Transactions of Materials and Heat Treatment

Title：Influence of forging process on manganese sulfide and mechanical properties for free cutting steel

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ClassificationCode：TG316.4

year,vol(issue):pagenumber：2021,46(5):12-18

Abstract：

The influences of forging process on morphology, aspect ratio, sizes, the maximum chord length, content and mechanical properties of manganese sulfide in free cutting steel were studied by OM, SEM, ASPEX SEM-EDS etc. The results show that the manganese sulfide in the as-cast test steel is approximately spherical or spindle-shaped, most of manganese sulfide is distributed arbitrarily in the matrix, and a small amount of manganese sulfide is distributed in chains along the grain boundary. Furthermore, the manganese sulfide in the forged test steel elongates along the forging direction, and compared with the as-cast test steel, its aspect ratio and the maximum chord length increase, the sizes decrease, and the content per unit area increases. In addition, the tensile fracture of as-cast test steel is mainly characterized by cleavage steps and river pattern, and the fracture mode is brittle fracture, while the tensile fracture of forged test steel is a mixed cleavage and dimple morphology, and the fracture mode is ductile fracture. Finally, the tensile strength, yield strength, elongation after fracture, reduction of area and impact toughness of the forged test steel are obviously improved compared with those of the as-cast test steel.

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王英虎（1992-），男，硕士，工程师 E-mail：hihihowareyou@163.com

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