 Decarbonization When steel is heated, surface carbon reacts with oxygen, hydrogen, carbon dioxide and water vapor in atmosphere, which reduces surface carbon concentration. It is called decarbonization. After quenching, surface hardness, fatigue strength and wear resistance of decarbonized steel decrease, and the surface cracks is easy to form due to surface residual tensile stress. |
When heated, iron and alloys on the surface of steel react with oxygen, carbon dioxide and water vapor in atmosphere to form oxide film, which is called oxidation. The dimension accuracy and surface brightness of high temperature (generally over 570 degrees) parts deteriorated after oxidation. The steel parts with poor hardenability will have hardening soft points. |
In order to prevent oxidation and reduce decarbonization, methods are as follows: parts surface coating; sealed heating with stainless steel foil; heating with salt bath furnace; heating with protective atmosphere (such as purified inert gas), flame combustion furnace (making furnace gas reductive).
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