CN111996414B - 一种用于3d打印的镍基高温合金及其粉末制备方法 - Google Patents
一种用于3d打印的镍基高温合金及其粉末制备方法 Download PDFInfo
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Abstract
本发明提供一种用于3D打印的镍基高温合金及其粉末制备方法,属于高温合金和增材制造技术领域。针对“不可焊”粉末镍基高温合金在3D打印过程中易开裂问题,本发明通过稀土微合金化,结合真空熔炼、脱气、精炼、合理参数的雾化、筛分工艺,制备出满足3D打印需求的镍基高温合金及其粉末。本发明显著降低了“不可焊”粉末镍基高温合金的开裂敏感性,扩宽了3D打印工艺窗口,打印出的制件无裂纹,力学性能优异;同时,本发明制备的粉末球形度高、流动性好、异形粉少,大幅提高了3D打印所需的粒径为15~53μm细粉和53~106μm中粒径粉末的收得率,满足高品质、低成本的镍基高温合金3D打印用粉末需求。
Description
技术领域
本发明提供一种用于3D打印的镍基高温合金及其粉末制备方法,属于高温合金和增材制造技术领域。
背景技术
金属3D打印技术的快速发展,对高品质、低成本金属粉末的需求日益增加。航空航天用高性能镍基高温合金3D打印技术的发展,受制于镍基高温合金的“可焊性”及其粉末的质量。目前用于3D打印的镍基高温合金主要是IN718、IN625等,它们具有良好的3D打印成形性能,但是其综合性能相较粉末镍基高温合金差。粉末镍基高温合金由于Al、Ti含量高,开裂敏感性大,在3D打印过程中容易产生裂纹,给粉末镍基高温合金的3D打印带来了极大的挑战。发展适用于3D打印的粉末镍基高温合金及其粉末制备技术,是镍基高温合金3D打印领域急需解决的问题。
现有粉末镍基高温合金的Al、Ti含量高,对开裂敏感,难以用于3D打印成形。适用于3D打印的粉末镍基高温合金,目前还没有相关报道。
粉末的流动性、杂质含量与成形缺陷密切相关。因此,3D打印技术对粉末的性能提出了更高要求,尤其是镍基高温合金。粉末的流动性直接影响选区激光熔融(SLM)、电子束熔化(EBM)过程中铺粉均匀性,以及同轴送粉激光成形(LENS)过程中的送粉稳定性,进而影响3D打印制件的质量。粉末的流动性受粉末粒径及粒径分布、粉末形状和所吸收的水分等多方面的影响。为了保证粉末的流动性,要求粉末是球形或近球形,粒径在十几微米到一百微米之间。3D打印镍基高温合金所用粉末,还存在成分均匀性差、氧含量高、球形度差、适合3D打印粒度分布的粉末收得率低等问题。
针对上述问题,国内外进行了探索性的研究。中国专利CN107716934A,公开了一种用于3D打印技术的Inconel718合金粉末的制备方法,采用真空感应熔炼技术和紧耦合气雾化技术,运用超声振动、气流分级方法对粉末进行粒度配比,制备得到适用于选区激光熔化技术的Inconel718合金粉末。中国专利CN105624472A公开了一种3D打印用镍基高温合金粉末及其制备方法,以重量百分比计,合金粉末的化学组成为,Ni50-80%,Al3-7%、Si≤1%、Ti1-6%、V0.1-1%、Cr2-10%、Mn≤1%、Fe1.68%、Co8-15%;其制备步骤为:按重量比称取原料,放入真空熔炼炉中熔炼为液体,然后将熔炼液体在过热度20~40℃下用高压氩气进行雾化,得到合金粉末,最后将合金粉末在氩气保护下进行高温退火处理后,进行振动筛分,冷却后分级真空包装,得到所述镍基高温合金粉末。中国专利CN107326218A公开了一种3D打印用DD5高温合金粉末的制备方法,对DD5母合金锭进行成分均匀化热处理,在惰性气体保护下,采用等离子旋转电极雾化法制备DD5合金粉末。以上专利主要采用制粉工艺,优化粉末的流动性、球形度以及降低粉末氧含量,来满足3D打印用粉末需求。中国专利(CN108941560B)公开了一种消除René104镍基高温合金激光增材制造裂纹的方法,提出通过设计激光成形参数和分区扫描策略,结合去应力退火和放电等离子烧结(SPS)处理,消除成形件内部裂纹的方案,并抑制了烧结过程中晶粒的长大。但是,对于“不可焊”镍基高温合金,在3D打印成形过程中易开裂、难成形,所制备的粉末难以满足高性能镍基高温合金制件3D打印需求。同时,目前还未见采用微合金化并结合制粉工艺,就能实现在3D打印过程中最大概率降低裂纹产生的相关记载。
本发明通过引入适量的稀土,进行稀土微合金化,大幅降低“不可焊”镍基高温合金3D打印开裂敏感性,得到适用于3D打印的高性能镍基高温合金;结合真空熔炼、脱气、精炼、雾化、筛分工艺,制备满足3D打印要求的镍基高温合金粉末。本发明显著降低气雾化粉末镍基高温合金粉末的氧、硫含量,提高粉末的球形度、流动性以及粒径为15~53μm细粉和53~106μm中粒径粉末的收得率,从而满足高性能镍基高温合金3D打印用粉末需求。
