Preparation method of air valve alloy equiaxed grains

A technology of equiaxed grains and alloys, which is applied in the field of preparation and display of axial grains, and achieves the effect of solving the problem of not easy corrosion and convenient structure inspection.

Inactive Publication Date: 2021-01-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the addition of chromium also increases the metallographic structure of the alloy and the corrosion difficulty of the grains, a uniquely prepared corrosion solution is usually required for valve alloys.

Method used

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  • Preparation method of air valve alloy equiaxed grains
  • Preparation method of air valve alloy equiaxed grains
  • Preparation method of air valve alloy equiaxed grains

Examples

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with a typical embodiment.

[0022]In this embodiment, a 50 kg vacuum induction furnace was used for smelting, and 7 furnaces were smelted successively. The specific composition of the 7 furnaces of the gas valve alloy smelted is shown in Table 1. The alloy steel ingot is billeted and forged to form a Φ90mm bar. The sample is cut from the Φ90mm bar and ground to form a Φ8mm×Φ15mm cylindrical sample. Compression test. The specific process is: raise the temperature to the heating temperature at a rate of 10°C / s, keep it warm for 5 minutes, and then perform thermal compression at a specified deformation rate. After reaching the specified deformation, stop the compression and quickly water-cool the sample. The compression temperature is 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, and the compression strain rate is 0.01S -1 , 0.1S -1 , 1S -1 、5S -1 , the amount of deformation is 10%, 20%, 30%...

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Abstract

The invention discloses a preparation method of air valve alloy equiaxed grains, and belongs to the technical field of air valve alloy manufacturing and metal material microstructure characterization.The air valve alloy equiaxed grains are prepared from the chemical components including, by weight, 0.05%-0.18% of C, 0.10%-0.50% of Si, 0.50%-1.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 22.00%-27.00% of Cr, 24.00%-27.00% of Ni, 0.90%-2.20% of Al, 2.00%-3.00% of Ti, 0.50%-1.50% of Nb, 0.20%-0.50% of V, 0.020%-0.080% of Zr and 0.030%-0.080% of Ce. The air valve alloy is subjected to hot compression, when the hot compression temperature ranges from 1,050 DEG C to 1,200 DEG C, the strain rate ranges from 0.1 S-1 to 1S-1, the deformation ranges from 30% to 60%, and the equiaxed completely-recrystallized grains are obtained. The method has the advantages that the problem that a high-chromium air valve alloy is not prone to corrosion is well solved, and material structure inspection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of gas valve alloy manufacturing and metal material microstructure characterization, and in particular relates to a preparation and display method of gas valve alloy equiaxed grains, which is applicable to transportation, metallurgy, machinery, energy, aviation, aerospace, chemical industry, etc. field. Background technique [0002] Valve material is also called valve material, which mainly refers to the material used to manufacture the intake and exhaust valves of internal combustion engines. Such materials are required to have good high-temperature strength, high-temperature hardness, creep resistance and flue gas corrosion resistance because they work in high-temperature and corrosive atmosphere working environments. The valve alloy is one of the valve materials, and the valve material includes valve steel and valve alloy. Valve steel includes martensitic valve steel and austenitic valve steel, common g...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/50C22C38/48C22C38/46C21D6/00C21D8/00C23F1/28G01N1/32
CPCC21D6/004C21D6/005C21D6/008C21D8/005C22C38/005C22C38/02C22C38/04C22C38/06C22C38/46C22C38/48C22C38/50C23F1/28G01N1/32
Inventor王立民李权赵吉庆程杰锋陈正宗何西扣包汉生唐广波杨钢刘正东
OwnerCENT IRON & STEEL RES INST