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Preparation method of high-strength iron-cobalt-nickel alloy

An iron-cobalt-nickel alloy and high-strength technology, which is applied in the field of preparation of high-strength iron-cobalt-nickel alloys, can solve the problems of small output and high preparation cost, and achieve the effects of high density, uniform grain size and high strength

Active Publication Date: 2019-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the traditional smelting method, the alloy prepared by mechanical alloying often has better properties, but due to the problems of small output and high preparation cost, there is no report on the preparation of high-strength iron-cobalt-nickel alloy by mechanical alloying method.

Method used

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  • Preparation method of high-strength iron-cobalt-nickel alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Weigh 54g of iron powder, 58.8g of cobalt powder, and 58.2g of nickel powder, then mix the powder and add 9g of n-heptane for ball milling. The ball milling parameters were set as ball-to-material ratio 12:1, the ball mill speed was 300rpm, the ball milling time was 60h, and the ball milling was carried out under high-purity argon atmosphere.

[0024] 2. Put the ball-milled alloy powder into a high-temperature hydrogen reduction furnace for reduction at 800°C for 2 hours, and the reduced powder is quickly vacuum-packaged.

[0025] 3. Perform SPS sintering on the reduced powder, the sintering temperature is 1100°C, the pressure is 50MPa, and the holding time is 6min

[0026] 4. Cover the sintered sample with a stainless steel sheath, heat the sample to 900°C and start hot rolling, the final rolling temperature is 750°C, and the rolling deformation is 80%.

[0027] 5. The hot-rolled alloy was heat-treated at 950° C. for 12 hours under the protection of high-purity arg...

Embodiment 2

[0030] 1. Weigh 60g iron powder, 55.5g cobalt powder, 55.5g nickel powder, then mix the powder and add 15g n-heptane for ball milling. The ball milling parameters were set as ball-to-material ratio 10:1, ball mill speed 350rpm, ball milling time 72h, and ball milling was carried out under high-purity argon atmosphere.

[0031] 2. Put the ball-milled alloy powder into a high-temperature hydrogen reduction furnace for reduction at 700°C for 2.5 hours, and the reduced powder is quickly vacuum-packaged.

[0032] 3. Perform SPS sintering on the reduced powder, the sintering temperature is 1000°C, the pressure is 60MPa, and the holding time is 8min

[0033] 4. Cover the sintered sample with a stainless steel sheath, heat the sample to 1000°C and start hot rolling, the final rolling temperature is 750°C, and the rolling deformation is 70%.

[0034] 5. The hot-rolled alloy was heat-treated at 900° C. for 24 hours under the protection of high-purity argon, and then air-cooled to room ...

Embodiment 3

[0037] 1. Weigh 60g of iron powder, 52.3g of cobalt powder, and 59g of nickel powder, then mix the powder and add 1.8g of stearic acid for ball milling. The ball milling parameters were set as a ball-to-material ratio of 15:1, a ball mill speed of 350 rpm, and a ball milling time of 48 hours. The ball milling was carried out under a high-purity argon atmosphere.

[0038] 2. Put the ball-milled alloy powder into a high-temperature hydrogen reduction furnace for reduction at 900°C for 1.5 hours, and the reduced powder is quickly vacuum-packaged.

[0039] 3. The reduced powder is sintered by hot isostatic pressing at a temperature of 1200° C. and a pressure of 100 MPa for 3 hours.

[0040] 4. Cover the sintered sample with a stainless steel sheath, heat the sample to 900°C and start hot rolling, the final rolling temperature is 750°C, and the rolling deformation is 80%.

[0041] 5. The hot-rolled alloy was heat-treated at 1050° C. for 18 hours under the protection of high-purity...

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Abstract

The invention provides a preparation method of a high-strength iron-cobalt-nickel alloy and relates to the field of preparation of a high-strength alloy material. The preparation method comprises thesteps of firstly, weighing iron powder, cobalt powder and nickel powder according to a certain mass ratio; secondly, mixing the above powder and conducting ball milling under inert gas shielding to realize alloying; thirdly, conducting sintering molding on the alloyed powder through spark plasma sintering or hot isostatic sintering and conducting hot rolling or hot extrusion on sintered samples; and finally, removing stress through heat treatment and homogenizing the structure to obtain the high-strength iron-cobalt-nickel alloy. The iron-cobalt-nickel alloy prepared through the method is uniform in structure, has the average grain diameter being about 300 nm and the strength higher than 700 Mpa and is superior to an iron-cobalt-nickel alloy prepared through a smelting method.

Description

technical field [0001] The invention belongs to the field of preparation of iron-cobalt-nickel alloy materials, in particular to a preparation method of high-strength iron-cobalt-nickel alloy. Background technique [0002] Iron-cobalt-nickel ternary alloy is an important transition metal alloy, which has excellent magnetic properties and physical and chemical properties, such as high saturation magnetization, low thermal expansion coefficient, good corrosion resistance and high surface brightness [Zhan Jing, Yan Xin, Li Changjun, et al. Research progress in the preparation of iron-cobalt-nickel ternary alloys[J]. Metal Materials and Metallurgical Engineering, 2010,38(2):49-53.], but its strength is low, largely It limits its application [Anonymous. Iron-cobalt-nickel alloy with good low-temperature thermal expansion and high strength [J]. Metal Materials and Metallurgical Engineering, 1999 (6): 45.]. Iron-cobalt-nickel alloys are generally prepared by traditional smelting m...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/00C22C30/00C22C33/02C22C38/10
CPCC22C1/0433C22C19/00C22C30/00C22C33/0285C22C38/105
Inventor 常永勤李明洋郭远航李吴铭
Owner UNIV OF SCI & TECH BEIJING
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