Three elements of heat treatment for forgings
1. size effect:
The mechanical properties of forged steel vary with the shape and size. Generally, the larger the size, the deeper the hardening depth of the heat treatment in the same cooling medium, and the lower the mechanical properties.
2. Mass effect:
The quality (weight) of the forgings is different, and the final result of the heat treatment is different, especially in the quenching process. Generally, the thicker the workpiece, the harder it is to harden. The larger the workpiece, the harder it is to quench. The difference in heat treatment results due to the difference in quality is large.
The mass effect is to analyze the quenching effect from the perspective of the size of the workpiece. Hardenability is the quenching effect from the material perspective of steel. The mass effect of a workpiece with good hardenability is small, that is, the hardenability improves the mass effect.
3. Shape effect:
The quenching effect of the forgings is affected by the shape of the parts. The shapes of the rods, plates and balls are different, and their quenching effects are different. In addition, the cooling methods of different quenching parts on the same parts are different, and the quenching effect is also different.
The size, quality and shape of the forging are the three elements of the forging. When formulating the heat treatment process specification, the three elements of the heat treatment process must be combined with the three elements of the heat treatment workpiece, and cannot be divided. When referring to the heat treatment CCT, TTT and other curves in various manuals, the three elements of the heat treatment forgings and the surface and workpiece of the forgings cannot be ignored. The difference in temperature between heating and cooling of the heart.