| Advanced High Strength Steels (AHSS) are needed to meet the requirements of the automotive industry, which include passenger safety and fuel economy. Transformation-induced-plasticity (TRIP) aided steels show a remarkable energy absorption capability during straining and a beneficial combination of high strength and good ductility, which make them suitable for crash-relevant automobile parts with large weight reduction.; This project was focused on the weldability of a TRIP-aided steel welded by these two advanced welding methods. Weldability of dual phase (DP) steel was also studied as a reference line for TRIP steel.; Three investigations were carried out: (1) Microstructural characteristics of the fusion zone and heat affected zone; (2) Mechanical properties of the welds; and (3) Retained austenite in the welds and its influence on the welds.; Both HPDLW and HFIW produced good weld joints for DP600 steel. (Abstract shortened by UMI.)... |
