Application of In Situ Neutron Diffraction to Characterize Transient Material Behavior in Welding

摘要: A fundamental understanding of the transient and nonequilibrium material behavior during welding is essential in pursuit process control optimization to produce defect-free, structurally sound, reliable welds. The deep penetration capability neutrons into most metallic materials makes neutron diffraction a unique powerful tool structures properties. However, inadequate flux limits its application time-resolved study behavior. This article highlights recent developments toward situ measurement with two examples: (I) temperature thermal stresses friction-stir an aluminum alloy (II) solid-state phase transformation advanced high-strength steel under conditions comparable processes. These newly developed experimental approaches can be broadly applied other or thermomechanical processes for fast-changing state structural metals.