Fatigue Strength of Dissimilar Metal Friction Stir Welded Joint between TRIP Steel and Mild Steel

抄録

TRIP steel is an advanced high strength type steel and good performance for structural application in industries including high temperature products such as automobile and transportation. To optimize costs, the desired material must be selectively placed. In the current study, TRIP steel and mild steel are joined by friction stir welding under the optimal conditions. The fatigue strength of dissimilar joints is evaluated relative to the fatigue strength of the monolithic and FSWed base metal. Fatigue crack growth in the dissimilar joints was also studied to determine specific fatigue behavior by employing digital image correlation technology.