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Preparation method of exhaust valve head material containing Ce

An exhaust valve and head technology, which is applied in the field of Ce-containing exhaust valve head material and its preparation, can solve the problems of inability to meet the requirements of engine use, easy changes in structure, low high temperature strength, etc., and achieves improved high temperature strength. , high life, excellent comprehensive performance

Inactive Publication Date: 2018-06-29
安徽鼎立智能制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Must have good wear resistance and service life
[0004] At present, the head material of the exhaust valve is mainly 21-4N, the type of material is very single, the high temperature strength is not high, and the structure is easy to change at a high temperature exceeding 800 degrees, which cannot meet the requirements of some engines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The specific steps of preparing the Ce-containing exhaust valve head material through low-pressure casting, rolling, and heat treatment are as follows:

[0018] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.32%; Si: 0.25%; Mo: 2.0%; Mn: 6.50%; Cr: 15%; W: 0.50%; Ni : 2.0%; Ce: 1.0%; the remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0019] (2) Melting in a vacuum induction furnace at a temperature of 1620°C for 1.5 hours;

[0020] (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%;

[0021] (4) heating to 1050 ℃ for 1 hour, quenching;

[0022] (5) Heating to 800° C. for 4 hours and quenching to obtain th...

Embodiment 2

[0024] The specific steps of preparing the Ce-containing exhaust valve head material through low-pressure casting, rolling, and heat treatment are as follows:

[0025] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.32%; Si: 0.25%; Mo: 2.0%; Mn: 6.50%; Cr: 15%; W: 0.50%; Ni : 2.0%; Ce: 1.0%; the remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0026] (2) Melting in a vacuum induction furnace at a temperature of 1680°C for 1.5 hours;

[0027] (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%;

[0028] (4) Heating to 1150°C for 0.5 hours, then quenching;

[0029] (5) Heating to 820° C. for 3 hours and quenching to o...

Embodiment 3

[0031] The specific steps of preparing the Ce-containing exhaust valve head material through low-pressure casting, rolling, and heat treatment are as follows:

[0032] (1) Ingredients, the alloy weight percentage composition of the exhaust valve head material is: C: 0.34%; Si: 0.27%; Mo: 1.0%; Mn: 6.60%; Cr: 17.00%; W: 0.80%; Ni : 1.7%; Ce: 0.75%; the remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0033] (2) Melting in a vacuum induction furnace at a temperature of 1620°C for 1.5 hours;

[0034] (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%;

[0035] (4) Heating to 1100°C for 0.5 hours, then quenching;

[0036] (5) Heating to 800° C. for 3 hours and quenching ...

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Abstract

The invention discloses an exhaust valve head material containing the Ce and a preparation method thereof. The alloy comprises alloy components in percentage, by weight, 0.32-0.40% of C; 0.17-0.37% ofSi; 1.0-2.0% of Mo, 6.5-8.0% of Mn; 15-18 % of Cr, 0.50-1.0% of W; 1.5-2.5% of Ni; 0.50-1.0% of Ce; less than or equal to 0.015 of P; less than or equal to 0.015 of S; less than or equal to 0.010% ofCu; and the balance of Fe; and the valve material is formed by low-pressure casting, rolling and heat treatment. According to the reparation method of the exhaust valve head material containing the Ce, the valve head material has the advantages of excellent heat resistance and good heat stability, and is especially high in high-temperature strength and long in service life.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a Ce-containing 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, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/44C22C38/58C22C33/04C21D1/18
CPCC22C38/02C21D1/18C22C33/04C22C38/005C22C38/44C22C38/58
Inventor 方纯结
Owner 安徽鼎立智能制造股份有限公司
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