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Preparation method of large-size corrosion-resistant Ti35 alloy forge piece

A large-size, forging technology, applied in the field of preparation of large-size corrosion-resistant Ti35 alloy forgings, can solve the problems of increased alloy heating times, high-temperature oxidation material loss, difficulty in ensuring sufficient deformation of the core of the forging, and long processing cycles, etc., to reduce heating and forging cost, reduce high temperature oxidation material loss, and improve production efficiency

Active Publication Date: 2021-04-23
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two processes can guarantee the uniformity of structure and mechanical properties to a certain extent, but there are problems such as long processing cycle and high cost to varying degrees.
Multi-pass small deformation forging can improve the yield of forgings, but this forging process is only suitable for small-sized forgings, and it is difficult to ensure sufficient deformation of the core of forgings for large-sized forgings
At the same time, multi-pass small deformation forging will cause excessive heating times of the alloy, resulting in increased high-temperature oxidation material loss

Method used

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  • Preparation method of large-size corrosion-resistant Ti35 alloy forge piece
  • Preparation method of large-size corrosion-resistant Ti35 alloy forge piece
  • Preparation method of large-size corrosion-resistant Ti35 alloy forge piece

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Step 1. High-temperature billet forging: the Ti35 alloy ingot with a diameter of 720mm is subjected to billet forging at 1025°C with 1 upset and 2 draws to obtain the first forging; the heating coefficient used in the billet forging is 0.7, and the Ti35 The deformation of the alloy ingot in the three directions of 1 upsetting and 2 drawing is 35%, and the deformation speed is 10mm / s;

[0029] Step 2, one-time medium-temperature forging: the first forging obtained in step 1 is forged at 850°C with 1 upsetting and 2 drawing to obtain the second forging, and the hot material is returned to the furnace; the heating coefficient used in the forging is 0.7, and the first The deformation of the forging in the three directions of 1 upsetting and 2 drawing is 35%; the reheating coefficient used for the reheating of the hot material is 0.4;

[0030] Step 3. Low-temperature forging: Forging the second forging with the hot mate...

Embodiment 2

[0035] This embodiment includes the following steps:

[0036] Step 1. High-temperature billet forging: Carry out billet forging of Ti35 alloy ingot with a diameter of 650mm at 1000°C for 1 upset and 2 draws to obtain the first forging; the heating coefficient used in the billet forging is 0.6, Ti35 The deformation of the alloy ingot in the three directions of 1 upsetting and 2 drawing is 30%, and the deformation speed is 10mm / s;

[0037] Step 2, one-time medium-temperature forging: the first forging obtained in step 1 is forged at 800°C with 1 upsetting and 2 drawing, to obtain the second forging and to carry out hot material refurbishment; the heating coefficient used in the forging is 0.6, the first The deformation of the forging in the three directions of 1 upsetting and 2 drawing is all 30%; the reheating coefficient used for the reheating of the hot material is 0.3;

[0038] Step 3. Low-temperature forging: Forging the second forging with the hot material back to the fur...

Embodiment 3

[0043] This embodiment includes the following steps:

[0044] Step 1. High-temperature billet forging: Carry out billet forging of Ti35 alloy ingot with diameter φ of 720mm at 1050°C with 1 upset and 2 draws to obtain the first forging; the heating coefficient used in the billet forging is 0.8, Ti35 The deformation of the alloy ingot in the three directions of 1 upsetting and 2 drawing is 40%, and the deformation speed is 10mm / s;

[0045] Step 2, one-time medium-temperature forging: the first forging obtained in step 1 is forged at 900°C with 1 upsetting and 2 drawing to obtain the second forging, and the hot material is returned to the furnace; the heating coefficient used in the forging is 0.8, and the first The deformation of the forging in the three directions of 1 upsetting and 2 drawing is 40%; the reheating coefficient used for the reheating of the hot material is 0.5;

[0046] Step 3. Low-temperature forging: Forging the second forging with the hot material back to th...

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Abstract

The invention discloses a preparation method of a large-size corrosion-resistant Ti35 alloy forge piece. The method comprises the steps of 1, performing high-temperature blooming forging on a Ti35 alloy cast ingot to obtain a first forge piece; 2, performing primary medium-temperature forging on the first forge piece to obtain a second forge piece; 3, performing low-temperature forging on the second forge piece to obtain a third forge piece; 4, performing secondary medium-temperature forging on the third forge piece to obtain a fourth forge piece, and forming to obtain a formed forge piece; and 5, performing short-time annealing heat treatment on the formed forge piece, and obtaining the Ti35 alloy forge piece after air cooling. According to the method, a high-temperature forging process, a medium-temperature forging process, a low-temperature forging process and a medium-temperature forging process are sequentially adopted for the Ti35 alloy cast ingot, and medium-temperature annealing is combined, so that as-cast coarse grains are refined by improving the recrystallization degree of the forge piece, the structure uniformity of the Ti35 alloy forge piece is improved, then the size of the Ti35 alloy forge piece is increased, and the urgent requirements of the Ti35 titanium alloy large-size forge piece for components, structure uniformity and the flaw detection grade A requirement at present are met.

Description

technical field [0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to a method for preparing a large-scale corrosion-resistant Ti35 alloy forging. Background technique [0002] Ti35 titanium alloy is a new type of titanium alloy for boiling concentrated nitric acid corrosion environment. It has excellent corrosion resistance, crevice corrosion performance and strong oxide film regeneration ability, showing better performance than high-purity austenitic stainless steel. Corrosion resistance and adaptability, so Ti35 titanium alloy has become a candidate material for key equipment used in nuclear spent fuel reprocessing engineering. [0003] At present, the main forging processes of existing titanium alloy forgings are cooling forging, isothermal forging and multi-pass small deformation forging. Zhang Changjiang and others carried out cooling forging and solution aging heat treatment on near-β titanium alloys, and prepared tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21J5/06B21J5/08B21J1/06C22F1/18C21D1/26
CPCY02W30/50
Inventor 吕智丹吴金平赵恒章张于胜赵恺姬坤海李欢
Owner 西安稀有金属材料研究院有限公司
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