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-Extracted 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...

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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.

Technology Topic

Single phaseMicrostructure +6

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Examples

Experimental program(1)

Example Embodiment

[0043] Example two (Φ1200mm*600mm cake blank)

[0044] Step 1. Billet forging:

[0045] Use an electric furnace to heat the Φ650~780mm Ti55531 ingot to 300℃ above the β phase transition temperature and keep it for 1500min. After the end, use an 80MN fast forging machine to perform one-shot three-upsetting and three-drawing forging, requiring uniform upsetting, and the upsetting rate is controlled at 10~20mm/s, the upsetting deformation is controlled within 40~50% to break the original as-cast structure;

[0046] Step 2. Intermediate forging:

[0047] Step 2.1. The Ti55531 forging blank completed in step 1 is forged at 300°C above the β phase transition temperature for 4 fires, two upsetting and two draw forging, which includes 2 fires reversing upsetting, and the deformation amount of single fire upsetting is controlled At 40~45%, the upsetting rate is controlled at 10~20mm/s;

[0048] Step 2.2. The forging blank obtained in step 2.1 is subjected to two-fire upsetting forging at 30~50℃ above the β-phase transition temperature, the deformation of single-fire upsetting is controlled at 40~45%, and the upsetting rate is controlled at 10-20mm /s;

[0049] Step 2.3. The forging billet obtained in step 2.2 is subjected to two-fire two-up and two-draw forging at 30~50°C below the β phase transition temperature (four upsetting in total). The square material is upset and drawn into a flat square, and two upset. Two-drawing large and small faces are interchanged, three-upsetting, three-drawing, large and small faces are interchanged, four upsetting and four draws are tetragonal blanks; among them, the first fire is first upsetting to flat square, and then upsetting to flat square (with the previous upsetting The length and width of the flat square are interchanged), the second fire is first upset to a flat square (the length and width are exchanged compared with the flat square of the previous upsetting), and then the upsetting is shaped into a square blank, upsetting The amount of deformation is controlled at 38~42%; the deformation amount of single-fire upsetting is controlled at 38~42%, and the upsetting rate is controlled at 5~10mm/s;

[0050] Step 2.4. The forging blank obtained in step 2.3 is subjected to two-fire two-up and two-draw forging at 30~50℃ above the β-phase transition temperature. The deformation amount of single-fire upsetting is controlled at 40~45%, and the upsetting rate is controlled at 10~20mm/s;

[0051] Step 2.5. The forging blank obtained in step 2.4 is forged at 30~50℃ below the β-phase transition temperature for 4 fires with two upsetting and two drawing forging, and the final drawing length is an octagonal billet, and the deformation of single fire upsetting is controlled at 38~42 %, the upsetting rate is controlled at 5~10mm/s;

[0052] Step 2.6. The forging blank obtained in step 2.5 is subjected to two rounds of one-uping and one-drawing upsetting spheronization forging at 30~50℃ below the β phase transition temperature, and the deformation of single-fire upsetting is controlled at 30-40%, and the upsetting The speed is controlled at 5~10mm/s;

[0053] Step 3. Finished forging:

[0054] The forging blank obtained in step 2 is subjected to one-shot upsetting and shaping forging at 30-50°C below the β phase transition temperature, and the amount of upsetting deformation is controlled at 30-40% to deform to a suitable cake blank;

[0055] Step 4. Heat treatment

[0056] The cake blank obtained in step 3 is subjected to overall heat treatment, and the heat treatment system is: T β -40℃~T β -10℃, 1h~4h, furnace cooling to 700℃~750℃, heat preservation 2h~6h, air cooling +500℃~650℃, heat preservation 4h~8h, then air cooling.

[0057] The Ti55531 cake blank prepared by the above steps has small structural differences in all directions and excellent mechanical properties. The results are shown in Table 3 and Table 4.

[0058] Table 3 Contact method flaw detection results of Ti55531 alloy Φ1200mm large-size cake blank produced by this patented process

[0059] Flat bottom hole

[0060] Table 4 The mechanical properties of the Ti55531 alloy Φ1200mm large-size cake blank produced by the patented process

[0061]

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce anisotropy

Method for producing large-specification Ti55531 alloy pancake

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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