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Role of microstructure and residual stresses on fatigue crack initiation of carbonitrided steels
Author(s) -
Lesage Jacky,
Chicot Didier,
Karaishi Mohamed Al
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901670
Subject(s) - bainite , austenite , microstructure , materials science , metallurgy , residual stress , fatigue testing , composite material
In this paper the role of microstructure and residual stresses on fatigue crack initiation of gaseous carbonitrided steels is examined. Optimum for austenite content in the case is investigated for microstructures containing bainite and for those without bainite. Fractographic study suggests subsurface initiation sites for notched specimens when austenite content is high and initiation sites at the surface when austenite is low.