Large grains are usually caused by high initial forging temperature and insufficient deformation degree, or high final forging temperature, or deformation degree falling into critical deformation area.
Free forging is a kind of forging process which uses simple universal tools, or directly exerts external force between the upper and lower anvils of forging equipment to deform the blank and obtain the required geometry and internal quality. The forging produced by free forging is called free forging.
According to the production line of the product, the forging of construction machinery can only be put into use after it meets certain requirements and reaches the standard. Now let's talk about how to reach the standard.
For the alloy with high degree of hard deformation alloy, slow deformation shall be adopted as far as possible, and the deformation amount of each stroke of each hammer or press shall be controlled at about 20% generally.