Laser based powder bed fusion additive manufacturing offers the flexibility to incorporate standard and user-defined scan strategies in a layer or in between the layers for the customized fabrication of metallic components. In the present study, four different scan strategies and their impact on the development of microstructure, texture, and residual stresses in laser powder bed fusion additive manufacturing of a nickel-based superalloy Inconel 718 was investigated. Light microscopy, scanning electron microscopy combined with electron backscatter diffraction, and neutron diffraction were used as the characterization tools. Strong textures with epitaxially grown columnar grains were observed along the build direction for the two individual scan strategies. Patterns depicting the respective scan strategies were visible in the build plane, which dictated the microstructure development in the other planes. An alternating strategy combining the individual strategies in the successive layers and a 67° rotational strategy weakened the texture by forming finer microstructural features. Von Mises equivalent stress plots revealed lower stress values and gradients, which translates as lower distortions for the alternating and rotational strategies. Overall results confirmed the scope for manipulating the microstructure, texture, and residual stresses during laser powder bed fusion additive manufacturing by effectively controlling the scan strategies.

基于激光的粉末床熔合添加剂制造提供了灵活性，可以将标准和用户定义的扫描策略合并到层中或层之间，用于定制的金属组件制造。在本研究中，研究了四种不同的扫描策略及其对镍基超合金Inconel 718激光粉末床熔合增材制造中显微组织，织构和残余应力发展的影响。光学显微镜，扫描电子显微镜结合电子反向散射衍射和中子衍射被用作表征工具。沿两个单独扫描策略的构建方向观察到具有外延生长的柱状晶粒的强纹理。在构建平面中可以看到描述各个扫描策略的模式，决定了其他平面的微观结构发展。交替的策略将连续层中的各个策略与67°旋转策略相结合，通过形成更精细的微结构特征来减弱纹理。冯·米塞斯（Von Mises）的等效应力图显示了较低的应力值和梯度，对于交替和旋转策略，这表示较低的变形。总体结果证实了通过有效控制扫描策略来控制激光粉末床熔融添加剂制造过程中微观结构，织构和残余应力的范围。冯·米塞斯（Von Mises）的等效应力图显示了较低的应力值和梯度，对于交替和旋转策略，这表示较低的变形。总体结果证实了通过有效控制扫描策略来控制激光粉末床熔融添加剂制造过程中微观结构，织构和残余应力的范围。冯·米塞斯（Von Mises）的等效应力图显示了较低的应力值和梯度，对于交替和旋转策略，这表示较低的变形。总体结果证实了通过有效控制扫描策略来控制激光粉末床熔融添加剂制造过程中微观结构，织构和残余应力的范围。