Co-Cr-Mo-N alloy and preparation method thereof

A co-cr-mo-n, alloy technology, applied in the field of metallurgy, can solve the problems of low density, coarse product structure, low efficiency, etc., and achieve the effect of low cost, high production efficiency and simple process

Active Publication Date: 2020-08-14
江苏应用元素科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The casting material has various casting defects, such as hard and brittle precipitates, segregation, shrinkage cavity or air bubbles. The existence of these defects becomes the cause of damage and cracks during processing, resulting in damage to the mechanical reliability of the material
[0003] When Co-Cr-Mo alloys are used in artificial dentures and other fields, they need to be processed into thin rods. Due to the hard and brittle nature of Co-Cr-Mo alloys, the current forming of Co-Cr-Mo alloys The investment casting method is widely used, but the investment casting process is complicated and the efficiency is low, and the casting will lead to coarse structure and low density of the product, which will affect the performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] This embodiment provides a method for preparing a Co-Cr-Mo-N alloy, including the following steps:

[0024] Vacuum melting: vacuum degree ≤10 -2 Pa, smelting temperature 1550~1680°C; after drying, cleaning, degreasing and crushing the cobalt, chromium and molybdenum billet raw materials, add them to the crucible at the same time, and vacuumize until the vacuum degree is ≤10 -2 Pa; heating and melting, the temperature is controlled between 1620~1680 ° C, and the temperature is kept for 3 hours; the composition is adjusted to make the composition of other elements except N element reasonable; chromium nitride is added to meet the composition and uniformity requirements; the temperature is kept for 1 hour, Ingredient detection, control ingredients;

[0025] Vacuum casting: The temperature of the melt is lowered to 1480~1520°C, and after holding for 0.5h, the rod is cast into a rod with a length of 1000mm and a diameter of 60mm in the vacuum casting chamber; when the tempe...

Embodiment approach 2

[0031] This embodiment provides a method for preparing a Co-Cr-Mo-N alloy, including the following steps:

[0032] Vacuum melting: vacuum degree ≤10 -2 Pa, the melting temperature is 1550~1680°C; after drying, cleaning, degreasing and crushing, cobalt-chromium alloy and cobalt-molybdenum alloy are added to the crucible at the same time, and the vacuum is evacuated to a vacuum degree of ≤10 -2 Pa; heating and melting, the temperature is controlled between 1620~1680°C, and kept for 3 hours; the composition is adjusted to make the composition of other elements except N element reasonable; nitrogen is introduced at 1320~1480°C, and held for 3 hours to make it meet the composition and uniformity requirements; heat preservation for 1h, component detection, and control of components;

[0033] Vacuum casting: The temperature of the melt is lowered to 1480~1520°C, and after 0.5h of heat preservation, the rods with a length of 1500mm and a diameter of 80mm are cast in the vacuum castin...

Embodiment approach 3

[0039] This embodiment provides a method for preparing a Co-Cr-Mo-N alloy, including the following steps:

[0040] Vacuum melting: vacuum degree ≤10 -2 Pa, the melting temperature is 1550~1680°C; after drying, cleaning, degreasing and crushing the cobalt-chromium-molybdenum alloy billet raw materials, they are added to the crucible at the same time, and vacuumed to a vacuum degree of ≤10 -2Pa; heating and melting, the temperature is controlled between 1620~1680°C, and kept for 3 hours; the composition is adjusted to make the composition of other elements except N element reasonable; nitrogen is introduced at 1320~1480°C, and held for 3 hours to make it meet the composition Requirements: heat preservation for 1 hour, component detection, and control of components;

[0041] Vacuum casting: The temperature of the melt is lowered to 1480~1520°C, and after 0.5h of heat preservation, the rods with a length of 500mm and a diameter of 50mm are cast in the vacuum casting chamber; when...

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Abstract

The invention relates to the field of material processing and discloses a preparation method of Co-Cr-Mo-N alloy. The preparation method comprises the steps of vacuum melting - vacuum casting - heat treatment - rolling - cutting. The Co-Cr-Mo-N alloy is vacuum melted and cast, heated to the temperature of 1,150-1,350 DEG C and rolled into a star shape, wherein the single rolling amount is 10%-18%,and the finish-rolling diameter is 8-10mm. According to the preparation method, a rolling method is used for processing the Co-Cr-Mo-N alloy to form a slender rod, the processing technology is simple, processing efficiency is effectively improved, a product is fine in structure, a bulky phase is crushed, density is improved, and the mechanical properties of the material are improved.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a Co-Cr-Mo-N alloy and a preparation method thereof. Background technique [0002] Since Co-Cr-Mo alloys have excellent mechanical properties, wear resistance, and corrosion resistance, they are actually used effectively as implant materials for artificial knees, hip joints, and implant materials for dentistry. Its products are mainly made by casting molding. The representative ASTM standard F75 alloy in the Co-Cr-Mo alloy is mainly composed of dendrite structure, and the dendrite structure mainly includes Co-rich γ (F.C.C.) phase, which contains Co and Mo under rich Cr conditions. M23C6 carbide phase and σ phase rich in Cr and Mo. The casting material has various casting defects, such as hard and brittle precipitates, segregation, shrinkage cavity or air bubbles. The existence of these defects becomes the cause of damage and cracks during processing, thus resulting in damage to the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/10C22F1/10
CPCC22C19/07C22C1/1036C22F1/10C22C1/1052
Inventor 陈业高邵国友彭伟平彭剑凌丹斌
Owner 江苏应用元素科技有限公司
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