A Forging Method for Obtaining tc18 Forgings with Uniform Basket Structure
A technology of TC18 and mesh basket organization, applied in the field of forging, can solve the problems of difficult control and narrow forging window, and achieve the effect of reducing the difficulty of control and improving the stability of product quality.
Active Publication Date: 2020-09-29
湖南湘投金天钛业科技股份有限公司
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[0005] In view of the above-mentioned problems in the prior art that the quasi-β forging process is difficult to control and the forging window is narrow, the purpose of the present invention is to provide a forging method for obtaining uniform basket structure TC18 titanium alloy forgings, so as to improve the uniform structure and performance of TC18 titanium alloy forgings. stability and quality
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[0017] The technical solutions of the present invention will be further elaborated below in conjunction with specific embodiments.
[0018] Material: TC18, phase transition point: 878°C, finished forging size: □180×270×1260mm, 1260mm direction is streamline direction, main equipment: 45MN fast forging machine, Class II industrial electric furnace and Class III industrial electric furnace. Contrast the production scheme and physical and chemical detection results before and after the application of the present invention below:
[0019] 1. The forging method in the prior art (referred to as scheme one):
[0020] (1) In the temperature range of 845°C, the original Φ400×610mm bar is drawn and shaped to □220×330×1060mm by 2~3 fires in the temperature range of 845°C, and the preparation of TC18 blank is completed. The heating equipment adopts three types of industrial electric furnaces, and the forging equipment adopts 45MN fast forging machine;
[0021] (2) Heat the prepared blan...
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The invention discloses a forging method for obtaining a TC18 titanium alloy forged piece with a uniform basket-weave microstructure. The forging method comprises the steps that a forged TC18 blank ispreheated firstly at 30-50 DEG C below the phase transformation point, then is subjected to heat preservation at 10-30 DEG C above the phase transformation point, and then is quickly air-cooled or water-cooled to the room temperature, and finally, the cooled blank is subjected to hammer forging or die forging at 30-50 DEG C below the phase transformation point to obtain a finished product. According to the forging method, various defects such as coarse-grain bright band, streamline and layering caused by local temperature increasing are avoided, the control difficulty is greatly reduced, andthe product quality stability in the production process is improved.
Description
technical field [0001] The invention relates to the technical field of forging, in particular to a forging method for obtaining a TC18 forging with uniform basket structure. Background technique [0002] TC18 is a high-strength, high-toughness near-β-type titanium alloy developed on the basis of the former Soviet Union's BT22 titanium alloy. Its nominal composition is Ti-5Al-5V-1Cr-1Fe. The alloy not only has good strength, plasticity and toughness matching, but also has good hardenability and weldability, and is widely used in various types of aircraft landing gear, frames, beams and other load-bearing components. [0003] At present, the main method of domestic TC18 forging production is quasi-β forging, that is, after the TC18 billet is made waste in the α+β two-phase region, it is then forged at 5~25°C above the phase transition point, and finally the forging is double annealed to obtain the grain boundary α It is a basket structure with semi-continuous phase and α-phas...
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IPC IPC(8): B21J1/06B21J5/02B21J5/00
Inventor 樊凯詹孝冬黄德超朱雪峰彭晖
Owner 湖南湘投金天钛业科技股份有限公司