|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture: Developing Predictive Capabilities
||The Influence of Orientation and Processing Method on Fatigue Crack Growth Behavior of AM Stainless Steel
||Christine Smudde, Michael Hill, Christopher San Marchi, Jeffery Gibeling
|On-Site Speaker (Planned)
Additive manufacturing (AM) offers technological advancements supporting innovative engineering design, but also introduces challenges in fatigue critical applications. Due to highly localized heating and the resulting temperature gradients, AM parts often have significant residual stress and distinctive grain patterns that contribute to unique mechanical behaviour. In this study, fatigue crack growth resistance of AM Type 304L stainless steel produced by both directed energy deposition and powder bed fusion was evaluated for crack growth parallel and perpendicular to the build direction. Decreasing alternating stress intensity factor tests were used to assess fatigue crack growth behaviour in the near threshold regime. Constant applied alternating stress intensity factor tests were used to reveal variations in fatigue crack growth rates attributed to residual stress and microstructural contributions for both materials. Finally, assessments of microstructure through large area SEM images and crack path profiles revealed non-uniform grain morphology and varying levels of tortuosity, respectively.
||Additive Manufacturing, Mechanical Properties, Iron and Steel