Banded structure of forged flange
The forging banded structure of forged flange is a kind of structure with banded distribution of ferrite and pearlite, ferrite and austenite, ferrite and bainite, ferrite and martensite in forgings. They mostly appear in Hypoeutectic steel, austenitic steel and semi martensitic steel of forged flange. This kind of structure is the banded structure produced during the forging deformation of the forged flange when two phases coexist, which can reduce the transverse plastic pointer of the material, especially the impact toughness. It is often easy to crack along the ferrite belt or the junction of two phases when forging or parts are working.
Local filling of forged flange is insufficient
The lack of local filling of forged flange mainly occurs in the ribs, convex corners, corners and fillets of forged flange, and the size does not meet the drawing requirements of forged flange. The possible reasons are: ① low forging temperature and poor metal fluidity; ② Insufficient tonnage of equipment or insufficient hammering force; ③ The design of the blank making die is unreasonable, and the blank volume or section size is unqualified; ④ Oxide scale or welding deformed metal is accumulated in the mold bore.
Under pressure of forged flange
The forging undervoltage of forged flanges refers to the general increase in the size of forged flanges perpendicular to the parting surface of forged flanges, which may be caused by: ① the low forging temperature of forged flanges. ② The tonnage of the equipment is insufficient, the hammering force of the forged flange is insufficient or the hammering times are insufficient.