发明内容
本发明针对“不可焊”镍基高温合金3D打印易开裂问题,提供了一种用于3D打印的镍基高温合金及其粉末制备方法,其目的是大幅降低“不可焊”镍基高温合金3D打印开裂敏感性,得到适用于3D打印的高性能镍基高温合金;制备的粉末球形度好、氧硫含量低、粒径分布窄、松装密度高、流动性好、异形粉少,大幅提高15~53μm和53~106μm粒径粉末的收得率,同时显著降低“不可焊”镍基高温合金3D打印开裂敏感性,满足高性能镍基高温合金3D打印用粉末需求。本发明显著扩宽了镍基高温合金3D打印工艺窗口,降低了3D打印过程中由于不可控因素导致的产品性能急剧下降的风险,打印出了无裂纹且力学性能优异的制件。该制件经过后续热处理,其性能还会得到进一步提升。
本发明一种用于3D打印的镍基高温合金,所述用于3D打印的镍基高温合金以质量百分比计,包括下述组分:
Co:14-23%;
Cr:11-15%;
Al:2-5%;
Ti:3-6%;
Mo:2.7-5%;
W:0.5-3%;
Ta:0.5-4%;
Nb:0.25-3%;
Zr:0.02-0.06%;
B:0.01-0.05%;
C:0.0015-0.1%;
RE 0.05-0.18wt%;
余量为Ni;
或以其他不可焊镍基高温合金为基体,向基体中加入0.05-0.18wt%的RE;
所述其他不可焊镍基高温合金选自IN738LC、CM247LC、CMSX-4、René142、Hastelloy X中的一种;或以IN718、IN625镍基高温合金中的一种为基体,向基体中加入0.05-0.18wt%的RE。
本发明一种用于3D打印的镍基高温合金,所述用于3D打印的镍基高温合金以质量百分比计,包括下述组分:
Co:20.6%;
Cr:13%;
Al:3.4%;
Ti:3.9%;
Mo:3.8%;
W:2.1%;
Ta:2.4%;
Nb:0.9%;
Zr:0.05%;
B:0.03%;
C:0.04%;
RE 0.06-0.18%;进一步优选为0.07-0.09%;
余量为Ni。
本发明一种用于3D打印的镍基高温合金,RE选自Sc、Y、La、Ce、Er元素中的至少一种。
本发明一种用于3D打印的镍基高温合金,RE为Sc;或RE为Sc与Y、La、Ce、Er中至少一种的混合。在研发过程中发现,当稀土元素仅为Sc时,在同等加入量的情况下,其产品的收得率最高且质量也最好。
本发明一种用于3D打印镍基高温合金粉末的制备方法,所述制备方法包括下述步骤:
步骤一:真空熔炼
按设计组分配取原料,并将原料装入雾化制粉炉的坩埚内,在低于0.1Pa的真空度下采用感应加热,进行真空熔炼;
步骤二:脱气
原料熔化并完全合金化后,真空脱气10min~20min;
步骤三:精炼
向雾化制粉炉内充入高纯惰性气体至0.1-0.11MPa,将熔融的母合金熔液在1600℃~1650℃温度范围内保温10min~15min;
步骤四:雾化
将熔融的母合金熔液以3.5kg/min~5kg/min的流速经导流管流下,用3MPa~5MPa的高压、高纯惰性气体将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
步骤五:筛分
粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,筛网目数为100目及270目,得到中粉粒径为53~106μm,细粉粒径为15~53μm的球形镍基高温合金粉末,并进行真空封装;
所述的惰性气体应为氦气、氩气,或氩、氦混合气体,纯度为99.99wt%,其中氧含量小于0.0001wt%。
本发明一种用于3D打印镍基高温合金粉末的制备方法,所述原料中,含有Al-RE中间合金。
本发明一种用于3D打印镍基高温合金粉末的制备方法,粒径为53~106μm的中粉与粒径为15~53μm的细粉的总收得率为88.5%-91.5%。
本发明一种用于3D打印镍基高温合金粉末的制备方法,所得用于3D打印的镍基高温合金粉末的氧含量小于等于0.0126wt%,硫含量小于等于0.0056wt%。在工业上应用时,还可以采用等离子旋转电极雾化法制备镍基高温合金粉末。
经优化后,本发明一种用于3D打印镍基高温合金粉末的制备方法,所得用于3D打印的镍基高温合金粉末的氧含量小于等于0.01wt%,硫含量小于等于0.004wt%。
本发明一种用于3D打印镍基高温合金粉末的制备方法,所得用于3D打印的镍基高温合金粉末50g/2.5mm孔径的流动性为15-25s;经优化后可为15.5-16s。
本发明的优点和积极效果:
(1)本发明提出一种用于3D打印的镍基高温合金及其粉末制备方法,通过适量的稀土进行稀土微合金化,显著降低了René104镍基高温合金3D打印开裂敏感性。本发明所设计的粉末镍基高温合金,制备的粉末成分均匀,可以直接用于3D打印,且在打印成形过程中制件裂纹产生的概率远远低于现有镍基高温合金。
