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材料工程  2002 

金属材料激光立体成形技术

Keywords: 激光立体成形,工艺特性,显微组织

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Abstract:

对激光立体成形技术的基本原理、发展状况以及成形特性、凝固组织形成规律进行了系统深入的研究,发现要获得理想的成形效果,就必须对单层涂覆厚度、单道涂覆宽度、搭接率等主要参数进行精确控制.在工艺研究的同时,对成形件微观组织形成规律进行了研究,发现其内部组织主要由外延生长的细长枝晶构成,其枝晶一次间距在10~30μm之间.在进一步严格控制工艺条件的基础上,获得了具有定向乃至单晶组织的试样.结合成形特性方面的研究结果,通过总结优化工艺,获得了不同合金的激光立体成形件,成形件内部致密,表面质量良好,无缺陷.

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