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粉末冶金材料科学与工程 >

2026 , Vol. 31 >Issue 1: 86 - 97

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2025058

工艺技术

激光粉末床熔融NiTi合金成形参数优化及点阵结构电解抛光

  • 赵军哲 ,
  • 杨蕊 ,
  • 王敏卜 ,
  • 柴雨晴 ,
  • 彭越 ,
  • 郑聃
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  • 1.湖南科技大学 材料科学与工程学院,湘潭 411201;
    2.中南大学 粉末冶金全国重点实验室,长沙 410083;
    3.中核建中核燃料元件有限公司,宜宾 644000
王敏卜,讲师,博士。电话：15273152564;E-mail: wangminbo@hnust.edu.cn;郑聃,博士。电话：15116333749;E-mail: csuzhd@csu.edu.cn

收稿日期: 2025-07-16

  修回日期: 2025-12-07

  网络出版日期: 2026-03-10

基金资助

湖南省大学生创新训练项目(S2024105340104)

收起

Forming parameter optimization and electrolytic polishing of lattice structures in laser powder bed fusion NiTi alloy

  • ZHAO Junzhe ,
  • YANG Rui ,
  • WANG Minbo ,
  • CHAI Yuqing ,
  • PENG Yue ,
  • ZHENG Dan
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  • 1. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
    2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
    3. CNNC Jianzhong Nuclear Fuel Co., Ltd, Yibin 644000, China

Received date: 2025-07-16

  Revised date: 2025-12-07

  Online published: 2026-03-10

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摘要

NiTi合金因形状记忆效应、超弹性及优异的生物相容性,广泛应用于航空航天和生物医疗领域。本文采用激光粉末床熔融技术制备Ni50.95Ti合金,系统研究激光功率与扫描速度对冶金缺陷及显微硬度的影响,并分析最佳工艺条件下扫描面与建造面的显微组织特征,以及电解抛光对点阵节点表面形貌的调控效果。结果表明：较低扫描速度(450、550 mm/s)下合金易产生裂纹,较高扫描速度(650~850 mm/s)能显著提高合金致密度,但能量密度超过110 J/mm3会加剧气孔形成。最优参数(135 W、650 mm/s)下,合金由B2奥氏体和B19′马氏体组成,呈现〈100〉//BD与〈110〉//BD织构且无裂纹。电解抛光3 min可有效去除未熔粉末并获得光滑无蚀坑表面,为NiTi合金点阵在生物医疗领域的应用提供了工艺支撑。

关键词： NiTi合金; 激光粉末床熔融; 冶金缺陷; 微观组织; 电解抛光

本文引用格式

赵军哲 , 杨蕊 , 王敏卜 , 柴雨晴 , 彭越 , 郑聃 . 激光粉末床熔融NiTi合金成形参数优化及点阵结构电解抛光[J]. 粉末冶金材料科学与工程, 2026 , 31(1) : 86 -97 . DOI: 10.19976/j.cnki.43-1448/TF.2025058

Abstract

NiTi alloys, known for their shape memory effect, superelasticity, and excellent biocompatibility, are widely used in aerospace and biomedical fields. In this study, Ni50.95Ti alloys were fabricated via laser powder bed fusion to systematically investigate the effects of laser power and scanning speed on metallurgical defects and microhardness. The microstructural features of the scan and build surfaces under optimal processing conditions were characterized, and the regulation effect of electrolytic polishing on the surface morphology of lattice nodes was evaluated. Results show that low scanning speeds (450, 550 mm/s) tend to induce cracks, while higher scanning speeds (650~850 mm/s) significantly improve densification, however, energy densities above 110 J/mm3 promote pore formation. Under optimal parameters (135 W, 650 mm/s), the alloys consisted of B2 austenite and B19′ martensite exhibit〈100〉//BD and〈110〉//BD textures, and are crack-free. Electrolytic polishing for 3 min effectively remove unmelted powders, produce a smooth and pit-free surface, providing process support for the application of lattice-structured NiTi alloys in biomedical field.

Key words： NiTi alloy; laser powder bed fusion; metallurgical defect; microstructure; electrolytic polishing

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