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Improvement of Tensile Strength of Press-Worked Product Pre-Strained From Triaxial Direction
Published May 23, 2007 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
Work-hardening effects due to the pre-straining from triaxial direction improved tensile strength of press-worked product. The tensile specimen was cut off from the automobile product formed by three stages of press-working process. From the results of tensile tests, 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 increased with the processing of forming. The dislocation density of press-worked material was measured by x-ray diffraction. The triaxial straining in press-working process increased the dislocation density. The hardness value of the blank material and the press-worked product in each process was proportional to the tensile strength. The tensile strength of the press-worked product could be uniformly estimated by the measurement of the products' hardness irrespective of the straining process.