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Effects of morphology on the tensile and fatigue behaviour of a dual‐phase steel
Author(s) -
Sun Zhengming,
Wang Zhongguang,
Ai Suhua
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198900277
Subject(s) - materials science , dual phase steel , microstructure , martensite , ultimate tensile strength , composite material , hardening (computing) , ductility (earth science) , fatigue limit , annealing (glass) , monotonic function , ferrite (magnet) , quenching (fluorescence) , creep , mathematical analysis , mathematics , physics , layer (electronics) , quantum mechanics , fluorescence
Duplex ferrite/martensite microstructures with the same fibrous, network and blocky martensite content (23%) were developed by careful heat treatments. The monotonic and cyclic properties were investigated. The stress‐life behaviour (S–N curves) was also determined. The results demonstrated that, of the three microstructures the fine fibrous structure produced by intermediate quenching is the best in terms of strength and ductility while the network structure developed by intercritical annealing exhibits the worst properties. However, the network structure shows the highest potentiality of cyclic hardening and the fine fibrous the lowest. The network structure has the lowest fatigue limit. The blocky structure, the monotonic behaviour of which is in between, shows the best fatigue life. The fine fibrous structure has a high cycle fatigue life equivalent to that of blocky structure but exhibits the lowest fatigue resistance in the short life range.