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Method for improving intermetallic compounds in casting alloys

A technology of intermetallic compounds and casting alloys, which is applied in the field of improving intermetallic compounds in casting alloys, can solve problems such as material brittle fracture, achieve the effects of reducing the number, improving comprehensive mechanical properties, refining and uniform distribution

Active Publication Date: 2020-05-22
沈阳金纳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving intermetallic compounds in cast alloys, which solves the problem of brittle fracture of materials caused by the existence of intermetallic compounds

Method used

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  • Method for improving intermetallic compounds in casting alloys
  • Method for improving intermetallic compounds in casting alloys
  • Method for improving intermetallic compounds in casting alloys

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Effect test

Embodiment 1

[0069] The GH4169 alloy has a large tolerance of material expansion and contraction recovery run-out, so that the material is used under high temperature and harsh conditions. Before the fatigue life of the material expires, the tolerance of the material cycle deformation recovery fluctuation becomes larger and larger until it exceeds the limit value and is scrapped. It has become a hot spot in the industry to solve the microstructure stability of the intermediate metal compound of the material and then reduce the expansion and contraction rebound value during the use of the material. Under this process, the expansion and contraction recovery run-out tolerance of the material has been significantly changed.

[0070] Table 1 Main chemical composition of GH4169 alloy

[0071] C Cr Ni co Mo ≤0.08 17.0-21.0 50-55.0 0.02-1.0 2.80-3.30 Al Ti Nb Si Fe 0.30-0.70 0.75-1.15 4.85-5.40 ≤0.2 Remain

[0072] The main intermetallic compounds ...

Embodiment 2

[0119] The yield of iron-based alloy M42 is only 45% due to material brittleness in the process of rolling thin plates (thickness below 1.5mm), and the service life of thin plate materials is not optimistic. Through the process of the invention, the finished product rate of the alloy M42 thin plate is increased to 80%, and the service life is increased to 3 times of the original one. This is because the present invention changes the material macro effect brought about by the microstructure of the alloy intermetallic compound.

[0120] Table 4 Main chemical composition of iron-based alloy M42

[0121]

[0122]

[0123] The main intermetallic compounds in the iron-based alloy M42 are shown in Table 5.

[0124] Table 5 Melting points of compounds in M42 alloy (°C)

[0125] Simple substance melting point compound melting point compound melting point V 1919 VC 2830 TiC 3160 Mo 2617 Mo 2 C

2690 W 2 C

2730 C 3727 MoC ...

Embodiment 3

[0170] The high-end copper-based alloy ZrCrCu needs to meet both mechanical properties and electrical conductivity, but the mechanical properties and electrical conductivity are contradictory, and improving one of them will weaken the other. The material of the invention is simultaneously improved in terms of mechanical properties and electrical conductivity.

[0171] Table 7 Main chemical composition of copper-based alloy ZrCrCu

[0172] C Cr Zr Fe max0.05 0.8-1.1 0.13-0.2 max0.03 Cu Mg Si mn margin 0.0005-0.008 max0.01 max0.01

[0173] The specific smelting method is as follows:

[0174] Step 1. Copper-based alloy ZrCrCu alloy liquid initialization

[0175] (1) First put the cast alloy raw materials copper, copper chromium and copper zirconium into a quartz crucible, and put the quartz crucible into a vacuum induction melting furnace with magnetic stirring function, then vacuumize, and when the vacuum degree reaches below 9Pa ...

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Abstract

The invention relates to a method for improving intermetallic compounds in casting alloys. The method is successfully applied to nickel-based alloys, iron-based alloys and copper-based alloys. The method comprises the following steps that (1) casting alloy raw materials are putted into a crucible, the crucible is putted into a vacuum induction melting furnace, and the casting alloy raw materials are subjected to induction heating to a temperature above a liquidus line; (2) a liquid metal alloy melting liquid is subjected to a refining process in accordance with a prescribed heat treatment curve; (3) a melt is heated to the casting temperature; (4) the melt is poured into a preheated mold shell along a sprue cup under the heating condition of power supply; and (5) a water-cooled copper discat the lower part of the mold shell is started, so that the temperature of the melt in the mold shell is reduced and solidified, and a casting is obtained. The method can improve the number and morphology of the intermetallic compounds in the casting alloys and even the short-range arrangement in the radicals to a greater extent, so that the distribution of the intermetallic compounds is more uniform and refined, and therefore the comprehensive mechanical property of the casting alloys is improved. The refining process of the method is suitable for industrial production.

Description

technical field [0001] The present invention designs a method for improving intermetallic compounds in cast alloys, especially a method for improving intermetallic compounds in nickel-based alloys, iron-based alloys and copper-based alloys by using a melt high-temperature heat treatment refining process, which belongs to metal materials Foundry field. Background technique [0002] With the rapid development of science and technology in our country, various new metal materials have emerged as the times require. In order to improve the performance of metal materials, a variety of alloying elements are generally added to alloy materials. The interaction between alloying elements can generally form a variety of phases, including intermetallic compounds. Intermetallic compounds have outstanding advantages such as light specific gravity, high temperature resistance, oxidation resistance, high melting point, high specific strength, good high temperature creep performance and excel...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C19/05B22D27/04
CPCB22D27/04C22C1/023C22C19/055C22C19/056
Inventor 李洪锡
Owner 沈阳金纳新材料股份有限公司
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