β phases, and optimizing its heat treatment process parameters.
Benefits of technology
It significantly improves the elongation and fatigue life of TC4 titanium alloy, reduces the fatigue crack propagation rate, and meets the high-performance requirements of armored vehicle structural components.
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Figure CN117684108B_ABST
Abstract
本发明涉及钛合金抗疲劳性能技术领域，本发明公开了一种TC4钛合金及其热处理方法，包括以下步骤：将TC4钛合金顺次进行固溶处理、低温预时效处理和高温再时效处理后完成对TC4钛合金的热处理；低温预时效处理的温度为255～265℃，低温预时效处理的时间为3～7h；高温再时效处理的温度为545～555℃，高温再时效处理的时间为3～7h。本发明所得TC4钛合金拉伸强度在1100～1200MPa之间，延伸率在15～17％之间，稳态扩展区的平均疲劳裂纹扩展速率在1.5～2.0mm / 104cycles之间，性能较传统固溶时效热处理工艺有很大提升。
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