Effect of silicon content and heat treatment process on mechanical properties of low alloy wear-resistant steel
Silicon is an important alloying element of low alloy wear-resistant steel due to its effect on hardenability and tempering resistance. The addition of silicon can increase the strength and hardness of steel, while reducing its ductility and toughness. Generally, the higher the silicon content, the higher the strength and hardness, but the lower the ductility of the steel. Experiments have shown that a silicon content of 6-8% is ideal for wear-resistant steel as it provides sufficient hardness and strength without compromising its ductility and toughness.
Heat treatment process is another important factor that can affect the properties of low alloy wear-resistant steels. Generally, these steels are heat treated by quenching and tempering to improve their corrosion, wear, and fatigue resistances. Quenching is a process in which the steel is rapidly cooled to form martensite, and tempering is used to relieve the stress of the steel caused by quenching. The tempering temperature affects both the strength and toughness of the steel, while the quenching temperature affects the hardness of the steel. Based on experiments, a quenching temperature of 900-950℃, and a tempering temperature of 460-520℃ are found to be an optimal combination to achieve the desired properties in low alloy wear-resistant steel.
In summary, the silicon content and heat treatment processes can significantly affect the mechanical properties of low alloy wear-resistant steel. A silicon content of 6-8%, and quenching and tempering at optimal temperature are recommended to achieve the desired results.
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