打印参数对电子束增材制造<strong>Ti-Ni</strong>合金性能的影响

doi:10.11900/0412.1961.2019.00410

金属学报

2020, Vol. 56

Issue (8): 1103-1112 DOI: 10.11900/0412.1961.2019.00410

本期目录 | 过刊浏览

打印参数对电子束增材制造Ti-Ni合金性能的影响

任德春¹^,², 张慧博¹, 赵晓东³, 王福雨⁴, 侯文韬¹, 王绍钢¹, 李述军¹, 金伟¹(

), 杨锐¹

1 中国科学院金属研究所沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016
3 东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室沈阳 110819
4 中国航空工业集团公司沈阳飞机设计研究所沈阳 110035

Influence of Manufacturing Parameters on the Properties of Electron Beam Melted Ti-Ni Alloy

REN Dechun¹^,², ZHANG Huibo¹, ZHAO Xiaodong³, WANG Fuyu⁴, HOU Wentao¹, WANG Shaogang¹, LI Shujun¹, JIN Wei¹(

), YANG Rui¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3 Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
4 AVIC Shenyang Aircraft Design and Research Institute, Shenyang 110035, China

引用本文:

任德春, 张慧博, 赵晓东, 王福雨, 侯文韬, 王绍钢, 李述军, 金伟, 杨锐. 打印参数对电子束增材制造Ti-Ni合金性能的影响[J]. 金属学报, 2020, 56(8): 1103-1112.
Dechun REN, Huibo ZHANG, Xiaodong ZHAO, Fuyu WANG, Wentao HOU, Shaogang WANG, Shujun LI, Wei JIN, Rui YANG. Influence of Manufacturing Parameters on the Properties of Electron Beam Melted Ti-Ni Alloy[J]. Acta Metall Sin, 2020, 56(8): 1103-1112.

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摘要:

利用SEM、XRD、DSC、TEM和等轴压缩等实验手段，研究和分析了打印参数焦距补偿(FO)和速度函数(SF)对电子束增材制造(EBM)制备的Ti-Ni合金显微组织、相组成、相变行为以及压缩性能的影响。结果表明：EBM打印参数FO和SF在一定范围内调节时均可制备出相对密度较高(97%以上)的Ti-Ni合金样品。由于EBM电子束的功率大，在预合金粉末快速受热熔化过程中，Ni元素的挥发效应大于富Ti相Ti₂Ni析出效应对相变温度的影响，使得制备Ti-Ni块体的相变温度大于相应的预合金粉末，而打印参数FO和SF对制备样品的相变温度、相组成以及显微硬度的影响较小。EBM制备过程中在样品内部引入不同种类的缺陷类型，使得Ti-Ni合金样品在相对密度接近的情况下压缩性能表现出极大的差异，其中贯穿型裂纹缺陷对压缩性能的影响最大，使Ti-Ni合金的强度和塑性大幅度降低。

关键词 ：电子束增材制造, Ti-Ni合金, 制备参数, 显微组织, 压缩性能

Abstract：

Electron beam melting (EBM) is one of the additive manufacturing technologies which can be used to fabricate the complex structure and shape samples. Until now, there are few literatures published about the properties of Ti-Ni samples produced by EBM. In this work, the influence of two important manufacturing parameters of focus offset (FO) and speed function (SF) on the density, phase content and transformation behavior, microstructure and mechanical properties was investigated for the equiatomic Ti-Ni shape memory alloy fabricated by EBM used DSC, XRD, SEM, TEM and electronic universal testing machine. The results showed that all the Ti-Ni samples had a high relative density beyond than 97% for fabricated by different combinations of FO and SF in the selected range. The corresponding phase transformation temperatures for all the Ti-Ni samples fabricated by EBM were higher than the pre-alloyed Ti-Ni powder, due to the effect of evaporation of Ni element higher than that of the formation of Ni-rich Ti₂Ni phase during the quickly melting and solidification process. On the other hand, the EBM manufacturing parameters of FO and SF had limited influence on the phase contents, phase transformation temperatures and Vickers hardness. Due to the feature of the EBM fabricating method, the different types of defects would be introduced in the Ti-Ni solid samples. Though all the samples had similar high relative density, the performance of the compression behavior were shown great difference, and the crack defect had the larger effect than the gas and lack-of fusion porosities on the compression fracture stress and strain.

Key words： electron beam melting Ti-Ni alloy manufacturing parameter microstructure compression property

收稿日期: 2019-11-29

ZTFLH:

TG146.23

基金资助:中国科学院战略性先导科技专项(A类)项目(XDA22010103)

作者简介: 任德春，男，1991年生，博士生

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	任德春
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	侯文韬
	王绍钢
	李述军
	金伟
	杨锐
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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00410 或 https://www.ams.org.cn/CN/Y2020/V56/I8/1103

表1 电子束增材制造(EBM)制备Ti-Ni合金具体参数

图1 电子束增材制造(EBM)用Ti-Ni预合金粉末形貌的SEM像

图2 不同EBM打印参数制备的Ti-Ni合金样品的实测密度和相对密度

图3 Ti-Ni预合金粉末和不同EBM打印参数制备的Ti-Ni合金样品的XRD谱

图4 Ti-Ni预合金粉末和EBM制备Ti-Ni合金样品的DSC曲线

表2 Ti-Ni预合金粉末和EBM 制备Ti-Ni合金样品的相变温度 (℃)

图5 EBM制备Ti-Ni合金样品的室温压缩应力-应变曲线

图6 EBM制备不同Ti-Ni合金样品的显微硬度及样品S5沿打印方向平面和打印平面上表面的显微硬度

图7 EBM制备不同Ti-Ni合金样品的显微组织

图8 EBM制备Ti-Ni合金样品S5的表面形貌、显微组织和EDS分析

图9 EBM制备Ti-Ni合金样品S5显微组织的TEM 像和SAED谱

图10 EBM 制备Ti-Ni合金样品的缺陷分析

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