研究目的
Investigating the effects of base plate preheating during Selective Laser Melting (SLM) on part density, crack formation, internal stresses, microstructure, and mechanical properties for four different materials.
研究成果
Base plate preheating during SLM can reduce thermal stresses and crack formation, densify parts when laser energy is insufficient, and influence microstructure and mechanical properties depending on the material. However, its effects vary significantly among different materials due to their specific phase transformations and properties.
研究不足
The study is limited to four materials and preheating temperatures up to 400°C. The effect of prolonged exposure to preheating temperatures was only significantly observed for Hastelloy X.
1：Experimental Design and Method Selection:
The study applied base plate preheating up to 400°C during SLM of four materials to analyze its effects.
2：Sample Selection and Data Sources:
Four materials were selected: aluminum 7075 alloy, nickel alloy Hastelloy X, H13 tool steel, and CoCr.
3：List of Experimental Equipment and Materials:
An in-house developed SLM-machine equipped with a Yb:YAG fiber laser was used. Materialise Magics software was used for file preparation.
4：Experimental Procedures and Operational Workflow:
Preheating was applied using a resistive heating element. The temperature was controlled within ±
5：5°C. Data Analysis Methods:
The effects of preheating were analyzed regarding part density, crack formation, internal stresses, microstructure, and mechanical properties.
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