Preparation method of high-strength titanium alloy bar for additional material manufacturing powder

An additive manufacturing, titanium alloy technology, applied in the direction of manufacturing tools, metal processing equipment, heat treatment equipment, etc., can solve the problems of unstable performance of Ti185 alloy rods, high-speed rotating rods breaking and flying out, unstable performance, etc., to achieve sphericity High, high uniformity, good quality effect

Active Publication Date: 2020-12-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing of Ti185 rods is as mentioned above because of its high Fe content, using conventional vacuum consumable arc melting and hot pressure processing methods. Ti185 rods currently on the market have not completely solved the segregation of Fe elements. The problem of β spots occurs, and the high-speed rotating rod often breaks and flies out of this defect, causing safety accidents. After high-magnification scanning of the fracture, it is found that there are a large number of spots at the fracture. The surface scanning composition is Fe, which is Fe. segregated phase, the formation of β spots
Although researchers and pressure processing personnel have worked hard to reduce or eliminate β spots, not every batch can avoid β spots, and some of the same batch have β spots and some do not, and the performance of each batch or the same batch is always Very unstable, resulting in unstable performance of Ti185 alloy rods

Method used

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  • Preparation method of high-strength titanium alloy bar for additional material manufacturing powder
  • Preparation method of high-strength titanium alloy bar for additional material manufacturing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1. Mix the titanium alloy raw materials to obtain a mixture; the titanium alloy raw materials are Fe-80V alloy with a particle size of 3 mm to 5 mm, and Ti-32Fe alloy with a particle size of 3 mm to 5 mm, with a particle size of 3 mm to 5 mm Ti-50Al alloy and titanium sponge with a particle size of 10mm to 30mm;

[0037] Step 2. Put the mixed material obtained in step 1 into a mold and press to obtain an electrode block; the pressing pressure is 60 tons, and the electrode block is a cylindrical electrode block with a cross-sectional diameter of 75 mm;

[0038] Step 3. The electrode block obtained in step 2 is subjected to intermediate frequency induction melting to obtain a cylindrical blank; the process of the intermediate frequency induction melting is as follows: the electrode block is placed in an intermediate frequency induction melting furnace, and the vacuum degree in the furnace is kept at 0.7×10 -3 Pa...

Embodiment 2

[0068] This embodiment includes the following steps:

[0069] Step 1. Mix the titanium alloy raw materials to obtain a mixture; the titanium alloy raw materials are Fe-80V alloy with a particle size of 3 mm to 5 mm, and Ti-32Fe alloy with a particle size of 3 mm to 5 mm, with a particle size of 3 mm to 5 mm Ti-50Al alloy and titanium sponge with a particle size of 10mm to 30mm;

[0070] Step 2. Put the mixture obtained in step 1 into a mold and press it to obtain an electrode block; the pressing pressure is 70 tons, and the electrode block is a cylindrical electrode block with a cross-sectional diameter of 80 mm;

[0071] Step 3. The electrode block obtained in step 2 is subjected to intermediate frequency induction melting to obtain a cylindrical blank; the process of the intermediate frequency induction melting is as follows: the electrode block is placed in an intermediate frequency induction melting furnace, and the vacuum degree in the furnace is kept at 0.9×10 -3 Pa, wi...

Embodiment 3

[0078] This embodiment includes the following steps:

[0079] Step 1. Mix the titanium alloy raw materials to obtain a mixture; the titanium alloy raw materials are Fe-80V alloy with a particle size of 3 mm to 5 mm, and Ti-32Fe alloy with a particle size of 3 mm to 5 mm, with a particle size of 3 mm to 5 mm Ti-50Al alloy and titanium sponge with a particle size of 10mm to 30mm;

[0080] Step 2. Put the mixture obtained in step 1 into a mold and press to obtain an electrode block; the pressing pressure is 50 tons, and the electrode block is a cylindrical electrode block with a cross-sectional diameter of 70 mm;

[0081] Step 3. The electrode block obtained in step 2 is subjected to intermediate frequency induction melting to obtain a cylindrical blank; the process of the intermediate frequency induction melting is as follows: the electrode block is placed in an intermediate frequency induction melting furnace, and the vacuum degree in the furnace is kept at 0.8×10 -3 Pa, heate...

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Abstract

The invention discloses a preparation method of a high-strength titanium alloy bar for additional material manufacturing powder. The method comprises the following steps that firstly, titanium alloy raw materials are mixed to obtain a mixture; secondly, the mixture is pressed to obtain an electrode block; thirdly, the electrode block is subjected to medium-frequency induction melting to obtain a cylindrical blank; fourthly, the cylindrical blank is ground, chamfered and welded to obtain a welded cylindrical blank; fifthly, the welded cylindrical blank is subjected to vacuum consumable arc melting to obtain a cylindrical cast ingot; sixthly, the cylindrical cast ingot is forged to obtain a forged bar; and seventhly, the forged bar is subjected to high-temperature crystallization and low-temperature annealing to obtain the high-strength titanium alloy bar. According to the method, medium-frequency induction melting is matched with vacuum consumable arc melting and high-temperature crystallization, a unique nano-scale hierarchical structure is formed in fine texture of the high-strength titanium alloy bar, it is ensured that beta spots of the high-strength alloy bar are avoided, component uniformity and tensile strength of the high-strength titanium alloy bar are improved, and thus it is ensured that the high-strength titanium ally bar meets the strength requirement of the additional material manufacturing powder.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a method for preparing high-strength titanium alloy rods for powder-making by additive manufacturing. Background technique [0002] The weight of titanium metal is only about 45% of that of low-carbon steel. Due to its high specific strength and excellent corrosion resistance, it is widely used in various industrial fields. Titanium is often mixed with some other metals to further increase its strength. As early as 50 years ago, metallographers began to mix titanium with cheaper iron, vanadium, and aluminum metals to further increase the strength. After long-term research and application experiments by scientists, they have obtained good resistance The Ti-1Al-8V-5Fe alloy (hereinafter referred to as Ti185) with corrosion resistance, high specific strength and good fatigue resistance makes it widely used in aerospace, medical equipment and automobile...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22B9/20C22C14/00C22F1/18C21D9/00B22F9/14B21J5/00
CPCB21J5/002B22F9/14C21D9/0075C22B9/20C22C1/02C22C14/00C22F1/183Y02P10/25
Inventor 李增峰汤慧萍赵少阳谈萍沈垒殷京瓯王利卿葛渊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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