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Cite this article:
. . Acta Metall Sin, 2007, 43(10): 1031-1036 .
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Abstract Ultra high cycle fatigue behavior of a new kind of medium-carbon high strength spring steel (NHS1) was investigated and its fractographs were observed by means of field emission scanning electron microscope (FESEM). It was found that the S-N curve of NHS1 steel is a step-wise curve, and the fatigue limit eliminated in 109 cyc regime. Analysis of fractographs shows that surface fracture occurred in the region of short fatigue life at high stress amplitude level and interior inclusion-induced fracture in the region of long fatigue life at low stress amplitude level. Fish-eye marks were always observed around the interior inclusions on the fracture surfaces and a granular bright facet (GBF) was observed in the vicinity around the inclusion. The stress intensity factor range at GBF boundary △KGBF is 3.6 MPa•m1/2, which is just equal to the threshold stress intensity range △Kth. The stress intensity factor range at fish-eye boundary△KFE is also a constant and is 10 MPa•m1/2.
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Received: 30 March 2007
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