Abstract AlSi10Mg manufactured by laser powder bed fusion (or selective laser melting) benefits from a very fine microstructure that imparts significant mechanical strength to the material compared to the cast alloy. The build platform temperature stands out as a significant processing parameter influencing the microstructure as it affects the cooling rate and thermal gradient during manufacturing. Setting the build platform temperature to 200°C yields a negligible residual stress level. However, the strength is lower compared to that obtained using a build platform temperature of 35°C, with a similar fracture strain. A detailed 3D microstructural analysis involving focused ion beam/scanning electron microscopy tomography was performed to describe the connectivity and size of the Si-rich eutectic network and link it to the strength and fracture strain. The coarser microstructure of the 200°C build platform material is more prone to damage. The α-Al cells as well as the Si-rich precipitates present a larger size in the 200°C material, the latter thus having a lower strengthening effect. The Si-rich eutectic network is also less interconnected and has a larger thickness in the 200°C material. An analytical model is developed to exploit these microstructural features and predict the strength of the two materials.

中文翻译：

---

AlSi10Mg激光粉末床熔合过程中构建平台温度对组织、强度和延展性的影响

摘要 通过激光粉末床熔融（或选择性激光熔化）制造的 AlSi10Mg 受益于非常精细的微观结构，与铸造合金相比，该微观结构赋予材料显着的机械强度。构建平台温度是影响微观结构的重要加工参数，因为它会影响制造过程中的冷却速率和热梯度。将构建平台温度设置为 200°C 产生的残余应力水平可以忽略不计。然而，与使用 35°C 的构建平台温度获得的强度相比，强度较低，具有相似的断裂应变。进行了涉及聚焦离子束/扫描电子显微镜断层扫描的详细 3D 显微结构分析，以描述富硅共晶网络的连通性和大小，并将其与强度和断裂应变联系起来。200°C 构建平台材料的较粗糙的微观结构更容易损坏。α-Al 电池以及富硅沉淀物在 200°C 材料中呈现出更大的尺寸，因此后者具有较低的强化效果。富硅共晶网络也较少互连，并且在 200°C 材料中具有更大的厚度。开发了一种分析模型来利用这些微观结构特征并预测两种材料的强度。α-Al 电池以及富硅沉淀物在 200°C 材料中呈现出更大的尺寸，因此后者具有较低的强化效果。富硅共晶网络也较少互连，并且在 200°C 材料中具有更大的厚度。开发了一种分析模型来利用这些微观结构特征并预测两种材料的强度。α-Al 电池以及富硅沉淀物在 200°C 材料中呈现出更大的尺寸，因此后者具有较低的强化效果。富硅共晶网络也较少互连，并且在 200°C 材料中具有更大的厚度。开发了一种分析模型来利用这些微观结构特征并预测两种材料的强度。