(2)本发明提出一种用于3D打印的镍基高温合金及其粉末制备方法,通过适量的稀土进行稀土微合金化,扩宽了镍基高温合金的3D打印工艺窗口,解决3D打印过程易开裂、难成形问题。
(3)本发明提出一种用于3D打印的镍基高温合金及其粉末制备方法,所制备的合金及其粉末,提高了3D打印制件的力学性能,抑制裂纹的形成和扩展。
(4)本发明提出一种用于3D打印的镍基高温合金及其粉末制备方法,向René104镍基高温合金中添加微量稀土元素,有效降低粉末的氧、硫含量,从而消除了3D打印过程中熔合不良甚至开裂现象。
(5)本发明提出一种用于3D打印的镍基高温合金及其粉末制备方法,通过向René104镍基高温合金中添适量稀土元素(尤其是往René104镍基高温合金引入0.07-0.09wt%稀土),在合适雾化工艺的协同下,制得的镍基高温合金粉末球形度好、氧硫含量低、径粒分布窄、松装密度高、流动性好、异形粉大幅减少,15~53μm和53~106μm粒度范围内粉末收得率大幅提高(最高可达91.5%),显著提高了3D打印用镍基高温合金粉末的性能,满足了镍基高温合金3D打印工艺的高标准要求。
附图说明
图1为实施例一所得添加微量稀土的René104合金粉末形貌扫描电镜(SEM)照片。
图2为实施例一所得添加微量稀土的René104合金粉末形貌高倍SEM照片。
图3为实施例一所得添加微量稀土的René104合金粉末的粒度分布曲线。
图4为实施例四制备的René104合金制件的微观结构SEM照片。
图5为对比例一所得未添加微量稀土元素的René104合金粉末形貌SEM照片。
图6为对比例一所得未添加微量稀土元素的René104合金粉末形貌高倍SEM照片。
图7为对比例一所得未添加微量稀土元素的René104合金粉末的粒度分布曲线。
具体实施方式
下面结合附图和具体实施例,对本发明做进一步的阐述。
实施例一:
将本发明方法用于下述René104镍基高温合金,添加质量分数为0.08%稀土元素,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.08Sc~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将添加质量分数为0.08%稀土Sc元素的René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中,采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4MPa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,得到球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;
图1是本发明实施例1采用气雾化法制备添加0.08%稀土元素的的René104镍基高温合金粉末颗粒SEM照片,异形粉和卫星粉较少,球形度高。
图2是本发明实施例1采用气雾化法制备添加0.08%稀土Sc元素的的René104镍基高温合金粉末颗粒高倍SEM照片,球形度高,粉末表面光滑。主要为树枝晶及少量胞状组织,且晶粒尺寸细小。
图3是本发明实施例1采用气雾化法制备添加0.08%稀土元素的的René104镍基高温合金粉末粒径分布图,粒径分布窄,15~53μm细粉和53~106μm中粒径粉末的总收得率达91.5%。
经分析,所制备添加0.08%稀土元素的René104镍基高温合金粉末氧含量为0.0093%,硫含量为0.0021%,50g/2.5mm孔径的流动性为15.8s。制备的粉末性能优异,能满足3D打印需求。
实施例二:
将本发明方法用于下述René104镍基高温合金,添加质量分数为0.08%稀土元素,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.08Y~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将添加质量分数为0.08%稀土Y元素的René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中,采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4MPa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;15~53μm细粉粒径和53~106μm中粉粒径粉末的总收得率为88.7%。
经分析,所制备添加0.08%稀土Y元素的René104镍基高温合金粉末氧含量为0.0126%,硫含量为0.0056%,50g/2.5mm孔径的流动性为24.3s。
