Abstract
Joining the High-Strength Steel Sheets Used in Car Body Production
Highlights
One of the most important issues in the automotive industry is the safe design, light weight and enhanced of crash response of specific auto-body structures
The grain refinement and precipitation hardening improve the strength of high-strength low-alloy (HSLA) steels; they are suitable for car body applications
The maximum shearing load for material HCT600X+Z was measured on the Resistance spot welding (RSW)-D sample with the corresponding displacement about 3.8 mm
Summary
One of the most important issues in the automotive industry is the safe design, light weight and enhanced of crash response of specific auto-body structures. The dual-phase steels offer a combination of high strength and good formability because of their microstructure in which the hard martensitic or bainitic phase is dispersed in a ductile ferritic matrix This type of steel is characterized by a good ability to redistribute stress and improve mechanical properties, including the yield strength. In the last two decades, the dual-phase steels have been used in the automotive industry to improve the impact resistance of components and reduce the total weight of the car body [4,5,6] In addition to these advantages, the dual-phase steels have good weldability, fatigue crack growth resistance and high deformation hardening coefficient. The ferrite in the HSLA steels is typically strengthened by grain refinement, precipitation hardening, and, to a lesser extent, solid-solution strengthening [11,12]
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