Study on Heat Treatment of Medium Carbon Cr-Mn-Si Low Alloy Wear-resistant Cast Steel
Heat Treatment Process
Low alloy wear-resistant cast steel is typically a martensitic steel with a carbon content that ranges from 0.1 to 0.5%, and a chromium content from 4 to 8%. The cast steel is heated until it reaches its austenitizing temperature. Once the austenitizing temperature is reached, the steel transitions from its ferrite phase to an austenitic phase. The steel is then quenched in an oil bath to rapidly cool it and create its martensitic structure. After quenching, the steel is tempered to reduce its hardness and brittleness whilst also improving its strength and ductility. The tempering temperature for low alloy wear-resistant cast steel should be between 150 to 650°C. After tempering, the steel is cooled to ambient temperatures in order to create its final hardened state.
Process of Heat Treatment of Wear-resistant Cast Steel
The process of heat treatment of wear-resistant cast steel typically involves the following steps:
1. Heating the steel to its austenitizing temperature
2. Quenching in an oil bath
3. Tempering at a temperature range of 150 to 650°C
4. Cooling to ambient temperatures to create the final hardened state
Drawing 2: Steel
Benefits of Heat Treatment
In addition to improving the macroscopic properties of the steel, heat treatment of the low alloy wear-resistant cast steel also offers many other benefits. Heat treatment can increase the wear resistance and corrosion resistance of the steel. This is accomplished by adjusting its carbide content through the process of carbide precipitation. Heat treatment also improves the dimensional stability of the material by relieving the stresses associated with manufacturing processes and providing additional strength to the steel. Finally, heat treatment can both reduce the danger of fracture by toughening the steel, and improve the hardenability of the steel.
This article outlines the process of heat treatment for low alloy wear-resistant cast steel. Heat treatment of this material improves the macroscopic properties of the steel, as well as increasing its wear resistance and corrosion resistance. Heat treatment can also increase the dimensional stability and hardenability of the steel, as well as reduce the danger of fracture.
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