Abstract
Materials with the biggest increase in usage of light-weighting cars and trucks aren't aluminium, magnesium or some other alternative metals. Instead, it is the high strength steel sheets, such as extra-low carbon steels, that have shown the most growth in the light-vehicle market. Reducing weight by using thinner high strength steel sheets allows the car companies to meet reduced fuel requirements without compromising the size and safety of the cars as well as the buyers' affordability. Extra-low carbons steels, commonly known as Interstitial Free (IF) steels have been widely used for automobile plates. IF-steels have also been widely used in many kinds of products by press deformation particularly of stamped components in automobile application because of their excellent deep-draw ability and high resistance aging. All specimen have been tested using the plain bending fatigue-testing machine at 30Hz with capacity of 1.96Nm. Successive replica observations are performed to observe the fatigue crack initiation and fatigue crack propagation behavior.
