Abstract: The forging process of the high-seed stee1s having been simulated and researched by the rigid-viscoplastic FEM in the microcomputer, the reason that cracks may occur at the center area of the billet is the existence of the double bulging in the forging process. When it was forged to plat, high cross tensile stress in the billet developed and exceeded the strength of the billet. Acoordingly, the reasonable parameters and the steps made the forging technology better were put forward, and the results analyzed by rigidviscoplastic FEM were corresponding to practical resulus.

Key words: Crack, FEM, Flat ingot forging, High-speed steel, Rigid -viscoplastic