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Effect of Alloying Elements on the Technological Properties of Medium and Heavy Plate

2023-01-05 17:53:24
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1. Effect of alloy elements on the casting properties of medium and heavy plates

The lower the temperature of solidus and liquidus and the narrower the crystallization temperature zone, the better the casting performance. The influence of alloying elements on the casting properties mainly depends on their influence on the Fe-Fe3C phase diagram. In addition, many elements, such as Cr, Mo, V, Ti, Al, etc., form high melting point carbides or oxidation material points in medium and heavy plates, which increase the viscosity of medium and heavy plates, reduce the fluidity, and worsen the casting properties.

2. Effect of alloy elements on plastic workability of medium and thick plates

Plastic processing is divided into hot processing and cold processing. Alloy elements dissolved in the solid solution or formed carbides (such as Cr, Mo, W, etc.) will increase the hot deformation resistance and significantly reduce the thermoplasticity of medium and heavy plates, which will lead to forging cracks. In general, the hot working performance of alloy plate is much worse than that of carbon plate.

3. Effect of alloy elements on welding performance of medium and thick plates

Alloy elements all improve the hardenability of medium and heavy plates, promote the formation of brittle structure (martensite), and make the welding performance worse. However, the medium thick plate contains a small amount of Ti and V, which can improve the welding performance of the plate.

4. The influence of alloy elements on the cutting performance of medium and thick plates The cutting performance is closely related to the hardness of medium and thick plates. The hardness range of medium and thick plates suitable for machining is 170HB~230HB. The machinability of general alloy plate is worse than that of carbon plate. However, proper addition of S, P, Pb and other elements can greatly improve the cutting performance of plate.

5. Effect of alloy elements on heat treatment process properties of medium and heavy plates

The heat treatment process performance reflects the difficulty of heat treatment of medium and heavy plates and the tendency to produce defects during heat treatment. It mainly includes hardenability, overheating sensitivity, temper embrittlement tendency and oxidation decarburization tendency. Due to the high hardenability of alloy plate, a relatively slow cooling method can be used during quenching to reduce the deformation and cracking tendency of the workpiece. The addition of manganese and silicon will increase the superheat sensitivity of plate.

The medium thick plates used to manufacture important engineering structures and machine parts are called alloy structure medium thick plates. It mainly includes low alloy structure plate, alloy carburized plate, alloy quenched and tempered plate, alloy spring plate and ball bearing plate.


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