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Superficial layer carburization process for automobile hub

A kind of technology of automobile wheel hub and shallow layer, which is applied in the direction of metal material coating process, coating, manufacturing tools, etc., can solve the problems of high austenite content, affecting mechanical properties, surface hardness difficult to meet technical requirements, etc., and achieve residual austenite The effect of reducing the content of tensite and non-martensite, improving hardness and wear resistance

Active Publication Date: 2016-08-24
HANSHAN ZHAOXIA CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing carburizing and quenching process usually uses carburizing and precooling, followed by direct quenching, but the amount of residual austenite in the carburized layer after quenching is relatively high, especially for essentially coarse-grained steel, the surface is easy to form network carbides, and the surface hardness is difficult to achieve Technical requirements, affecting its mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of car wheel hub shallow carburizing process, comprises the steps:

[0028] S1. Impurity removal: clean the residual oil stains, dirt and burrs on the surface of the hub;

[0029] S2. Ventilation: Put the hub into the carburizing furnace, exhaust the air in the furnace, evacuate the furnace until the pressure in the furnace is -0.35MPa, fill in nitrogen protective gas, and raise the temperature in the carburizing furnace at a rate of 120°C / h to 450°C, and then raise the temperature in the carburizing furnace to 860°C at a rate of 450°C / h;

[0030] S3, strong infiltration: 40m respectively 3 / h and 70m 3 Fill the furnace with methanol cracking gas and propane at a speed of / h; keep the carbon potential in the furnace at 1.1, and keep the temperature constant for 3.5 hours;

[0031] S4. Diffusion and cooling: adjust the furnace temperature to 845°C, adjust the carbon potential in the furnace to 0.95, and keep the temperature constant for 5h; cool to 820°C, then ...

Embodiment 2

[0035] A kind of car wheel hub shallow carburizing process, comprises the steps:

[0036] S1. Impurity removal: clean the residual oil stains, dirt and burrs on the surface of the hub;

[0037] S2. Ventilation: Put the wheel hub into the carburizing furnace, exhaust the air in the furnace, evacuate the furnace until the pressure in the furnace is -0.25MPa, fill in nitrogen protective gas, and put the carburizing furnace at a speed of 100-150°C / h The temperature is raised to 450°C, and then the temperature in the carburizing furnace is raised to 870°C at a speed of 420°C / h;

[0038] S3, strong infiltration: 50m respectively 3 / h and 70m 3 Fill the furnace with methanol cracking gas and propane at a speed of 1 / h; keep the carbon potential in the furnace at 0.9, and keep the temperature constant for 4 hours;

[0039] S4. Diffusion and cooling: adjust the furnace temperature to 840°C, adjust the carbon potential in the furnace to 0.8, and keep the temperature constant for 6 hou...

Embodiment 3

[0043] A kind of car wheel hub shallow carburizing process, comprises the steps:

[0044] S1. Impurity removal: clean the residual oil stains, dirt and burrs on the surface of the hub;

[0045] S2. Ventilation: Put the hub into the carburizing furnace, exhaust the air in the furnace, evacuate until the pressure in the furnace is -0.5MPa, fill in nitrogen protective gas, and raise the temperature in the carburizing furnace at a rate of 150°C / h to 450°C, and then raise the temperature in the carburizing furnace to 870°C at a rate of 400°C / h;

[0046] S3, strong infiltration: respectively with 35m 3 / h and 60-80m 3 Fill the furnace with methanol cracking gas and propane at a speed of 1.2 h; keep the carbon potential in the furnace at 1.2, and keep the temperature constant for 3.5 h;

[0047] S4. Diffusion and cooling: adjust the furnace temperature to 845°C, adjust the carbon potential in the furnace to 0.85, and keep the temperature constant for 4 hours; cool to 830°C, then a...

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Abstract

The invention relates to the technical field of hub production, in particular to a superficial layer carburization process for an automobile hub. The process comprises the following steps of impurity removal, ventilation, great permeation, diffusion, cooling, quenching and tempering. The thickness of the carburization layer of the hub obtained through the hub superficial layer carburization process is 2.5-3 mm, and the content of retained austenite and non-martensite of the outer superficial layer is effectively lowered; in addition, a great number of fine carbide particles which are distributed in a scattered mode are formed on the outer superficial permeation layer, and hardness and wear resistance of a hub steel piece are effectively improved.

Description

technical field [0001] The invention relates to the technical field of wheel production, in particular to a shallow carburizing process for automobile wheels. Background technique [0002] Most of the existing automobile wheels have low carbon content, and the material structure is composed of ferrite and pearlite. After quenching, it is mostly lath martensite; low-carbon steel has high toughness, low hardness, and poor wear resistance. For cars traveling at high speeds, it is not uncommon for tire blowouts and reduced braking performance to occur due to high temperatures generated by wheel hub deformation and braking. Due to the particularity of the working environment of the hub, many hubs are required not only to withstand impact loads, but also to wear resistance, so the hub needs to be carburized. Carburizing is a method of treating the metal surface, so that the activated carbon atoms decomposed in the carburizing medium penetrate into the surface layer of the steel p...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D9/34
CPCC21D1/18C21D9/34C23C8/22
Inventor 黄远霞
Owner HANSHAN ZHAOXIA CASTING
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