Does different forging ratio affect the quality of forgings?

The microstructure and mechanical properties of forgings are related to many factors, and the forging ratio isForgingsOne of the main factors of quality. Today we come to understand the forging ratio.

The forging ratio is an expression of the degree of metal deformation during forging. The greater the forging ratio, the higher the degree of deformation of the forging, and the degree of deformation is directly related to the final inclusion size of the material, the degree of crushing of the material eutectic carbide, the fiber flow direction and density of the material after forming, etc., which have a greater impact on the overall performance of the material.

At present, there are three kinds of process schemes to improve the uniformity of forging ratio, which are to change the boundary conditions of blank and die, change the shape of blank and change the way of upsetting deformation. And by changing the flat anvil upsetting deformation mode can effectively improve the forging ratio and geometry uniformity.

different forging ratioForgingsThe distribution of the forging ratio (I. e., the degree of deformation) is uneven, and is clearly divided into a large forging ratio region, an average forging ratio region, and a small forging ratio region. Mechanical properties experiments show that under the same heat treatment conditions, the plastic deformation of a certain forging ratio can significantly improve the strength index and plasticity index of rolled steel, when the forging ratio reaches a certain value, the microstructure and properties of forgings change sharply, its strength is improved to better, but the toughness is significantly reduced. Under the same strain rate, the greater the forging ratio (I. e., the degree of plastic deformation), the more obvious the dynamic recrystallization in the forging tissue, and when the forging ratio reaches a certain value, the original grain will be replaced by the new recrystallization grain, and a more complete dynamic recrystallization will occur. Therefore, the forging ratio has a great influence on the quality of forgings.