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A kind of multidirectional forging method of nickel-rich nickel-titanium intermetallic compound

An intermetallic compound, multi-directional forging technology, applied in metal processing equipment and other directions, can solve the problems affecting the service life of materials and market promotion, material bonding defects, powder oxidation pollution, etc., to reduce stress, solve difficult, organizational problems uniform effect

Active Publication Date: 2022-07-12
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powder metallurgy not only has many processes, long construction period, and high cost, but also has problems such as the powder is easily oxidized and polluted, and there are bonding defects inside the material after hot isostatic pressing, which affects the service life and market promotion of the material.

Method used

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  • A kind of multidirectional forging method of nickel-rich nickel-titanium intermetallic compound
  • A kind of multidirectional forging method of nickel-rich nickel-titanium intermetallic compound

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment includes the following steps:

[0023] Step 1, coating the surface of a 60NiTi round ingot with a diameter of 160mm with KBC-12 anti-oxidation coating, and then drying and dewatering treatment at 100° C. for 2h; the mass content of Ti in the 60NiTi round ingot is 41.0%;

[0024] Step 2, heating the 60NiTi round ingot after drying and dewatering treatment in step 1 to 1050 °C for 5 hours, then furnace cooling to 800 °C for 5 hours, and then furnace cooling to 400 °C for air cooling;

[0025] Step 3: Coating the surface of the 60NiTi round ingot after air cooling in step 1 with asbestos with a thickness of 1mm, then heating to 1000°C for 160min;

[0026] Step 4: Preheat the hammer head of the hydraulic forging machine to 200° C., then place the 60NiTi round ingot after heating and heat preservation in step 3 in the hydraulic forging machine for upsetting and axial deformation to obtain a 60NiTi billet; The first reduction of upsetting is 8%, the second re...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] Step 1, coating the surface of a 60NiTi round ingot with a diameter of 100mm with KBC-12 anti-oxidation paint, and then drying and dewatering at 200° C. for 1 hour; the mass content of Ti in the 60NiTi round ingot is 39.0%;

[0032] Step 2, heating the 60NiTi round ingot after drying and dewatering treatment in step 1 to 900 °C for 8 hours, then furnace cooling to 800 °C for 4 hours, and then furnace cooling to 450 °C for air cooling;

[0033] Step 3: Coating the surface of the 60NiTi round ingot with air cooling in step 1 with asbestos with a thickness of 2mm, then heating to 950°C for 100min;

[0034] Step 4: Preheat the hammer head of the hydraulic forging machine to 300° C., then place the 60NiTi round ingot after heating and heat preservation in step 3 in the hydraulic forging machine for upsetting and axial deformation to obtain a 60NiTi billet; The first reduction of upsetting is 10%, the second reduction is...

Embodiment 3

[0038] This embodiment includes the following steps:

[0039] Step 1. Coat the surface of the 60NiTiHf raw material bar with a side length of 70 mm with KBC-12 anti-oxidation coating, and then perform drying and dewatering treatment at 150 ° C for 1.5 hours; the mass content of Ni in the 60NiTiHf raw material bar is 56.0 %, the mass content of Hf is 10.0%;

[0040] Step 2, heating the 60NiTiHf raw material bar after drying and dewatering treatment in step 1 to 930°C for 10h, then furnace cooling to 800°C for 2h, and then furnace cooling to 350°C for air cooling;

[0041] Step 3: Coating the surface of the 60NiTiHf raw material bar with a thickness of 3mm after being air-cooled in step 1, and then heating it to 900°C for 70min;

[0042] Step 4: Preheat the hammer head of the hydraulic forging machine to 350°C, and then place the 60NiTiHf raw material bar after heating and heat preservation in step 3 in the hydraulic forging machine for upsetting and axial deformation to obtain...

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Abstract

The invention discloses a multi-directional forging method for nickel-rich nickel-titanium intermetallic compounds. The method comprises: 1. coating a 60NiTi(X) ingot or a 60NiTi(X) raw material bar with an anti-oxidation coating and drying it; 2. After heating and heat preservation, first furnace cooling and heat preservation, and then furnace cooling to below 500 ℃ and air cooling; 3. Heating and heat preservation; 4. Upsetting axial deformation; X) Bars. The invention designs a heat treatment system according to the characteristics of the brittle phase in 60NiTi(X), eliminates the brittle phase in the raw material, reduces the stress in the raw material, and overcomes the problem that 60NiTi(X) is easily brittle during the hot working deformation process. Controlling the temperature and strain rate of multi-phase forging bridges the tiny defects inside the 60NiTi(X) material and refines the grains, realizes the forging shape, and solves the problems of difficult multi-directional forging and easy cracking.

Description

technical field [0001] The invention belongs to the technical field of preparation of intermetallic compounds, in particular to a multidirectional forging method of nickel-rich nickel-titanium intermetallic compounds. Background technique [0002] In 1959, the US Ordnance Laboratory developed a nickel-rich nickel-titanium intermetallic compound Nitinol 60 (weight ratio of Ni and Ti 60:40), the material hardness can reach HRC58-62. However, the material is composed of a variety of intermetallic compounds. Due to the inherent brittleness of intermetallic compounds, it is very difficult to process and shape. The US Ordnance Laboratory abandoned the research and development of this material for more than 40 years. Until 2004, NASA found that the material also has the characteristics of superelasticity, which is very suitable for bearing materials, Nitinol 60 and the corresponding nickel-rich ternary nickel-titanium intermetallic compound 60NiTi-X (X element is Hf, Ta, Zr, Al, N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/06B21J5/08B21J5/00C22C19/03
CPCB21J1/06B21J5/08B21J5/00C22C19/03
Inventor 李磊蔡建华邹磊洪权赵永庆陈军杨海瑛郭荻子赵圣泽
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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