CN108500265A - 一种6061铝合金激光增材制造工艺 - Google Patents
一种6061铝合金激光增材制造工艺 Download PDFInfo
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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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6061铝合金激光增材制造工艺,在大大提高6061铝合金强度的同时并不降低塑性。本发明采用激光将6061铝合金粉末融化,凝固,之后立即进行低温惰性气体处理,以产生大量位错缺陷、进而增大强度。
Description
技术领域
本发明涉及增材制造技术领域,尤其涉及一种6061铝合金的增材制造工艺。
背景技术
6061铝合金具有密度小、比强度高、导热、耐腐蚀等优异性能,是航空航天领域常用的一种轻质结构材料。然而,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6061铝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6061铝合金。
本发明的技术方案如下 :
本发明提供了一种6061铝合金的增材制造工艺,包括如下步骤:
(1)将6061铝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30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500~800W;所述6061铝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140~220℃再进行空冷。
有益的效果:
在本发明中,采用激光扫描后,6061铝合金粉末融化,凝固,之后立即进行低温惰性气体处理,可以产生大量缺陷,尤其是产生高密度位错网络,大大增强6061铝合金的强度;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不降低塑性。同时,采用本发明的方案可以制造形状复杂的零件,发挥增材制造的特长。
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6061铝合金原料粉末进行铺粉,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500W,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30摄氏度的氩气冷却;
(4)进行去应力退火处理:加热到140℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到6061铝合金样品。
对制备的6061铝合金进行拉伸测试,抗拉强度为523Mpa,延伸率为11%。
实施例2
(1)将6061铝合金原料粉末进行铺粉,形成粉末层,铺粉的厚度优选为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800W,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220℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到6061铝合金样品。
对制备的6061铝合金进行拉伸测试,抗拉强度为511Mpa,延伸率为10%。
实施例3
(1)将6061铝合金原料粉末进行铺粉,形成粉末层,铺粉的厚度为39μm;
(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650W,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170℃再进行空冷;
(5)重复步骤(1)-(4)10次,得到6061铝合金样品。
对制备的6061铝合金进行拉伸测试,抗拉强度为541Mpa,延伸率为10%。
对比:常规锻造、退火得到的6061铝合金的抗拉强度为310Mpa,延伸率为11%;可以看出,本发明的技术方案大大提高了6061铝合金的抗拉强度,同时塑性没有受到明显损失。
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6061铝合金增材制造工艺,其特征在于:该工艺采用激光将6061铝合金粉末融化、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6061铝合金增材制造工艺,其特征在于:该工艺包含如下步骤:
(1)将6061铝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30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6061铝合金增材制造工艺,其特征在于:激光扫描的功率为500~8000W。
4.一种如权利要求2所述的6061铝合金增材制造工艺,其特征在于:6061铝合金原料粉末的粒度为5~10μm。
5.一种如权利要求2所述的6061铝合金增材制造工艺,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6061铝合金增材制造工艺,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6061铝合金增材制造工艺,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6061铝合金增材制造工艺,其特征在于:激光扫描的扫描间距为0.1~0.2mm。
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Citations (5)
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CN102328081A (zh) * | 2011-09-26 | 2012-01-25 | 华中科技大学 | 一种高功率激光快速成形三维金属零件的方法 |
CN104759625A (zh) * | 2015-03-27 | 2015-07-08 | 桂林电子科技大学 | 一种使用激光3d打印技术制备铝合金结构件的材料及方法 |
CN105215359A (zh) * | 2015-10-08 | 2016-01-06 | 湖南顶立科技有限公司 | 一种高压惰性气体保护下金属粉末增材制造方法 |
US20160001364A1 (en) * | 2013-03-13 | 2016-01-07 | United Technologies Corporation | Uninteruppted filtering system for selective laser melting powder bed additive manufacturing process |
CN107470629A (zh) * | 2017-08-30 | 2017-12-15 | 湖南顶立科技有限公司 | 一种增材构件热处理工艺 |
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Patent Citations (5)
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CN102328081A (zh) * | 2011-09-26 | 2012-01-25 | 华中科技大学 | 一种高功率激光快速成形三维金属零件的方法 |
US20160001364A1 (en) * | 2013-03-13 | 2016-01-07 | United Technologies Corporation | Uninteruppted filtering system for selective laser melting powder bed additive manufacturing process |
CN104759625A (zh) * | 2015-03-27 | 2015-07-08 | 桂林电子科技大学 | 一种使用激光3d打印技术制备铝合金结构件的材料及方法 |
CN105215359A (zh) * | 2015-10-08 | 2016-01-06 | 湖南顶立科技有限公司 | 一种高压惰性气体保护下金属粉末增材制造方法 |
CN107470629A (zh) * | 2017-08-30 | 2017-12-15 | 湖南顶立科技有限公司 | 一种增材构件热处理工艺 |
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