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Application of Ultra High Strength Steels(UHSS) in car BIW(body in white) is regarded as the most economic way to satisfy the lightweight goal as well as the automobile safety. In this paper, the formability of the 3rd generation Advanced High Strength Steels(AHSS) QP980 was studied and compared with that of the 1st generation AHSS DP980. The static uni-axial tensile test was conducted and the longitudinal...
The hole expansion ratio is a key indicator to evaluate stretch flanging performance of steel sheets, which is usually obtained by hole expanding test using cylindrical or conical punch. According to ISO 16630-2009(Metallic materials -- Sheet and strip -- Hole expanding test), hole expanding tests of 15 types of steel sheet were conducted using conical punch. The results indicated that there was obvious...
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