CN108746615B - 一种提高激光增材制造钛合金层间结合性能的方法 - Google Patents
一种提高激光增材制造钛合金层间结合性能的方法 Download PDFInfo
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Abstract
本发明公开了一种提高激光增材制造钛合金层间结合性能的方法。首先将基材预热至300℃,对激光增材制造工艺窗口优化,对激光沉积过程中沉积层中部熔池的定点温度变化记录,获得熔池中心的定点热循环曲线,提取出峰值温度T及液相线与温度曲线的截距t,并对液相线以上温度曲线部分对时间积分I;根据T≥1.4Tm,t≥0.8s,I≥0.45TL/V原则对工艺参数进行优化,获得的优化工艺窗口:激光功率为600~900W,扫描速度为6~10mm/s,送粉量为8‑14g/min,光斑直径为1~2mm;高度方向增量Z为0.2~0.3毫米/层;获得无层间缺陷的钛合金成形件。本发明能有效提高钛合金成形件的层间结合性能。
Description
技术领域
本发明涉及激光金属材料加工领域,尤其涉及一种提高激光增材制造钛合金层间结合性能的方法。
背景技术
激光增材制造,也称“激光增材制造”,是一种将激光熔覆技术与快速原型技术相结合的先进制造技术。该技术以高能激光束为热源,以送粉/丝或铺粉为材料供给方式,通过分层加工、逐层累加的方式实现三维实体零件的快速成形,有效地缩短生产周期与降低零件加工成本。此外,激光增材制造也能实现磨损零件的快速修复。
激光增材制造钛合金是采用移动式激光热源将材料快速加热熔化,并随着激光热源的远离而快速凝固,进而形成熔覆层,再通过逐道搭接、逐层叠加实现三维零件的成形。钛合金由于具有比强度高、生物相容性好及抗腐蚀等特点被广泛应用于航空航天及生物医疗等领域。由于激光增材制造独特的逐层累加方式,激光增材制造钛合金具有以下特征:1)周期性的层带效应;2)显微组织不均匀;3)层间界面易产生缺陷;4)较弱的层间结合性能及低的塑性。然而,上述特征对成形件的机械性能非常不利。因此,有必要对其进行有效调控,尤其是避免层间未熔合缺陷,提高成形件的层间结合能力。
国内外学者针对3D打印钛合金层间界面行为进行了相关的研究工作。Dinda等人报道,激光增材制造试样中存在周期性的层带结构,且相邻层带之间的间距与层抬升量相当,层带处组织与其它部位组织具有明显差异。Liu等人发现层间界面使工件的显微组织及硬度变得不均匀。Wen等人报道,层间界面对加载状态下微观滑移、宏观塑性行为及断裂模式具有重要的影响,层间界面的存在是工件明显各向异性及低塑性的主要原因。目前,现有报道主要通过调节工艺参数或外加温度场以改变熔池状态进而提高层间界面结合能力。如,Gu等人发现低的扫描速度、高的激光功率及高的线能量密度有利于减少层间未熔合缺陷,进而提升成形件层间结合性能。Yang等人发现,熔池模式对层间缺陷及力学性能具有重要的作用。与热传导模式相比,小孔模式能获得更好的层间界面及更高的界面结合能力,进而获得更高的强度与塑性。此外,也有文献报道对基材进行预热,能够有效减少层与层之间的未熔合缺陷,提高钛合金零件层间结合能力。
上述研究为激光增材制造钛合金的工艺-层间界面-力学性能关系等提供了很好的见解及调控方法。然而,由于激光增材制造过程中的物理过程极其复杂、影响参数众多,想要获得无层间缺陷、组织性能优异的钛合金成形零件尚存在一定挑战。此外,激光增材制造具有系统依赖性,采用相同优化的工艺参数在其它的激光增材制造系统很难重复获得想要的结果。目前,尚缺乏一种通用的方法能够对激光增材制造钛合金层间界面进行有效调控。
发明内容
本发明的目的是提供一种提高激光增材制造钛合金层间结合性能的方法。
一种提高激光增材制造钛合金层间结合性能的方法,包括以下步骤:
步骤一:首先,采用电磁感应加热设备将基材预热至300℃,再对激光增材制造工艺窗口进行优化,获得如下初步优化参数:激光功率为400~1000W,扫描速度为4~12mm/s,送粉量为6-18g/min,光斑直径为1~2mm;高度方向增量Z为0.15~0.3毫米/层;
步骤二:采用比色高温计对激光沉积过程中沉积层中部熔池的定点温度变化进行记录,获得熔池中心的定点热循环曲线,提取出峰值温度T及液相线与温度曲线的截距t,t表示熔池寿命,并对液相线以上温度曲线部分做时间的积分,得到温度对时间的积分强度I;
步骤三:根据T≥1.4Tm,t≥0.8s,I≥0.45TL/V原则对工艺参数进行优化,其中Tm为钛合金的熔点,L为熔池的长度,V为扫描速度;
步骤四:获得的优化工艺窗口如下:激光功率为600~900W,扫描速度为6~10mm/s,送粉量为8-14g/min,光斑直径为1~2mm;高度方向增量Z为0.2~0.3毫米/层;
步骤五:最后,按上述工艺参数及方法进行钛合金激光增材制造,获得无层间缺陷的钛合金成形件。
