A method of improving intermetallic compounds in cast alloys

A technology for 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, and achieve the effects of reducing scrap rate, quantity, and formation time.

Active Publication Date: 2021-10-01
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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  • A method of improving intermetallic compounds in cast alloys
  • A method of improving intermetallic compounds in cast alloys
  • A method of improving intermetallic compounds in cast alloys

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Experimental program
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Embodiment 1

[0069] The GH4169 alloy has a large tolerance of material expansion and contraction recovery run-out, so that the material is scrapped when it exceeds the limit value before the fatigue life of the material expires due to the large tolerance of the material cycle deformation recovery fluctuation. 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 in GH4169 alloy are shown in Table 2.

[0073] The melting point (°C) o...

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 point 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 2...

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 cast alloys, and is successfully applied to nickel-based alloys, iron-based alloys, and copper-based alloys. The steps are: (1) put the cast alloy raw materials into a crucible, and place the Put it into a vacuum induction melting furnace, and heat the casting alloy raw material to a temperature above the liquidus line by induction. (2) Refining the liquid metal alloy melt according to the specified heat treatment curve. (3) heat up the melt to the pouring temperature; (4) pour the melt into the preheated mold shell along the sprue cup under the heating of the power supply; (5) start the water-cooled copper plate at the lower part of the mold shell, The temperature of the melt in the mold shell is lowered and solidified to obtain a casting. The method can greatly improve the quantity, shape and short-range arrangement of the intermetallic compounds in the casting alloy, so that the distribution of the intermetallic compounds is more uniform and refined, thereby improving the comprehensive mechanical properties of the casting alloy. The refining process of the present invention is suitable for industrialized 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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Patent Type & Authority Patents(China)
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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