Sustainable TiC-Fe-based cermets have been fabricated by adopting an Additive Manufacturing route based on laser powder bed fusion technology (L-PBF). The objective is to produce crack-free cermet components by employing novel multiple laser scanning techniques with variations in laser process parameters. Electron backscatter diffraction analysis (EBSD) was used to study the microstructure and microtexture evolution with variations in laser process parameters. The investigation revealed that adjusting the preheating scan speed (PHS) and melting scan speed (MS) influenced the growth and nucleation of TiC phases. Lowering these speeds resulted in grain coarsening, while higher scan speeds led to grain refinement with larger sub-grain boundaries. Moreover, a high scanning speed increases the degree of dislocation density and internal stress in the fabricated cermet parts. Notably, it is revealed that decreasing the laser scan speed enhanced the proportion of high-angle grain boundaries in the cermet components, signifying an increase in material ductility.

中文翻译：

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增材制造 TiC-Fe 基金属陶瓷微观结构和微观织构演变的 EBSD 研究——多次激光扫描的影响

采用基于激光粉末床熔融技术 (L-PBF) 的增材制造路线制造了可持续的 TiC-Fe 基金属陶瓷。目标是通过采用新颖的多重激光扫描技术以及激光工艺参数的变化来生产无裂纹的金属陶瓷部件。电子背散射衍射分析 (EBSD) 用于研究随激光工艺参数变化的微观结构和微观纹理演变。研究表明，调整预热扫描速度（PHS）和熔化扫描速度（MS）会影响TiC相的生长和成核。降低这些速度会导致晶粒粗化，而较高的扫描速度会导致晶粒细化，并具有更大的亚晶界。此外，高扫描速度会增加所制造的金属陶瓷零件中的位错密度和内应力程度。值得注意的是，研究表明，降低激光扫描速度会增加金属陶瓷成分中大角度晶界的比例，这意味着材料延展性的增加。