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Method for producing large-specification Ti55531 alloy pancake

A ti55531, large-scale production technology, applied in the field of titanium alloy forging, can solve the problems of difficulty in obtaining uniform, high fracture toughness, large deformation resistance, etc., achieve good mechanical properties matching, reduce anisotropic difference, and ensure the effect of material strength

Active Publication Date: 2018-01-19
湖南湘投金天钛业科技股份有限公司
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AI Technical Summary

Problems solved by technology

Because the alloy belongs to the nearly β-type titanium alloy, it has the characteristics of low phase transition temperature, high deformation resistance, and poor forgeability.
It is difficult to obtain a uniform microstructure with small anisotropic differences by the traditional single-phase area billet opening + two-phase area upsetting and drawing deformation, and it is also difficult to obtain high fracture toughness

Method used

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  • Method for producing large-specification Ti55531 alloy pancake
  • Method for producing large-specification Ti55531 alloy pancake
  • Method for producing large-specification Ti55531 alloy pancake

Examples

Experimental program
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Effect test

Embodiment 2

[0043] Example 2 (Φ1200mm*600mm cake base)

[0044] Step 1, blank forging:

[0045] Use an electric furnace to heat the Ti55531 ingot with a size of Φ650~780mm to 300°C above the β phase transition temperature, and keep it warm for 1500 minutes. After the end, use an 80MN fast forging machine to perform one fire, three upsetting and three drawing forgings. Upsetting at a uniform speed is required, and the upsetting rate is controlled at 10~20mm / s, the amount of upsetting deformation is controlled at 40~50%, so as to break the original cast structure;

[0046] Step 2, intermediate forging:

[0047] Step 2.1. The Ti55531 forging billet completed in step 1 is subjected to 4 times of double-upsetting and double-drawing forging at 300°C above the β-phase transition temperature, including 2 times of reversing upsetting and drawing, and single-fire times of upsetting and drawing deformation control At 40~45%, the upsetting rate is controlled at 10~20mm / s;

[0048] Step 2.2. The fo...

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Abstract

The invention discloses a method for producing a large-specification Ti55531 alloy pancake. The method comprises the steps of cogging forging, intermediate forging, finished product forging and heat treatment. According to the method for producing the large-specification Ti55531 alloy pancake, a '' high + low + high + low '' forging process route is adopted, forging permeability of a blank is ensured by applying large-tonnage pressure provided by an 80 MN press, deformation of a single-phase area is large, and the deformation of the two-phase area is small; a single-phase area upsetting and drawing deformation is adopted as the main, meanwhile, forging deformation modes such as reversing upsetting and drawing and flat-square upsetting and drawing are introduced, anisotropy difference of materials is greatly reduced, the proper heat treatment is carried out, so that microstructure of the alloy is of a incomplete spheroidization state, the microstructure of the alloy is distinguished from a fully equiaxed structure, a microstructure which can coexist with beta-turn + equiaxed alpha + short rod-shaped alpha is obtained, so that fracture toughness is improved while the strength of thematerial is guaranteed, and good mechanical property matching is achieved.

Description

technical field [0001] The invention relates to the technical field of titanium alloy forging, in particular to a method for producing a large-sized Ti55531 alloy cake, which is used to prepare a large-sized alloy cake with good structure uniformity and good matching of mechanical properties. Background technique [0002] Ti55531 alloy belongs to the nearly β-type high-strength and high-toughness alloy. It is the key material for making large-scale structural parts of aircraft. This alloy has a good matching of strength, plasticity, fracture toughness, and has great significance for the improvement of aircraft performance. Because the alloy belongs to the nearly β-type titanium alloy, it has the characteristics of low phase transition temperature, high deformation resistance, and poor forgeability. It is difficult to obtain a uniform microstructure with small anisotropic difference and high fracture toughness in the traditional single-phase area billet opening + two-phase ar...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 李松强黄德超彭晖陈艳詹孝冬
Owner 湖南湘投金天钛业科技股份有限公司
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