ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The effect of plasma radical nitriding treatment on fatigue properties of SCM435 steel insuper long life region was investigated. Fatigue tests were carried out using a dual-spindle rotatingbending fatigue-testing machine at room temperature in air for the specimens nitrided at 773 K and823 K for 3 hrs. The fatigue strength of nitrided specimen was greater than that of un-nitridedspecimen and the crack initiation mode changed from the surface cracking of un-nitrided specimento the subsurface cracking of nitrided specimen. Hardening layer and compressive residual stresswere formed by nitriding, which resulted in the improvement of the fatigue strength. The stressintensity factor was calculated using facet area in Fish-eye fracture mode. As a result, the stressintensity factor indicated almost constant value, ~ 3-4 MPa·m1/2, regardless of the number of cyclesto failure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.266.pdf
