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Exhaust valve head material with excellent high temperature strength performance and preparation method thereof

A high-temperature strength and exhaust valve technology, applied in the field of metal materials, can solve the problems of low high-temperature strength of the valve, shortened valve life, and low high-temperature strength, so as to improve compactness and purity, improve high-temperature cycle life, and comprehensive performance excellent effect

Active Publication Date: 2015-10-28
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Overloading and overspeeding of the engine is a very common phenomenon. Due to the overload operation, the temperature inside the engine will generally be aggravated and the actual working temperature of the valve will be too high, resulting in changes in the structure and strength of the valve material.
The high-temperature strength of the valve is not high, which is the main factor for the premature damage of the valve and the shortened service life
[0004] 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 low high-temperature strength, reduced service life due to fatigue failure due to layered carbides, short service life, and low yield due to surface cracks in the blank.

Method used

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  • Exhaust valve head material with excellent high temperature strength performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The exhaust valve head material with excellent high temperature strength performance is prepared by low pressure casting, rolling and heat treatment. The specific steps are as follows:

[0018] (1) Ingredients, the alloy weight percentage composition is: C: 0.32%; Si: 0.17%; Mo: 2.0%; Mn: 6.50%; Cr: 22%; W: 0.50%; Ni: 2.0%; Nb: 1.0% ; The remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0019] (2) Smelting in vacuum induction furnace, temperature 1620℃, smelting for 1.5 hours;

[0020] (3) Using low pressure casting, the process conditions of low pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressure 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, then quenching;

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

Embodiment 2

[0024] The exhaust valve head material with excellent high temperature strength performance is prepared by low pressure casting, rolling and heat treatment. The specific steps are as follows:

[0025] (1) Ingredients, the alloy weight percentage composition is: C: 0.40%; Si: 0.25%; Mo: 2.0%; Mn: 6.80%; Cr: 21.1%; W: 1.0%; Ni: 2.2%; Nb: 0.50% ; The remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0026] (2) Smelting in vacuum induction furnace, temperature 1680℃, smelting for 1.5 hours;

[0027] (3) Using low pressure casting, the process conditions of low pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressure 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℃ for 0.5 hours, then quenching;

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

Embodiment 3

[0031] The exhaust valve head material with excellent high temperature strength performance is prepared by low pressure casting, rolling and heat treatment. The specific steps are as follows:

[0032] (1) Ingredients, the alloy weight percentage composition is: C: 0.34%; Si: 0.37%; Mo: 1.75%; Mn: 6.60%; Cr: 20.00%; W: 0.80%; Ni: 1.7%; Nb: 0.75% ; The remaining material is Fe with a purity of 99.8%, and the alloy material is mixed evenly;

[0033] (2) Smelting in vacuum induction furnace, temperature 1650℃, smelting for 1.5 hours;

[0034] (3) Using low pressure casting, the process conditions of low pressure casting are: filling pressure 0.06MPa, filling speed 50mm / s, filling pressure 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℃ for 0.5 hours, then quenching;

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

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Abstract

The invention discloses an exhaust valve head material having excellent high-temperature strength and a preparation method thereof. Alloy components of the exhaust valve head material having excellent high-temperature strength comprise 0.32-0.40wt% of C, 0.17-0.37wt% of Si, 1.0-2.0wt% of Mo, 6.5-8.0wt% of Mn, 20-22wt% of Cr, 0.50-1.0wt% of W, 1.5-2.5wt% of Ni, 0.50-1.0wt% of Nb, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.010wt% of Cu and the balance Fe. The exhaust valve head material is prepared by low-pressure casting, rolling and heat treatment. The exhaust valve head material has the advantages of good heat resistance, good heat stability, high high-temperature strength and long service life.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to an exhaust valve head material with excellent high temperature strength performance and a preparation method thereof. Background technique [0002] The valve is one of the key parts of the engine, it is the direct part used to open or close the intake and exhaust passages. The valve is a 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 component to ensure the power, economy and reliability of the engine. The valve is divided into an intake valve and an exhaust valve. 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. Exhaust exhaust. The w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/04
Inventor 杨卫国
Owner HUAWEI TEHCHNOLOGIES CO LTD
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