在步骤二中,比色高温计发射率设置为1.1,温度测量范围为600-3300℃,光斑尺寸为0.8mm,单个数据采集时间为1ms。
所述钛合金包括α钛合金、α+β钛合金及β钛合金。
本发明通过熔池温度场模拟与凝固理论,根据T≥1.4Tm,t≥0.8s,I≥TL/V原则对工艺参数进行优化,获得的优化工艺窗口如下:激光功率P为400-600W;扫描速度V为4-6mm/s;送粉量F为6-10g/min;光斑直径D为1-3mm;高度方向增量Z为0.3毫米/层;最后,按上述工艺参数及方法进行钛合金激光增材制造,获得无层间缺陷的钛合金成形件,获得的特征指标,能有效提高钛合金成形件的层间结合性能。
附图说明
图1为现有方法得到的钛合金3D打印试样金相图;
图2为本发明得到的钛合金3D打印试样金相图。
具体实施方式
实施例1
步骤一:首先,采用电磁感应加热设备将基材预热至300℃,再对激光增材制造工艺窗口进行优化,获得如下初步优化参数:激光功率为400~1000W,扫描速度为4~12mm/s,送粉量为6-18g/min,光斑直径为1~2mm;高度方向增量Z为0.15~0.3毫米/层;
步骤二:采用比色高温计对激光沉积过程中沉积层中部熔池的定点温度变化进行记录,获得熔池中心的定点热循环曲线,提取出峰值温度T及液相线与温度曲线的截距t,t表示熔池寿命,并对液相线以上温度曲线部分做时间的积分,得到温度对时间的积分强度I;比色高温计发射率设置为1.1,温度测量范围为600-3300℃,光斑尺寸为0.8mm,单个数据采集时间为1ms。
步骤三:根据T≥1.4Tm,t≥0.8s,I≥0.45TL/V原则对工艺参数进行优化,其中Tm为钛合金的熔点,L为熔池的长度,V为扫描速度;
步骤四:获得的优化工艺窗口如下:激光功率为600~900W,扫描速度为6~10mm/s,送粉量为8-14g/min,光斑直径为1~2mm;高度方向增量Z为0.2~0.3毫米/层;
步骤五:最后,按上述工艺参数及方法进行钛合金激光增材制造,获得无层间缺陷的钛合金成形件。
图1为采用已有方法所获得的钛合金3D打印试样金相图。试样具有逐层制造特征,平均层间距约为0.6mm(如图1(a)所示)。此外,层与层之间界面处存在明显的未融合缺陷,如图1(a)与(b)所示。此类未融合缺陷的产生主要与下列原因有关:1)钛合金在增材制造过程中表面极易氧化,在沉积层表面生成难熔的氧化钛;2)在较低能量密度下,激光很难将生成的氧化膜全部熔化;3)熔池没有足够的能量与时间对已沉积层进行有效稀释。上述结果表明,在本专利方法外,很难消除层间未熔合缺陷。
图2为采用本发明实施例1所获得的钛合金3D打印试样金相图。图2(a)为试样界面的整体形貌。宏观上试样具有典型的带状结构,整体颜色较深,组织难以分辨。图2(b)及(c)为试样左端区域的低倍与高倍金相图。从中可以看出,层与层之间为冶金结合,并没有发现未熔合及气孔等缺陷。与层带上方组织相比,层带下方由较粗的网篮组织组成。采用本专利提出方法不仅对熔池的能量输入、峰值温度及熔池寿命(即熔池存活时间)进行严格的控制,确保熔池与已沉积层有足够的时间及能量进行反应,进而消除层间界面缺陷,提高层间冶金结合能力。上述结果表明,采用本专利方法可以有效地对层间界面缺陷进行有效调控。
Claims (3)
1.一种提高激光增材制造钛合金层间结合性能的方法,其特征在于包括以下步骤:
步骤一:首先,采用电磁感应加热设备将基材预热至300℃,再对激光增材制造工艺窗口进行优化,获得如下初步优化参数:激光功率为400~1000W,扫描速度为4~12mm/s,送粉量为6-18g/min,光斑直径为1~2mm;高度方向增量Z为0.15~0.3毫米/层;
步骤二:采用比色高温计对激光沉积过程中沉积层中部熔池的定点温度变化进行记录,获得熔池中心的定点热循环曲线,提取出峰值温度T及液相线与温度曲线的截距t,t表示熔池寿命,并对液相线以上温度曲线部分做时间的积分,得到温度对时间的积分强度I;
步骤三:根据T≥1.4Tm,t≥0.8s,I≥0.45TL/V原则对工艺参数进行优化,其中Tm为钛合金的熔点,L为熔池纵截面的长度,V为扫描速度;
步骤四:获得的优化工艺窗口如下:激光功率为600~900W,扫描速度为6~10mm/s,送粉量为8-14g/min,光斑直径为1~2mm;高度方向增量Z为0.2~0.3毫米/层;
步骤五:最后,按上述工艺参数及方法进行钛合金激光增材制造,获得无层间缺陷的钛合金成形件。
2.根据权利要求1所述的一种提高激光增材制造钛合金层间结合性能的方法,其特征在于:在步骤二中,比色高温计发射率设置为1.1,温度测量范围为600-3300℃,光斑尺寸为0.8mm,单个数据采集时间为1ms。
3.根据权利要求1所述的一种提高激光增材制造钛合金层间结合性能的方法,其特征在于:所述钛合金包括α钛合金、α+β钛合金及β钛合金。
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