实施例三:
将本发明方法用于下述René104镍基高温合金,添加质量分数为0.08%稀土元素,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.04Sc~0.04Y~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将添加质量分数为0.04%Sc和0.04%Y元素的René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中,采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4MPa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;15~53μm细粉粒径和53~106μm中粉粒径粉末的总收得率为90.2%。
经分析,所制备添加0.04%Sc和0.04%Y稀土元素的René104镍基高温合金粉末氧含量为0.0114%,硫含量为0.0048%,50g/2.5mm孔径的流动性为21.2s。
实施例四:
以实施例一制备的合金粉末为原料,采用中国专利(CN108941560B)对比例一的3D打印工艺参数制备René104合金块体。SLM工艺具体参数为:
激光功率为225W,光斑直径为0.12mm,扫描速度为600mm/s,扫描间距为0.11mm,铺粉层厚为0.03mm。(不采用分区策略)
图4为实施例四制备的René104合金的微观结构SEM照片,成形件结构致密,没有观察到裂纹。
经检测,所制备的René104合金的致密度为99.2%,室温屈服强度为913MPa,抗拉强度为1247MPa,伸长率为13.3%;与中国专利(CN108941560B)对比例一经过SPS消除裂纹处理的制件相比,屈服强度和抗拉强度分别提高21.6%和38.4%。
本发明制备的合金及粉末,采用中国专利(CN108941560B)中开裂最严重、制件性能最差的3D打印工艺参数,制备出了无裂纹制件,且力学性能优异;表明本发明制备的合金及粉末可扩宽3D打印工艺窗口。
对比例一:
将本发明方法用于下述René104镍基高温合金,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4Mpa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;
图5是本发明实施例1采用气雾化法制备未添加微量稀土元素的René104镍基高温合金粉末颗粒SEM照片,可以观察到较多异形粉和卫星粉。
图6是本发明实施例1采用气雾化法制备未添加微量稀土元素的René104镍基高温合金粉末颗粒高倍SEM照片,粉末表面有卫星粉附着。
图7是本发明实施例1采用气雾化法制备未添加微量稀土元素的René104镍基高温合金粉末粒径分布图,粒径分布相比实施例1较宽,15~53μm细粉粒径和53~106μm中粉粒径粉末的总收得率仅为74.1%。
经分析,所制备的René104镍基高温合金粉末氧含量为0.017%,硫含量为0.0067%,2.5mm孔径下没有流动性。制备的粉末性能差,不能满足3D打印需求。
对比例二:
将本发明方法用于下述René104镍基高温合金,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.04Sc~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将添加质量分数为0.04%稀土Sc元素的René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4Mpa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;15~53μm细粉粒径和53~106μm中粉粒径粉末的总收得率仅为80.6%。
经分析,所制备添加0.04%Sc稀土元素的René104镍基高温合金粉末氧含量为0.0144%,硫含量为0.0073%,50g/2.5mm孔径的流动性为40.5s。添加的稀土元素过少时,粉末的流动性较差,不利于3D打印成形。
对比例三:
将本发明方法用于下述René104镍基高温合金,该合金重量百分比为:20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.20Sc~余量为Ni。采用本发明技术方案制备3D打印用镍基高温合金粉末的步骤如下:
(1)真空熔炼:将添加质量分数为0.20%稀土Sc元素的René104镍基高温合金原料装入雾化制粉炉的坩埚内,在0.05Pa真空气氛中采用中频电源感应进行加热熔炼;
