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Fatigue properties of conventionally manufactured and micro-powder-injection-moulded 17-4PH micro-components

: Slaby, S.A.; Kraft, O.; Eberl, C.

Fulltext ()

Fatigue and Fracture of Engineering Materials and Structures 39 (2016), No.6, pp.780-789
ISSN: 8756-758X
ISSN: 0160-4112
ISSN: 1460-2695
Deutsche Forschungsgemeinschaft DFG
SFB 499;
Journal Article, Electronic Publication
Fraunhofer IWM ()
micro-powder injection moulding (PIM); tension-tension-fatigue testing; micro-samples; 17-4PH stainless-steel

Micro-powder injection moulding (PIM) is a promising mass manufacturing technique for the microsystem technology. Because typical applications - like sensors or actuators - need to withstand serious mechanical loadings, the investigations of the mechanical properties are of vital importance. Therefore, we implemented a small-scale testing setup that enables tensile and tension-tension-fatigue testing of freestanding micro-samples. This allowed for investigating tensile and fatigue properties of conventionally produced and PIM 17-4PH stainless-steel thin membranes. The conventionally produced samples were machined from bulk material and showed properties and lifetimes comparable with the best bulk samples. The PIM samples showed a weaker but more ductile behaviour, due to a ferritic phase and SiO2 inclusions. But their ultimate tensile strength of up to S-U=1021 +/- 48MPa and their relative fatigue strength of approximate to 46% S-U (R=-1) are still comparable with average bulk values. This indicates the high potential of PIM materials.