|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Mechanisms of Fracture in Laser Powder Bed Additive Manufactured Superalloys
||Håkan Brodin, Per Sandahl
|On-Site Speaker (Planned)
The current paper reports the outcome of thermomechanical and fatigue testing of Hastelloy X, a well-known gas turbine material. In the current paper the alloy is produced by laser powder bed additive manufacturing. The results strongly indicates that the alloy produced by additive manufacturing suffers when exposed to high temperature. A fine-grained material in combination with weak grain boundaries is put forward as an explanation for the behaviour. The microstructure of additive manufactured alloys is anisotropic and fine-grained. This has an impact on the material response to tensile properties, crack initiation, crack growth and creep. Several different defects are contributing to the damage development. Weak grain boundaries has an effect in how fatigue cracks initiate and develop. Furthermore, the grain boundaries contain small voids that significantly contribute to creep crack formation and coalescence. Fatigue damage also is influenced by spatter particles from the weld process and unmolten powder particles.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)