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Cobalt-chromium-nickel multi-element casting alloy and preparation method thereof

A technology for casting alloys and multi-component alloys, which is applied in the field of powder metallurgy, can solve the problems of unexamined and applied, ultrasonic flaw detection, inclusion flaw wave height, and lack of ability to extrude large-sized bars of powder superalloy, and achieve casting. The effect of small organization, short process and high preparation efficiency

Inactive Publication Date: 2021-06-01
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country began to develop powder superalloys in the 1980s. Although the performance of the developed powder superalloys meets the requirements of international standards, it has not been assessed and applied because the ultrasonic flaw detection inclusions (inclusions axial accumulation) damage wave is higher than the American standard.
Moreover, our country currently does not have the ability to extrude large-size powder superalloy bars and large-scale isothermal forging equipment protected by inert gas (or vacuum). The lack of key equipment has become an extrusion + isothermal forging process route. and production bottlenecks

Method used

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  • Cobalt-chromium-nickel multi-element casting alloy and preparation method thereof
  • Cobalt-chromium-nickel multi-element casting alloy and preparation method thereof
  • Cobalt-chromium-nickel multi-element casting alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A method for preparing a cobalt-chromium-nickel multi-component casting alloy, firstly, the preparation of the mixture: according to the mass percentage Co, 62%; Cr, 20%; Ni, 10.9%; Mo, 6%; Fe, 1%; C, 0.1 %. Cr equivalent mass percentage: 27.5%, Ni equivalent mass percentage: 14.4%. Cr equivalent and Ni equivalent are calculated using formulas (1) and (2), respectively.

[0037] Mix the raw materials according to the mass percentage, use ϕ5 and ϕ10 steel balls as grinding balls, the number ratio of ϕ5 and ϕ10 steel balls is 3:1, the ball-to-material ratio is 7:1, use absolute ethanol as the ball milling medium, anhydrous The amount of ethanol used is 0.35:1 (ml / g) for the ratio of alcohol to material; the mixture is mixed on a planetary ball mill with a rotation speed of 221r / min, forward and reverse rotation for 20min, and a time of 48h. The mixed slurry was dried in an oven at 80°C to obtain the mixed material. The mixture was granulated through a 60-80 mesh screen...

Embodiment 2

[0041]The invention discloses a method for preparing a cobalt-chromium-nickel multi-component casting alloy. A mixture is prepared according to mass percentages of Co, 62%; Cr, 30.9%; Mo, 6%; Fe, 1%; C, 0.1%. Cr equivalent mass percentage: 38.4%, Ni equivalent mass percentage: 3.5%. The preparation and compression molding process of the mixture is the same as in Example 1, and the planetary ball mill mixing process adopts a rotating speed of 260r / min. In the arc melting preparation process, the first melting current value is 400A, and the melting time is 10s. Then turn the alloy over and melt again, the melting current value is 300A, and the melting time is 20s. After cooling, a cobalt-chromium-nickel multi-component casting alloy is obtained.

[0042] image 3 It is the metallographic structure of the obtained cast alloy, which is characterized by cast dendrites, and is analyzed by XRD as α - fcc+ε - hcp duplex alloy. on the dendrite boundary ε - hcp The volume f...

Embodiment 3

[0044] The invention discloses a method for preparing a cobalt-chromium-nickel multi-element casting alloy. A mixture is prepared according to the mass percentages of Co, 62%; Ni, 30.9%; Mo, 6%; Fe, 1%; C, 0.1%. Cr equivalent mass percentage: 7.5%, Ni equivalent mass percentage: 34.4%. The preparation and compression molding process of the mixture are the same as in Example 1. The mixing process of the planetary ball mill adopts a rotating speed of 240r / min, and a ball-to-material ratio of 10:1. In the arc melting preparation process, the first melting current value is 200A, and the melting time is 20s. Then turn the alloy over and melt again, the melting current value is 300A, and the melting time is 20s. After cooling, a cobalt-chromium-nickel multi-component casting alloy is obtained.

[0045] Figure 4 The metallographic structure of the obtained cast alloy has no obvious casting dendrite characteristics, and is a coarse equiaxed crystal structure. Compared with Examp...

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Abstract

The invention relates to a cobalt-chromium-nickel multi-element casting alloy and a preparation method thereof. According to the cobalt-chromium-nickel multi-element casting alloy, a mixture is prepared through a a powder metallurgy method, then a secondary argon arc smelting method is adopted, the first-time smelting current is 300A-400A, and the second-time smelting current is 200-300A. The cobalt-chromium-nickel casting alloy is prepared from Co-Cr-Ni-M-C original powder, wherein M is selected from one or more of Mo, Fe, Si and Mn. Co is adopted to quantify the mass fraction, and the sum of the mass fractions of all alloy elements is 100%. The phase composition and distribution of the alloy are quantitatively controlled through the method of classifying the effects of alloy elements into the Cr equivalent and the Ni equivalent, then the phase composition of the alloy is regulated and controlled through the method of adjusting the contents of the Cr equivalent and the Ni equivalent in original material components, and the compact alloy is obtained through an electric arc melting method.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a cobalt-chromium-nickel multi-component casting alloy and a preparation method thereof. Background technique [0002] Cobalt-chromium-nickel alloy has excellent mechanical properties, wear resistance and biocompatibility, and can be used in dentistry, artificial joint connectors, etc. In addition, cobalt-chromium-nickel alloys also have high high-temperature strength, anti-adhesion and resistance to various forms of corrosion, and are widely used in chemical, oil and gas equipment, gas turbines, aviation and steel industries. [0003] High-cobalt series cobalt-chromium alloys are usually processed by casting or hot forging after casting. However, cast alloys usually have defects such as coarse columnar crystals and shrinkage cavities, which seriously affect the mechanical properties of the alloy, especially the low plasticity and fatigue strength. These defects of cast cobalt-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/02B22F9/04C22B9/20
CPCB22F9/04B22F2009/043C22B9/20C22C1/02C22C19/07
Inventor 石增敏谢镐王杨洋李光宇邓李辰贵戴雷
Owner CHINA THREE GORGES UNIV