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Second structure strengthening based austenitic alloy and preparation method thereof

An austenitic and cobalt-based alloy technology, applied in the field of powder metallurgy, can solve the problems that the two phases cannot coordinate deformation well, reduce material plasticity, and cannot form a perfect coherent relationship, so as to achieve short sintering time, increase matrix strength, The effect of high density

Active Publication Date: 2018-10-19
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different crystal structures of ferrite and austenite, a perfect coherent relationship cannot be formed at the interface of the two phases. Under the condition of stress deformation, the two phases cannot coordinate deformation well, thus greatly reducing the plasticity of the material.

Method used

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  • Second structure strengthening based austenitic alloy and preparation method thereof
  • Second structure strengthening based austenitic alloy and preparation method thereof
  • Second structure strengthening based austenitic alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fe-chromium-nickel alloy powder (composition: Fe-19.21Cr-10.34Ni-0.84Si-0.25Mn-0.024C) with a purity greater than 99.9% and a particle size of 50-150 μm and a purity greater than 99.9% and a particle size of 120-200 μm The cobalt-based alloy powder (the composition is Co-29Cr-4.4W-1.1Ni-1.1Si-1.1C-0.2Fe), according to the mass ratio of 1:1, was put into a mortar, stirred evenly for 0.5h, and weighed Take 80g of uniformly mixed powder and put it into a graphite mold, heat up at a rate of 50°C / min, hold at 1100°C for 10min, press at 50MPa, and vacuum at 8Pa for spark plasma sintering. austenitic alloys. Its tensile strength at room temperature is 970MPa, and its elongation after fracture is 24.67%.

[0023] like figure 1 As shown, it shows that the interface between the cobalt-based alloy and the iron-chromium-nickel alloy is well bonded, and there is no obvious interface defect.

[0024] like figure 2 As shown, it shows that the strength of the prepared austenitic a...

Embodiment 2

[0027] Fe-chromium-nickel alloy powder (composition: Fe-19.21Cr-10.34Ni-0.84Si-0.25Mn-0.024C) with a purity greater than 99.9% and a particle size of 50-150 μm and a purity greater than 99.9% and a particle size of 120-200 μm The cobalt-based alloy powder (the composition is Co-29Cr-4.4W-1.1Ni-1.1Si-1.1C-0.2Fe), according to the ratio of 3:1 by mass, was put into a mortar and stirred evenly for 1h. Weigh 80g of uniformly mixed powder and put it into a graphite mould, heat up at a rate of 50°C / min, hold at 1150°C for 5min, pressure 50MPa, and vacuum 8Pa for discharge plasma sintering, and obtain a product based on the second Austenitic alloys strengthened by similar structures. Its tensile strength at room temperature is 800MPa, and its elongation after fracture is 56.83%.

Embodiment 3

[0029] Fe-chromium-nickel alloy powder (composition: Fe-19.21Cr-10.34Ni-0.84Si-0.25Mn-0.024C) with a purity greater than 99.9% and a particle size of 50-150 μm and a purity greater than 99.9% and a particle size of 120-200 μm The cobalt-based alloy powder (composition is Co-29Cr-4.4W-1.1Ni-1.1Si-1.1C-0.2Fe, according to the ratio of mass ratio 3:1, put into the mortar, stir evenly for 1h. Weigh 80g and mix The uniform powder is put into a graphite mold, the heating rate is 50°C / min, and the temperature is kept at 1000°C for 20 minutes, the pressure is 30MPa, and the vacuum degree is 8Pa, and discharge plasma sintering is carried out. Austenitic alloy. Its tensile strength at room temperature is 627MPa, and its elongation after fracture is 31.75%.

[0030] like image 3 As shown, it shows that the strength of the new austenitic alloy is higher than that of the iron-chromium-nickel alloy, and it has better plasticity.

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Abstract

The invention relates to a second structure strengthening based austenitic alloy, which comprises the following chemical components by mass percentage: 50-75 of Fe-Cr-Ni alloy powder and 25-50 of Co based alloy powder. The preparation method of the austenitic alloy mainly includes: mixing the Fe-Cr-Ni alloy powder with the Co based alloy powder evenly; loading the alloy powder into a graphite die,conducting spark plasma sintering under a pressure of 30-50MPa and a temperature of 1000-1150DEG C, and controlling the heating rate at 50DEG C / min, the sintering heat preservation time at 5-20min, and the sintering vacuum degree at less than or equal to 8Pa, and then performing furnace cooling, thus obtaining the second structure strengthening based austenitic alloy. The method provided by the invention has the characteristics of simple process, short flow, low production cost, energy saving and environmental protection. The prepared austenitic alloy not only has good room temperature strength and plasticity, but also can maximumly avoid performance deterioration caused by crystal grain growth.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to an austenitic alloy and a preparation method thereof. Background technique [0002] As a new type of production process, powder metallurgy has been paid more and more attention by people. Due to its unique advantages, it has become the key to solve many problems of new materials. At present, in the field of powder metallurgy, the methods for strengthening and toughening austenitic alloys mainly include adding second-phase strengthening particles, in-situ generation methods, and preparing nanocrystals. [0003] Although the addition of the second phase strengthening particles can effectively improve the strength and high temperature stability of the austenitic alloy, but because the strengthening phase is mostly brittle phase, it cannot coordinate deformation with the matrix very well, and the interface between the strengthening phase and the matrix is ​​often crack init...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02B22F1/00B22F3/105C22C19/07C22C38/02C22C38/04C22C38/40
CPCB22F1/0003B22F3/105B22F2003/1051C22C19/07C22C33/006C22C33/02C22C33/0207C22C33/0285C22C38/02C22C38/04C22C38/40
Inventor 付瑞东任亚飞
Owner YANSHAN UNIV
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