Effect of surface finish on fatigue of stainless steels
The effect of surface finish on fatigue limit of Type 304 austenitic stainless steels has been investigated. Fatigue specimens with different surface conditions were obtained by changing the final cutting condition of lathe-turning. The surfaces and near surface microstructures were characterised by...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2009
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| Summary: | The effect of surface finish on fatigue limit of Type 304 austenitic stainless steels has been investigated. Fatigue specimens with different surface conditions were obtained by changing the final cutting condition of lathe-turning. The surfaces and near surface microstructures were characterised by electron backscatter diffraction (EBSD), surface profilometry, hardness testing and X-ray diffraction for residual stress measurement. The fatigue limits were determined using a rotating-bending machine by means of the staircase method. Machined samples were compared with samples annealed to remove residual stresses, and also samples that were annealed and electro-polished. Arrested crack nuclei in run-out (>107 cycles) fatigue tests were observed. The residual stress measured at the surface was found to be the dominant parameter, which changes the fatigue limit relative to that of electropolished and annealed microstructures. The effect of surface roughness is negligible. |
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