A B S T R A C T Micro-powder injection moulding (μPIM) 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 μPIM 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 μPIM samples showed a weaker but more ductile behaviour, due to a ferritic phase and SiO 2 inclusions. But their ultimate tensile strength of up to S U = 1021 ± 48 MPa and their relative fatigue strength of ≈46% S U (R = À1) are still comparable with average bulk values. This indicates the high potential of μPIM materials.Keywords fatigue; mechanical properties; micro-powder injection moulding; small scale testing; 17-4PH; μPIM. N O M E N C L A T U R Ee = strain ė = strain rate e f = fracture strain ē f = average fracture strain f = frequency N = number of cycles R = stress ratio RA = reduction of area R t = peak-to-valley roughness S = stress S 0.2 = proportional limit based on 0.2% plastic strain S a = stress amplitude S f 10% = fatigue strength based on 10% failure probability S f = fatigue strength based on 50% failure probability S f 90% = fatigue strength based on 90% failure probability S RC f = roughness-corrected fatigue strength based on 50% failure probability S max = maximum stress S u = ultimate tensile strength S u = average ultimate tensile strengthCorrespondence: C. Eberl.
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