CN108356267A - 一种镁合金增材制造工艺 - Google Patents
一种镁合金增材制造工艺 Download PDFInfo
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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Abstract
本发明公开了一种镁合金的增材制造工艺。采用激光将镁合金粉末融化、凝固,之后立即进行低温惰性气体处理,可以产生大量位错缺陷,在大大提高镁合金强度的同时塑性不会明显降低。
Description
技术领域
本发明涉及增材制造技术领域,尤其涉及一种镁合金的增材制造工艺。
背景技术
镁合金具有密度低、比强度高、导热、导电、耐腐蚀等性能,是航空航天领域常用的一种轻质结构材料。镁合金塑性差,传统加工技术难以实现变截面、内部复杂流道、精密薄壁件等复杂构件的制造,而这些对于增材制造技术却很容易实现。
发明内容
发明目的:本发明的目的在于提供一种高强度镁合金的激光增材制造工艺,本发明提供的工艺能够获得质量优异的镁合金。
本发明的技术方案如下 :
本发明提供了一种镁合金的增材制造工艺,包括如下步骤:
(1)将镁合金原料粉末进行铺粉,形成粉末层;
(2)在惰性气体保护下,对粉末层进行激光扫描,进行增材制造;
(3)采用低于零下20摄氏度的惰性气体冷却;
(4)进行去应力退火处理;
(5)重复步骤(1)-(4)。
作为优选,所述激光扫描的功率优选为200~400W;所述镁合金原料粉末的粒度优选为5~10μm;所述激光扫描过程中的光斑直径优选为50~100μm,所述铺粉的厚度优选为30~50μm。激光扫描的速度优选为8000~10000mm/s,激光扫描的扫描间距优选为0.1~0.2mm,所述去应力退火处理的方式有选为:加热到140~160℃再进行空冷。
有益的效果:
在本发明中,采用激光扫描后,镁合金粉末熔化、凝固,之后立即进行低温惰性气体处理,可以产生大量缺陷,尤其是产生高密度位错网络,大大增强镁合金的强度;这种网络同时还可以允许位错通过,这样在强度增高的同时塑性不会恶化。同时,采用本发明的方案可以制造形状复杂的零件。
为了便于理解本发明,下面提供实施例用于解释本发明,但它们不构成对本发明的限定。
具体实施方式
下面通过结合实施例详细描述本发明。
实施例1
(1)将ZM2镁合金粉末进行铺粉,形成粉末层,铺粉的厚度为50μm;
(2)在氩体保护下,对粉末层进行激光扫描,进行增材制造;其中,激光功率为400W,激光扫描过程中的光斑直径优选为100μm,激光扫描的速度优选为9000mm/s,激光扫描的扫描间距优选为0.1mm;
(3)采用零下20摄氏度的氩气冷却;
(4)进行去应力退火处理:加热到100℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到镁合金样品。
对制备的镁合金进行拉伸测试,抗拉强度为370Mpa,延伸率为2%。
实施例2
(1)将ZM2镁合金粉末进行铺粉,形成粉末层,铺粉的厚度为30μm;
(2)在氩体保护下,对粉末层进行激光扫描,进行增材制造;其中,激光功率为200W,激光扫描过程中的光斑直径优选为50μm,激光扫描的速度优选为10000mm/s,激光扫描的扫描间距优选为0.17mm;
(3)采用零下50摄氏度的氩气冷却;
(4)进行去应力退火处理:加热到160℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到镁合金样品。
对制备的镁合金进行拉伸测试,抗拉强度为357Mpa,延伸率为2%。
实施例3
(1)将ZM6镁合金粉末进行铺粉,形成粉末层,铺粉的厚度为32μm;
(2)在氩体保护下,对粉末层进行激光扫描,进行增材制造;其中,激光功率为320W,激光扫描过程中的光斑直径优选为70μm,激光扫描的速度优选为8000mm/s,激光扫描的扫描间距优选为0.2mm;
(3)采用零下40摄氏度的氩气冷却;
(4)进行去应力退火处理:加热到150℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到镁合金样品。
对制备的镁合金进行拉伸测试,抗拉强度为392Mpa,延伸率为3%。
按照国标的常规制造方法,ZM2铸造镁合金的抗拉强度为205Mpa,延伸率为2%;ZM6镁合金的抗拉强度为230Mpa,延伸率为3%。可以看出,本发明的技术方案大大提高了镁合金的抗拉强度,同时塑性没有受到损失。
以上所述仅是本发明实施方式的一些例子,应当指出:对于本技术领域的技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (8)
1.一种镁合金增材制造工艺,其特征在于:该工艺采用激光将镁合金粉末融化、凝固,之后进行低温惰性气体处理。
2.一种如权利要求1所述的镁合金增材制造工艺,其特征在于:该工艺包含如下步骤:
(1)将镁合金原料粉末进行铺粉,形成粉末层;
(2)在惰性气体保护下,对粉末层进行激光扫描,进行增材制造;
(3)采用低于零下20摄氏度的惰性气体冷却;
(4)进行去应力退火处理;
(5)重复步骤(1)-(4)。
3.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:激光扫描的功率为200~400W。
4.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:镁合金原料粉末的粒度为5~10μm。
5.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:激光扫描的光斑直径为50~100μm。
6.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:铺粉的厚度为30~50μm。
7.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:激光扫描的速度为8000~10000mm/s。
8.一种如权利要求2所述的镁合金增材制造工艺,其特征在于:激光扫描的扫描间距为0.1~0.2mm。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109530678A (zh) * | 2018-12-28 | 2019-03-29 | 西安铂力特增材技术股份有限公司 | 一种用于高性能镁合金零件制造的方法 |
CN111360258A (zh) * | 2020-05-08 | 2020-07-03 | 浙江华科三维科技有限公司 | 一种利用3d打印制备镁合金零件的方法 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109530678A (zh) * | 2018-12-28 | 2019-03-29 | 西安铂力特增材技术股份有限公司 | 一种用于高性能镁合金零件制造的方法 |
CN111360258A (zh) * | 2020-05-08 | 2020-07-03 | 浙江华科三维科技有限公司 | 一种利用3d打印制备镁合金零件的方法 |
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Application publication date: 20180803 |