Fatigue properties of conventionally manufactured and micro-powder-injection-moulded 17-4PH micro-components
详细信息 查看全文
- 作者：S. A. Slaby ; O. Kraft and C. Eberl
- 关键词：fatigue ; mechanical properties ; micro-powder injection moulding ; small scale testing ; 17-4PH ; &mu ; PIM
- 刊名：Fatigue & Fracture of Engineering Materials & Structures
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：39
- 期：6
- 页码：780-789
- 全文大小：3254K
- ISSN：1460-2695
文摘
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 SiO2 inclusions. But their ultimate tensile strength of up to SU = 1021 ± 48 MPa and their relative fatigue strength of ≈46% SU (R = −1) are still comparable with average bulk values. This indicates the high potential of μPIM materials.