Abstract
AbstractThe fatigue behaviour of additively manufactured (AM) 316L stainless steel is investigated with the main emphasis on internal porosity and surface roughness. A transition between two cases of failure are found: failure from defects in the surface region and failure from the internal defects. At low applied load level (and consequently a high number of cycles to failure), fatigue is initiating from defects in the surface region, while for high load levels, fatigue is initiating from internal defects. Porosities captured by X‐ray computed tomography (XCT) are compared with the defects initiating fatigue cracks, obtained from fractography. The fatigue data are synthesised using stress intensity factor (SIF) of the internal and surface defects on the fracture surface.
Highlights
| INTRODUCTIONFor industries like aerospace, medical, energy, and automotive.[6,7] there are some challenges when
The fatigue behaviour of 316L stainless steel specimens produced by selective laser melting (SLM) has been investigated with the main emphasis on the effect of surface roughness and porosity
Fractography revealed that for the low load levels in the High Cycle fatigue (HCF) regime, specimens failed from defects in the surface region, while the higher load levels, the specimens failed from internal defects
Summary
For industries like aerospace, medical, energy, and automotive.[6,7] there are some challenges when. The specimens either showed fatigue initiation from internal defects or surface defects; one example of FIGURE 2 Load‐displacement curve from static loading under displacement control. Failure from static loading is shown, the fracture surface displays a cup‐cone morphology, and the core of the specimen displays several regions of defects.
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