Abstract
In the present study, the effect of microstructure of 16Mn steel on fatigue crack initiation (FCI) life and fatigue crack propagation (FCP) rates was experimentally investigated under two different conditions,i.e., as-received condition and high-temperature normalized (H.T.N.) condition. The microstructure of 16Mn steel under the as-received condition is ferrite and pearlite, which corresponds to that of the base metal of welded elements, and the microstructure under the H.T.N. condition is mainly coarse Widmanstatten structure, which can be thought of as the simulated microstructure at the weld toe. The fatigue test results show that the high-temperature normalization results in the increase of FCP rates in near-threshold region and the decrease of both FCI and FCP thresholds, and FCI life of 16Mn steel. Little effect of the microstructure is observed on the FCP mechanism in the intermediate range (da/dN=10−8 to 10−6 m/cycle). Based on the test results and analysis, the general expressions are given for both FCI life and FCP rates under the two conditions. It is pointed out that which of the test results should be applied to prediction of FCI life and FCP life depends upon the FCI location and FCP path in the welded elements.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
