This study reports the superior tensile properties of laser powder bed fused (L-PBF) Hastelloy X compared to wrought, exhibiting enhanced yield strength and improved ductility. By analyzing the tensile response of a variety of microstructures ranging from fully dendritic to fully solutionized, the as-solidified fine inter-dendritic region network was determined to be responsible for this superiority. Characterized by high chemical gradients, the inter-dendritic regions limited motion of dislocations, blocked the formation of long deformation bands, and promoted the uniform distribution of plastic strain. Further, a deformation mechanism not well known for Hastelloy X, i.e. deformation twinning, was observed and analyzed.

这项研究报告说，与锻造相比，激光粉末床熔合（L-PBF）哈氏合金X具有优异的拉伸性能，具有增强的屈服强度和改善的延展性。通过分析从完全树枝状到完全固溶的各种微观结构的拉伸响应，确定了刚凝固的精细树突间区域网络是这种优势的原因。以高化学梯度为特征，树突间区域限制了位错的运动，阻止了长形变带的形成，并促进了塑性应变的均匀分布。此外，观察和分析了哈氏合金X尚不为人所知的变形机理，即变形孪晶。