|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture: Developing Predictive Capabilities
||Short-crack Growth Behavior in Additively Manufactured AlSi10Mg
||Robert K. Rhein, Qianying Shi, J Wayne Jones, Srinivasan Arjun Tekalur, Jason W Carroll, Kathleen Chou
|On-Site Speaker (Planned)
The very high cycle fatigue behavior of an additively manufactured aluminum alloy, AlSi10Mg-T6, has been studied to better understand the role of process related defects on fatigue life and initiation. Ultrasonic fatigue methodologies were used for the determination of an operative fatigue strength. Fatigue crack growth rates were determined for small fatigue cracks that initiated and grew from artificial (FIB) surface defects in specimens subjected to ultrasonic fatigue. X-ray computed tomography (CT) was used in an effort to detect possible crack initiation and growth in specimens cycled for fractions of the nominal VHCF fatigue strength. Small crack growth from FIB-produced micronotches appeared to be transgranular and noncrystallographic. While modest increase in size of some features identified by x-ray CT for interrupted fatigue tests was observed, particularly at defects characterized as flat or oblate spheroids, no definitive evidence of the emergence of a fatal crack from a single defect was found.
||Additive Manufacturing, Aluminum,