Ti-5523紧固件精密成形与热处理工艺研究

Research on Integrated Process of Precision Forming and Heat Treatment for Ti-5523

摘要

针对新一代航天结构对轻量化、高可靠紧固件的迫切需求，本研究对Ti-5523钛合金紧固件开展精密冷镦成形与热处理一体化工艺研究。通过系统优化冷镦模具型腔半径、成形速度及冲力行程，成功实现了内六角头部一次精密成形。深入探讨了固溶温度、时效温度与保温时间对显微组织及力学性能的影响机理，确立了优化的热处理制度。相较于传统TB3钛合金紧固件，Ti-5523产品在比强度、抗剪切性能及工艺稳定性方面均表现出显著优势，满足高可靠、长寿命航天结构的应用要求。

Abstract

To meet the urgent demand for lightweight and high-reliability fasteners in new-generation aerospace structures, an integrated process of precision cold heading and heat treatment for Ti-5523 titanium alloy fasteners was investigated. One-step precision forming of the internal hexagon head was achieved by systematically optimizing the die cavity radius, forming speed, and ram force stroke. The influence mechanisms of solution temperature, aging temperature, and holding time on the microstructure and mechanical properties were thoroughly investigated. An optimized heat treatment regime was established. Compared with conventional TB3 titanium alloy fasteners, the Ti-5523 products demonstrate significant advantages in specific strength, shear resistance, and process stability, meeting the application requirements for high-reliability and long-life aerospace structures.

关键词

Ti-5523钛合金 / 冷镦成形 / 固溶时效 / 力学性能

Key words

Ti-5523 titanium alloy / Cold heading / Solution and aging treatment / Mechanical properties

参考文献

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