激光选区熔化成形316L循环使用粉末特性演变机理研究

被引：6

作者：

路超 ^{[1
]}

肖梦智 ^{[1
]}

屈岳波 ^{[1
]}

尹燕 ^{[2
,3
]}

张瑞华 ^{[1
,2
]}

机构：

[1] 钢铁研究总院

[2] 阳江市五金刀剪产业技术研究院

[3] 兰州理工大学

来源：

中国激光 | 2021年 / 48卷 / 14期

关键词：

激光技术; 激光选区熔化; 循环使用; 氧化斑点; 粉末特性; 演变机理;

D O I：

暂无

中图分类号：

TG665 [光能加工设备及其加工];

学科分类号：

080201 ;

摘要：

在激光选区熔化技术中,激光-粉末的相互作用会对粉末特性产生重大影响,而在粉末循环使用过程中粉末特性的变化规律和演变机理尚不明确。本文利用激光粒度仪、扫描电子显微镜、能量色散型光谱仪研究了激光选区熔化粉末的粒径、物理特性、表面形貌、元素含量、微观组织在循环使用过程中的变化规律。研究结果表明:随着316L不锈钢粉末循环使用次数的增加,粉末的粒径分布、形貌、表面成分、表面微观组织和氧化程度都发生了较大变化;粉末的堆积特性如松装密度、振实密度、流动性也发生了不同程度的变化;另外,循环使用的粉末颗粒表面生成了富含硅、锰元素的圆形氧化斑点。本文将循环粉末中的异形颗粒分为两类——激光诱导熔池溅射颗粒和气体夹带诱导异形颗粒,并详细讨论了两类异形颗粒的形成机理。本文研究结果表明316L奥氏体不锈钢在循环使用过程中会产生弱磁性粉末颗粒。

引用

页码：92 / 104

页数：13

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