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A quenching and tempering vermicular graphite cast iron, vermicular graphite cast iron quenching and tempering method and application thereof

A technology of vermicular graphite cast iron, quenched and tempered, applied in furnaces, heat treatment equipment, manufacturing tools, etc., to achieve the effects of reducing residual stress, preventing expansion, and avoiding cracking

Active Publication Date: 2022-02-18
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Quenching and tempering treatment refers to the heat treatment process of high-temperature tempering of steel after quenching. The purpose is to improve the plasticity and toughness of steel, match the plasticity and toughness, and obtain the best comprehensive mechanical properties. It can also be used for ductile iron. Parts, but no reports have been used to improve the mechanical properties of compacted graphite iron

Method used

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  • A quenching and tempering vermicular graphite cast iron, vermicular graphite cast iron quenching and tempering method and application thereof
  • A quenching and tempering vermicular graphite cast iron, vermicular graphite cast iron quenching and tempering method and application thereof
  • A quenching and tempering vermicular graphite cast iron, vermicular graphite cast iron quenching and tempering method and application thereof

Examples

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Embodiment 1

[0044] This embodiment provides a RuT350 cylinder head rough quenching and tempering method, comprising the following steps:

[0045] (1) Austenitization treatment: Put the cylinder head blank cast from RuT350 into a quenching furnace and heat it to 870°C, keep it warm for 1.5h, and the cylinder head blank will be completely austenitized.

[0046](2) Quenching treatment: After the cylinder head blank comes out of the furnace, it is quickly transferred to the quenching oil tank for quenching treatment. The oil temperature is controlled at 80°C. Oil.

[0047] (3) High-temperature tempering treatment: put the quenched cylinder head blank into a tempering furnace heated to 650°C, keep it warm for 3 hours, then take it out, and air-cool it to room temperature.

[0048] (4) Machining: Process the cylinder head blank processed in step (3) into a finished cylinder head according to the size requirements of the finished product drawing, that is, quenched and tempered RuT350 cylinder h...

Embodiment 2

[0051] This embodiment provides a RuT350 cylinder head rough quenching and tempering method, comprising the following steps:

[0052] (1) Austenitization treatment: Put the cylinder head blank cast from RuT350 into a quenching furnace and heat it to 910°C, keep it warm for 1.5h, and the cylinder head blank will be completely austenitized.

[0053] (2) Quenching treatment: After the cylinder head blank comes out of the furnace, it is quickly transferred to the quenching oil tank for quenching treatment. The oil temperature is controlled at 80°C. Oil.

[0054] (3) High-temperature tempering treatment: put the quenched cylinder head blank into a tempering furnace heated to 650°C, keep it warm for 3 hours, then take it out, and air-cool it to room temperature.

[0055] (4) Machining: Process the cylinder head blank processed in step (3) into a finished cylinder head according to the size requirements of the finished product drawing, that is, quenched and tempered RuT350 cylinder ...

Embodiment 3

[0058] This embodiment provides a RuT350 cylinder head rough quenching and tempering method, comprising the following steps:

[0059] (1) Austenitization treatment: Put the cylinder head blank cast from RuT350 into a quenching furnace and heat it to 930°C, keep it warm for 1.5h, and the cylinder head blank will be completely austenitized.

[0060] (2) Quenching treatment: After the cylinder head blank comes out of the furnace, it is quickly transferred to the quenching oil tank for quenching treatment. The oil temperature is controlled at 80°C. Oil.

[0061] (3) High-temperature tempering treatment: put the quenched cylinder head blank into a tempering furnace heated to 650°C, keep it warm for 2 hours, then take it out, and air-cool it to room temperature.

[0062] (4) Machining: Process the cylinder head blank processed in step (3) into a finished cylinder head according to the size requirements of the finished product drawing, that is, quenched and tempered RuT350 cylinder ...

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Abstract

The invention relates to a quenched and tempered vermicular graphite cast iron, a quenched and tempered vermicular graphite cast iron method and an application thereof. The method comprises the following steps: (1) austenitizing treatment: place the compacted graphite cast iron blank in a quenching furnace at 870-930°C, and keep warm until the matrix structure is completely austenitized; (2) quenching treatment: compacted graphite cast iron After the blank is out of the furnace, it is quickly immersed in quenching oil maintained at 70-85°C, the cooling rate is ≤85°C / s, cooled to below the martensitic transformation temperature point, taken out and air-cooled to room temperature; (3) High temperature tempering treatment: the vermicular ink The cast iron blank is placed in a tempering furnace at 550-650° C., kept for 1-4 hours, and finally the compacted graphite cast iron blank is air-cooled to room temperature to obtain quenched and tempered vermicular graphite cast iron. The invention develops a quenching and tempering process suitable for vermicular graphite cast iron, which avoids quenching and cracking. The metallographic structure of quenched and tempered vermicular graphite cast iron is mainly fine sorbite structure, which can effectively prevent the expansion of thermal fatigue cracks, and the residual stress is the smallest. It is beneficial to prolong the service life of vermicular graphite cast iron parts.

Description

technical field [0001] The invention relates to the field of auto parts manufacturing, in particular to a quenched and tempered vermicular graphite cast iron, a quenched and tempered vermicular graphite cast iron method and an application thereof. Background technique [0002] The graphite form of vermicular graphite cast iron is between spherical graphite and flake graphite, and it is obtained by treating molten iron with high carbon equivalent with rare earth alloy, rare earth calcium alloy, or simultaneously using spheroidizing element magnesium and anti-spheroidizing element Al, Ti, etc. , the chemical composition usually contains C 2.5-4.0%, Si 1.0-3.0%, Mn 0.2-1.0%, P 0.01-0.1%, S 0.01-0.03%, RE0.04-0.06%, hardness HB150-250, tensile The strength is 350-500MPa, and the thermal conductivity is 3-50W / mK. Compared with gray iron, compacted graphite iron has slightly lower thermal conductivity, but its strength is much higher; compared with high-strength ductile iron, com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/25C21D5/00C21D9/00F02F1/24
CPCC21D1/25C21D5/00C21D9/0068F02F1/24C21D2211/009C21D2211/005C21D2211/006
Inventor 樊晓光赵俊平吴永强牛恩来鲁福来余金科谭卫军田朕
Owner DONGFENG COMML VEHICLE CO LTD