Fatigue of a dual- phase steel
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the standpoint of energy efficiency in automobiles it is desirable t o use high strength steels t o produce lightweight structures. However, the h i g h e r the strength of the s t e e l the lower its ductility and formability; for example, the total elongations for h o t rolled low carbon (HRLC), SAE 950X and 980X steels are approximately 35, 27 and 18 pct, respectively. Thus SAE 980X which, being the strongest of these sheet s t e e l s would produce the l a r g e s t weight savings, is the most difficult t o f o r m . The r e c e n t development of more ductile high strength dual-phase steels 1,2 could help to alleviate some of the f o r m a bility problems. Dual-phase steels consist of a mixture of 15 t o 18 pct martensite in a fine grained (
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