选区激光熔化成形AlSi10Mg组织与拉伸性能的各向异性研究

被引：47

作者：

侯伟

陈静

储松林

王修专

杨志逸

张毓祺

滕伟斌

机构：

[1] 中国航发控制系统研究所D使能研发技术联合实验室

来源：

中国激光 | 2018年 / 45卷 / 07期

基金：

国家重点研发计划;

关键词：

材料; 选区激光熔化; AlSi10Mg; 各向异性; 显微组织; 拉伸性能;

D O I：

暂无

中图分类号：

TG146.21 []; TG665 [光能加工设备及其加工];

学科分类号：

摘要：

采用选区激光熔化(SLM)技术成形了Al Si10Mg合金,研究了该合金的显微组织及室温拉伸性能。结果表明:SLM成形Al Si10Mg合金具有细小的显微组织与较高的室温拉伸性能,且存在明显的各向异性;SLM成形过程中的高冷速显著细化了初生α-Al枝晶,熔池内部及边缘不同的凝固条件不仅使两处α-Al枝晶的尺寸不同,而且决定了α-Al枝晶的生长形态,但整体呈外延生长;结合试样不同取向上枝晶间Al-Si共晶组织的形态及演化规律,揭示了合金组织的各向异性;室温拉伸试样沿沉积方向(纵向)与扫描方向(横向)的强度相当,但延伸率相差近一倍,合金性能的各向异性主要表现在延展性上;拉伸断口SEM形貌特征体现了试样的断裂机理,结合横、纵向试样断口处的韧窝尺寸、Al-Si共晶组织形态、微裂纹形成等因素说明了断裂方式为沿晶断裂;SLM成形Al Si10Mg的组织与性能均优于传统铸件,有利于SLM技术在航空发动机控制系统典型复杂零部件的设计制造中实现工程化应用。

引用

页码：67 / 77

页数：11

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