A kind of forging process method of tc18 titanium alloy large-scale bundled bearing forgings

Abstract

A forging process method for a TC18 titanium alloy large-scale bundled support forging, the steps of which are: (1) multi-fire forging to make a billet: (1) ingot forging; (2) multi-fire reversing upsetting deformation; ( 3) Bar forging; (4) Blank preparation; (2) Hot die forging: (1) Die preheating; (2) Forging main body forming; (3) Forging forming optimization; (3) Forging heat treatment and detection analysis: (1) Machining before heat treatment; (2) Double annealing heat treatment; (3) Detection and analysis. The multi-fire forging of the invention increases the forgeability and uniformity of the structure of the intermediate blank, and the quasi-beta hot die forging obtains a relatively ideal basket structure and excellent comprehensive performance of the TC18 titanium alloy.

Description

technical field [0001] The invention relates to the technical field of thermal processing and forming, in particular to a forging process method of a TC18 titanium alloy large binding support forging. Background technique [0002] my country's aerospace model products are developing in the direction of large-scale, the requirements for lightweight structures are getting higher and higher, and the requirements for materials are constantly improving. The binding support is a key load-bearing component in the rocket body structure. It is used to connect the rocket core stage and the booster. In the early days, the binding support was mostly made of high-strength steel alloy. As the demand for rocket weight reduction becomes more and more urgent, it has gradually been adopted in recent years. High-strength titanium alloy replaces high-strength steel materials. The nominal chemical composition of TC18 titanium alloy is Ti-5Al-5Mo-5V-1Cr-1Fe, which is a α-β type two-phase titaniu...

AI Technical Summary

Problems solved by technology

The phase transition point of TC18 titanium alloy is low, the deformation resistance in the two-phase area is large, the forgeability of large-sized billets is relatively difficult, and the uniformity of the bar structure is not easy to ensure. , the weight of the intermediate billet is nearly 2 tons, which intensifies the difficulty of controlling the uniformity of the billet during the preparation process

Due to the complex shape of forgings, many edges and corners, and poor filling performance of titanium alloy, there are problems of poor filling or even missing corners in some positions during hot die forging

In addition, the product design index requirements are high, and the longitudinal mechanical properties require Rm≥1080MPa, Rp0.2≥1010MPa, A≥8%, Z≥20%, aKU≥25J / cm2, and its low-magnification structure and high-magnification structure must meet GJB2744A- Organizational rating requirements in 2007, there are certain technical challenges for oversized forgings of bundled supports

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