(2)脱气:原料熔化并完全合金化后,真空脱气15min;
(3)精炼:向炉内充入高纯氩气至0.1MPa,氩气纯度为99.99wt%,氩气中氧含量为0.00006wt%,将熔融的金属液在1650℃保温15min;
(4)雾化:将金属液以3.8kg/min的重量流率经导流管流下,采用4Mpa的高压、高纯氩气将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
(5)筛分:粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到细粉粒径为15~53μm,中粉粒径为53~106μm的球形镍基高温合金粉末,并进行真空封装;15~53μm细粉粒径和53~106μm中粉粒径粉末的总收得率仅为82%。
经分析,所制备添加0.20%Sc稀土元素的René104镍基高温合金粉末氧含量为0.0087%,硫含量为0.0018%,50g/2.5mm孔径的流动性为17.4s。在熔炼制粉过程中,添加过量的稀土元素不会进一步提高粉末的性能;反而会增加成本,同时提高15μm以下的粉末比率,降低了满足3D打印所需粒径粉末的收得率。
Claims (9)
1.一种用于3D打印的镍基高温合金,其特征在于:用于3D打印的镍基高温合金以质量百分比计,包括下述组分:
Co:14-23%;
Cr:11-15%;
Al:2-5%;
Ti:3-6%;
Mo:2.7-5%;
W:0.5-3%;
Ta:0.5-4%;
Nb:0.25-3%;
Zr:0.02-0.06%;
B:0.01-0.05%;
C:0.0015-0.1%;
RE 0.05-0.18wt%;
余量为Ni;
或以其他不可焊镍基高温合金为基体,向基体中加入0.05-0.18wt%的RE;
所述其他不可焊镍基高温合金选自IN738LC、CM247LC、CMSX-4、René 142、Hastelloy X中的一种;或以IN718、IN625镍基高温合金中的一种为基体,向基体中加入0.05-0.18wt%的RE;
所述粉末通过下述步骤制备:
步骤一:真空熔炼
按设计组分配取原料,并将原料装入雾化制粉炉的坩埚内,在低于0.1Pa的真空度下采用感应加热,进行真空熔炼;
步骤二:脱气
原料熔化并完全合金化后,真空脱气10min~20min;
步骤三:精炼
向雾化制粉炉内充入高纯惰性气体至0.1-0.11MPa,将熔融的母合金熔液在1600℃~1650℃温度范围内保温10min~15min;
步骤四:雾化
将熔融的母合金熔液以3.5kg/min~5kg/min的流速经导流管流下,用3MPa~5MPa的高压、高纯惰性气体将金属液流破碎成细小液滴,液滴经过冷却和凝固,形成球形粉末,进入粉末收集罐中;
步骤五:筛分
粉末经充分冷却后,在惰性气体保护下使用气流分级和超声震动筛分,得到中粉粒径为53~106μm,细粉粒径为15~53μm的球形镍基高温合金粉末,并进行真空封装;
所述的惰性气体应为氦气、氩气,或氩、氦混合气体,纯度为99.99wt%,其中氧含量小于0.0001wt%。
2.根据权利要求1所述的一种用于3D打印的镍基高温合金,其特征在于:用于3D打印的镍基高温合金以质量百分比计,包括下述组分:
Co: 20.6%;
Cr: 13%;
Al: 3.4%;
Ti: 3.9%;
Mo: 3.8%;
W: 2.1%;
Ta: 2.4%;
Nb: 0.9%;
Zr: 0.05%;
B: 0.03%;
C: 0.04%;
RE 0.06-0.18wt%;
余量为Ni。
3.根据权利要求1所述的一种用于3D打印的镍基高温合金,其特征在于:RE选自Sc、Y、La、Ce、Er元素中的至少一种。
4.根据权利要求3所述的一种用于3D打印的镍基高温合金,其特征在于:RE为Sc;或RE为Sc与Y、La、Ce、Er中至少一种的混合。
5.根据权利要求1所述的一种3D打印镍基高温合金,其特征在于:所述原料中,含有Al-RE中间合金。
6.根据权利要求1所述的一种3D打印镍基高温合金,其特征在于:粒径为53~106μm的中粉与粒径为15~53μm的细粉的总收得率为88.5%~91.5%。
7.根据权利要求1所述的一种3D打印镍基高温合金,其特征在于:所得用于3D打印的镍基高温合金粉末的氧含量小于等于0.0126wt%,硫含量小于等于0.0056wt%。
8.根据权利要求7所述的一种3D打印镍基高温合金,其特征在于:所得用于3D打印的镍基高温合金粉末的氧含量小于等于0.01wt%,硫含量小于等于0.004wt%。
9.根据权利要求1所述的一种3D打印镍基高温合金,其特征在于:所得用于3D打印的镍基高温合金粉末50g/2.5mm孔径的流动性为15-25 s。
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