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Title: Applications of High Strength Steels in Hydroforming Comparison Dual Phase vs. HSLA
Document #: SAE 2001-01-1133
Presented at: SAE 2001 World Congress, March 2001, Detroit, MI.
Author: Paul McKune, Ming Chen & Ming Shi, U. S. Steel.
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Abstract: Dual Phase (DP) high strength steel is widely used in Europe and Japan for automotive component applications, and has recently drawn greater attention in the North American automotive industry for improving crash performance and reducing weight. In comparison with high-strength low-alloy (HSLA) steel grades with similar initial yield strength, DP steel has the following advantages: higher strain hardening, higher energy absorption, higher fatigue strength, higher bake hardenability, and no yield point elongation. The paper compares the performance of DP and HSLA steel grades before, during, and after hydroforming. Computer simulation results show that DP steel demonstrates more uniform material flow during hydroforming, better crash performance and less wrinkling tendency.
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