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A kind of exhaust valve head material and preparation method thereof

A technology of exhaust valve and head, which is applied in the field of exhaust valve head materials and its preparation, can solve the problems of not being able to meet the requirements of engines in different working conditions, reduce life fatigue failure, and poor high temperature stability, and achieve improved The effects of compactness and purity, high fatigue strength, and stable organization

Inactive Publication Date: 2015-10-28
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the head material of the exhaust valve is mainly 21-4N, and the type of material is very single, which cannot meet the requirements of engines in different working conditions.
In addition, the material has problems such as poor high-temperature stability, reduced service life due to fatigue failure due to layered carbides, short service life, and low yield due to surface cracks in the billet.

Method used

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  • A kind of exhaust valve head material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The exhaust valve head material is prepared by low-pressure casting, rolling, and heat treatment. The specific steps are as follows:

[0017] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.32%; Si: 0.17%; Mo: 3.0%; Mn: 6.50%; Cr: 22%; W: 0.50%; Ni : 3.0%; Surplus material is the Fe that purity is 99.8%, alloy material is mixed evenly;

[0018] (2) Melting in a vacuum induction furnace at a temperature of 1620°C for 1.5 hours;

[0019] (3) Low-pressure casting is adopted, and the process conditions of low-pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressurization 0.01MPa, pressure holding time 10s, rolling 3 times, and the casting is rolled again Forming, rolling three times, the deformation of the last rolling is 45%;

[0020] (4) Heating to 1050°C for 1 hour, then quenching;

[0021] (5) Heating to 800°C for 4 hours and quenching to obtain the exhaust valve head material. The hi...

Embodiment 2

[0023] The exhaust valve head material is prepared by low-pressure casting, rolling, and heat treatment. The specific steps are as follows:

[0024] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.40%; Si: 0.25%; Mo: 3.0%; Mn: 6.80%; Cr: 21.1%; W: 1.0%; Ni : 3.2%; Surplus material is the Fe that purity is 99.8%, alloy material is mixed evenly;

[0025] (2) Melting in a vacuum induction furnace at a temperature of 1680°C for 1.5 hours;

[0026] (3) Low-pressure casting is adopted, and the process conditions of low-pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressurization 0.01MPa, pressure holding time 10s, rolling 3 times, and the casting is rolled again Forming, rolling three times, the deformation of the last rolling is 45%;

[0027] (4) Heating to 1150°C for 0.5 hours, then quenching;

[0028] (5) Heating to 820°C for 3 hours and quenching to obtain the exhaust valve head material. Th...

Embodiment 3

[0030] The exhaust valve head material is prepared by low-pressure casting, rolling, and heat treatment. The specific steps are as follows:

[0031] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.34%; Si: 0.37%; Mo: 2.75%; Mn: 6.60%; Cr: 20.00%; W: 0.80%; Ni : 2.9%; the remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0032] (2) Melting in a vacuum induction furnace at a temperature of 1650°C for 1.5 hours;

[0033] (3) Low-pressure casting is adopted, and the process conditions of low-pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressurization 0.01MPa, pressure holding time 10s, rolling 3 times, and the casting is rolled again Forming, rolling three times, the deformation of the last rolling is 55%;

[0034] (4) Heating to 1100°C for 0.5 hours, then quenching;

[0035] (5) Heating to 800°C for 3 hours and quenching to obtain the exhaust valve hea...

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Abstract

The invention discloses an exhaust valve head material and a preparation method thereof. The exhaust valve head material comprises the following alloying components in percentage by weight: 0.32-0.40% of C, 0.17-0.37% of Si, 2.0-3.0% of Mo, 6.5-8.0% of Mn, 20-22% of Cr, 0.50-1.0% of W, 2.5-3.5% of Ni, at most 0.015 of P, at most 0.015 of S, at most 0.010% of Cu and the balance of Fe. The valve material is prepared by low-pressure casting, rolling and heat treatment. The exhaust valve head material has the advantages of high heat resistance, high heat stability, high high-temperature fatigue strength and long service life.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an exhaust valve head material and a preparation method thereof. Background technique [0002] The valve is one of the key parts of the engine, and it is a direct part used to open or close the intake and exhaust passages. The valve is the seal that seals the combustion chamber and controls the gas exchange of the engine during the working process of the engine. It is an important part to ensure the power, economy and reliability of the engine. The valves are divided into intake valves and exhaust valves. The air enters the engine cylinder through the intake valve and is mixed with fuel for combustion. The exhaust gas generated after combustion is discharged from the cylinder through the exhaust valve, so that fresh air enters the cylinder and burns to generate the driving force of the vehicle. Get rid of exhaust gas. The working conditions of the valve are harsh, and the working...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/04B22D18/04C21D8/00C21D9/00
Inventor 杨卫国
Owner JIANGSU UNIV OF SCI & TECH
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