Forging method for improving microstructure uniformity of TC18 titanium alloy bars

A technology of TC18 and uniform structure, which is applied in the field of forging to improve the uniformity of the structure of TC18 titanium alloy rods, can solve the problems of many times of forging process and poor structure uniformity of the rods, so as to improve the structure uniformity, shorten the production cycle, The effect of reducing the risk of deformation texture

Active Publication Date: 2016-05-25
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a forging method to improve the uniformity of the structure of TC18 titanium alloy rods, which solves the problems of the traditional TC18 titanium alloy forging process with too many fires and the poor structure uniformity of the forged rods.

Method used

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  • Forging method for improving microstructure uniformity of TC18 titanium alloy bars
  • Forging method for improving microstructure uniformity of TC18 titanium alloy bars
  • Forging method for improving microstructure uniformity of TC18 titanium alloy bars

Examples

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Effect test

Embodiment 1

[0031] Preparation of Φ160 specification TC18 titanium alloy bar:

[0032] Heat the ingot of TC18 titanium alloy to 1150°C, the heating coefficient of the ingot is 0.70, carry out 1 fire upsetting and drawing forging, the forging ratio is controlled at 1.70, the pressing process requires uniform pressing, and the pressing speed is 20mm / s, Break the original as-cast structure, so that the macroscopic grain size of the ingot is broken to 10mm; the completed forging billet is subjected to 2 times of upsetting and drawing above the β transformation point: the forging billet is heated to 990°C, and the forging billet is single-fired The amount of deformation is 35%, and the cumulative deformation is 70%. Among them, the heating coefficient of the cold material in the first fire is 0.70. After the second fire forging, it is continuously returned to the furnace, and the heating coefficient is 0.35. The uniform speed is slow and the reduction rate is controlled at 20mm / s, so that the ...

Embodiment 2

[0034] Preparation of Φ200 specification TC18 titanium alloy bar:

[0035] Heat the TC18 titanium alloy ingot to 1170°C, the heating coefficient of the ingot is 0.80, carry out 1 fire upsetting and drawing forging, the forging ratio is controlled at 1.80, the pressing process requires uniform pressing, and the pressing speed is 22mm / s, Break the original as-cast structure, so that the macroscopic grain size of the ingot is broken to 13mm; the completed forging billet is subjected to two times of upsetting and drawing above the β transformation point: the forging billet is heated to 995°C, and the forging billet is single-fired The amount of deformation is 40%, and the cumulative deformation is 73%. Among them, the heating coefficient of the cold material in the first fire is 0.80, and the continuous furnace is used after the fire forging, the heating coefficient is 0.4, the uniform speed is slow, and the reduction rate is controlled at 22mm / s, so that the macroscopic grain siz...

Embodiment 3

[0037] Preparation of Φ210 specification TC18 titanium alloy bar:

[0038]The TC18 titanium alloy ingot is heated to 1190°C, the heating coefficient of the ingot is 0.85, and the upsetting and drawing forging is carried out once, and the forging ratio is controlled at 1.90. The pressing process requires uniform pressing, and the pressing speed is 24mm / s. Break the original as-cast structure, so that the macroscopic grain size of the ingot is broken to 17mm; the completed forging billet is subjected to three times of upsetting and drawing above the β transformation point: the forging billet is heated to 1000 ° C, and the single fire forging billet The amount of deformation is 42%, and the cumulative amount of deformation is 77%. Among them, the heating coefficient of the cold material in the first fire is 0.85. After the second fire forging, the continuous furnace is used, the heating coefficient is 0.42, the uniform speed is slow, and the reduction rate is controlled at 24mm / s...

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Abstract

The invention discloses a forging method for improving the microstructure uniformity of TC18 titanium alloy bars. The method comprises the following steps: heating TC18 titanium alloy ingots, carrying out upsetting and rolling forging once, and pressing down the forged ingots in a downward pressing process to crush an original cast microstructure; and carrying out upsetting and rolling forging on the obtained forging stock at a temperature being greater than a beta phase transition point 2-3 times, carrying out upsetting and rolling forging on the obtained forging stock at a temperature being smaller than the beta phase transition point 2-4 times to prepare a 16-surface object, and carrying out precise forging on the 16-surface object at a temperature of Tbeta-50DEG C once to finally produce TC18 titanium alloy bars with the diameter of 160-260mm. The method improves the microstructure uniformity of the TC18 titanium alloy bars and effectively reduces the deformation microstructure risk through adopting a less upsetting and rolling + high control precision precise forging technology on the premise of guaranteeing the refinement and fragmentation of the microstructure; and the method reduces the production cost and the quality risk and shortens the production period of the bars through reducing the forging frequency and adopting continuous melting, and is suitable for large-scale batch production of the TC18 titanium alloy bars.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a forging method for improving the microstructure uniformity of TC18 titanium alloy rods. Background technique [0002] TC18 titanium alloy, whose nominal composition is Ti-5Al-5Mo-5V-1Cr-1Fe, belongs to a multi-component β titanium alloy. Its performance characteristics are high strength, high toughness, and high hardenability. Its forgings are usually quasi-β forging . Its strength can be as high as 1200MPa through heat treatment, and it is widely used in various large structural parts of aircraft and spacecraft. Its good weldability is also manufactured into wire, which can be used as welding wire. The alloy is a nearly β-type high-hardenability titanium alloy, and its deformation resistance is large, which easily leads to a large cumulative deformation of the core; the thermal conductivity of the alloy is low, and the core is prone to overheat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 崔林林李少强何涛尚金金雷锦文杜予晅丁永峰王涛刘广发郝芳刘向宏冯勇
Owner 西部超导材料科技股份有限公司
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