New High Strength Steels Help Automakers Reach Future Goals for Safety, Affordability, Fuel Efficiency and Environmental Responsibility

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

“…In comparison with traditional low carbon and high strength low alloy steels, dual phase (DP) steels provide a combination of good formability and strength [4,5]. DP steels are attractive to automakers as they can offer safety, affordability, fuel efficiency, and environmental responsibility [6][7][8]. Wang et al [9] studied the high strain rate behavior of high strength DP steels.…”

Determination of the flow stress of five AHSS sheet materials (DP 600, DP 780, DP 780-CR, DP 780-HY and TRIP 780) using the uniaxial tensile and the biaxial Viscous Pressure Bulge (VPB) tests

“…This maybe attributed to the transformation mentioned above. Shaw and Zuidema (2001) reported that the austenite-tomartensite transformation of TRIP steels is easier under biaxial tension than under compression. Thus, if used in drawing applications, TRIP steels shows relatively good performance since the transformation strengthens the side wall, while the flange region stays soft and easy to draw.…”

“…For TRIP steels, strain hardening at the beginning takes place by the interaction of dislocations with second phases existing in the matrix as discussed by (Shaw and Zuidema, 2001). Later, when the material starts to loose its hardening characteristics, the retained austenite transforms to martensite (the strain at which phase transformation takes place depends mainly on the amount of carbon in the alloy).…”

Advanced steels for lightweight automotive structures

“…In contrast, HSLa steel is mostly ferrite with evidence of fine and well dispersed niobium, titanium or vanadium carbides. Dual phase steels generally contain 10-70% volume fraction martensite, where increasing martensite content corresponds to increases in tensile strength (Shaw and Zuidema, 2001). Dual phase steels are also notable for their high tensile strengths compared to conventional HSLa steels at similar yield strengths, their high work hardening rates, and higher energy absorbing capabilities.…”