Roll-Bonded 300M/1010 Steel Metal-Metal Laminates: Forgeability, Toughness, Fatigue, and Stress Corrosion

摘要

The fabrication of Alloy 300M/1010 steel metal-metal laminates in thick section by hot bonding is described and discussed. The results of the forgeability testing of the roll-bonded laminate plate and the tensile, fracture toughness, fatigue, and stress-corrosion cracking properties of the roll-bonded and roll-bonded and forged laminate material and 300M monolithic control material are reported, evaluated, and discussed. Two thick laminate billets in which eighteen layers of 300M low alloy steel separated by seventeen interleaves of 1010 mild steel have been prepared by hot roll bonding from plate and sheet stock. Cylindrical specimens machined from these billets have been forged in both open and closed dies and the laminate forgeability established. The forgeability of the laminate in the longitudinal direction, i.e., material flow perpendicular to the lamellar plane, is limited to low strains, less than -27%, by the hot strength of the interlamellar bonds and the plastic buckling resistance of the laminate. The forgeability in the transverse direction, i.e., material flow parallel to the lamellar plane, is limited only by the acceptable reorientation of laminate fiber caused by die shape and the frictional characteristics of the process, the transverse flow of the layers and interleaves being completely stable in the 300M/1010 system.