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Low-cost titanium alloy short-process rolling process

A titanium alloy, short-process technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of limited popularization and application, reduction of comprehensive performance such as welding and fatigue, and high cost of titanium alloy plates, so as to shorten the process flow , eliminate the difference in tissue performance, and inhibit the effect of coarsening

Active Publication Date: 2021-03-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of materials is reduced by adding cheap Fe and Fe-Mo master alloys instead of more expensive elements such as V, which leads to the reduction of comprehensive properties such as welding and fatigue, thus limiting its popularization and application.
[0004] At present, domestic research on low-cost titanium alloy plates is mainly based on multiple vacuum consumable arc melting + billet forging + multiple rolling processes. Therefore, it is urgent to develop low-cost titanium alloy plate short-process rolling technology to solve titanium The bottleneck problem of high cost of alloy plates meets the growing demand for titanium alloy material applications in various fields in China

Method used

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  • Low-cost titanium alloy short-process rolling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concrete steps that adopt the inventive method to prepare the TC4 titanium alloy sheet material that thickness is 5mm are:

[0036] Step 1: The TC4 titanium alloy 200mm thick slab ingot prepared by electron beam cold bed furnace melting that passed the chemical composition inspection is kept in a heating furnace at 90°C above the β transformation point for 180min, and then the first hot rolling is carried out for 6 passes Keep the rolling direction of the first hot rolling as unidirectional rolling, the deformation of each pass is respectively: 15%, 20%, 20%, 25%, 20%, 15%, and then immerse in water and quickly cool to room temperature, Obtaining an intermediate slab with a thickness of 55 mm through surface grinding;

[0037] Step 2: After the first hot-rolled slab described in step 1 is kept in a heating furnace at 35°C below the β transformation point for 70 minutes, the second fire rolling is carried out for 5 passes, and the rolling direction of the first 3 pas...

Embodiment 2

[0043] The concrete steps of the TC4 titanium alloy sheet material that adopts the inventive method to prepare thickness to be 8mm:

[0044] Step 1: The TC4 titanium alloy 220mm thick slab ingot prepared by electron beam cold bed furnace melting that passed the chemical composition inspection was kept in a heating furnace at 120°C above the β transformation point for 200 minutes, and then carried out 7 passes of the first hot rolling Keep the rolling direction of the first hot rolling as unidirectional rolling, the deformation of each pass is: 12%, 15%, 20%, 20%, 20%, 12%, 12%, and then immerse in water for rapid cooling After reaching room temperature, a middle slab with a thickness of 65 mm was obtained through surface grinding.

[0045] Step 2: heat the first hot-rolled slab described in step 1 in a heating furnace at 45°C below the β transformation point for 80 minutes, and then perform 6 passes of second fire rolling, wherein the rolling direction of the first 3 passes is...

Embodiment 3

[0051] The concrete steps of the TC4 titanium alloy sheet material that adopts the inventive method to prepare thickness to be 10mm:

[0052] Step 1: The TC4 titanium alloy 250mm thick slab ingot prepared by electron beam cold bed furnace melting that passed the chemical composition test was kept in a heating furnace at 150°C above the β transformation point for 240min, and then carried out 7 passes of the first hot rolling Keep the rolling direction of the first hot rolling as unidirectional rolling, the deformation of each pass is: 12%, 15%, 20%, 20%, 20%, 12%, 11%, and then immerse in water for rapid cooling After reaching room temperature, a middle slab with a thickness of 75 mm was obtained through surface grinding.

[0053] Step 2: heat the first hot-rolled slab described in step 1 in a heating furnace at 60°C below the β transformation point for 90 minutes, and then perform 4 passes of second fire rolling, wherein the rolling direction of the first 2 passes is It is pe...

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Abstract

The invention relates to a low-cost titanium alloy short-process rolling process. The low-cost titanium alloy short-process rolling process comprises the following steps of: 1, heating a slab ingot smelted by an electron beam cold bed furnace to a temperature above a phase transformation point, carrying out first fire rolling, and carrying out water cooling to obtain a first hot-rolled plate blank; 2, conducting second fire hot rolling to obtain a second hot rolled plate blank; 3, carrying out intermediate recrystallization annealing treatment; 4, conducting third hot rolling to obtain a thirdhot-rolled plate blank; and 5, conducting finished product annealing treatment to obtain the titanium alloy plate blank with the thickness ranging from 4 mm to 12 mm. The low-cost titanium alloy short-process rolling process has the advantages that the operation is easy; the process is stable and controllable; and the slab ingot obtained through an electron beam cold bed furnace smelting method is directly subjected to hot rolling, so that the ingot casting blank making heating number is avoided, the cost is reduced, and meanwhile, the related index requirements of the titanium alloy are met.

Description

technical field [0001] The invention is a low-cost titanium alloy short-flow rolling process, which belongs to the technical field of titanium alloy material processing. Background technique [0002] Due to its high specific strength, high impact resistance, excellent corrosion resistance, high toughness and weldability, titanium alloys are widely used in important industrial fields such as aerospace and ships, especially the new generation of aerospace vehicles. A large number of titanium alloys are used to meet the design and application requirements of high weight reduction, long life and low cost. Titanium alloys are not only used in the aerospace field, but also in the field of weapons such as armored vehicles. The demand for titanium alloys is also increasing. However, the high processing and use costs of titanium alloys have become the main obstacle restricting their expansion. There is an urgent need to develop low-cost titanium alloy materials and their processing ...

Claims

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Application Information

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IPC IPC(8): B21B1/02B21B1/06B21B45/00C22F1/18C21D9/00C22C1/02C22C14/00
CPCB21B1/026B21B1/06B21B45/004C22F1/183C21D9/0081C22C1/02C22C14/00B21B2001/028B21B2201/06
Inventor 商国强朱知寿王新南李明兵
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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