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Microstructure Analysis and Strength Evaluation of Press-Worked Product
Published October 07, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The work-hardening effects due to the pre-straining from uniaxial and multiaxial direction improved tensile strength. The strength of press-worked product was higher than that of uniaxial pre-straining steel sheet. The strength of mild steel sheet, that was the blank material, increased near to the 590 MPa grade high tensile strength steel sheet after three stages of press working. In a similar manner, the hardness of press-worked material was higher than that of uniaxial pre-straining. The multiaxial and uniaxial straining increased the dislocation density. The hardness value of the uniaxial pre-straining sheets and the press-worked product in each process was proportional to the tensile strength. The dislocation cell in the press-worked product indicated fine and equiaxial grain. On the other hand, the cell in the specimen after uniaxial tensile loading indicates coarse grain that was extended to the tensile direction. The dislocation cell size and shape was deeply related to the work hardening due to the multiaxial and uniaxial plastic deformation.