Effect of deposition sequence on microstructure and mechanical properties of 18Ni300 – Ni20 fabricated using laser-directed energy deposition

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-24 DOI:10.1016/j.matchar.2025.115068

Junxin Zhou , Min Fang , Guangyu Wu , Gang Xu , Haifei Lu , Kaiyu Luo , Igor V. Alexandrov , Jinzhong Lu

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Abstract

In this work, laser-direct energy deposition was employed to fabricate 18Ni300Ni20 laminated heterostructures. The microstructures of two different components (the 18Ni300/Ni20 component: depositing Ni20 on 18Ni300, and the Ni20/18Ni300 component: depositing Ni20 on 18Ni300) were analyzed using OM, SEM, and EBSD techniques. The distribution of microhardness and tensile characteristics was examined to assess the interfacial bonding strength. The microhardness of 18Ni300 at the Ni20/18Ni300 component reaches 430.49 HV, which is significantly higher than that of the 18Ni300/Ni20 component at 261.33 HV. This is attributed to the prolonged high temperatures resulting in the transformation of martensite to austenite, which is less hard than martensite. Ni20 exhibited a stable microhardness of 351.12 HV at the interfaces. The 18Ni300/Ni20 component demonstrated a superior ultimate tensile strength of 757 MPa compared to the Ni20/18Ni300 component, which exhibited a strength of 256 MPa. This is ascribed to a confluence of three factors: the combination of different crystal structures; interlocking structures at interfaces; and extensive diffusion of elements. The results of this study inform 3D printing, control of organization, and mechanical properties of martensitic FeNi alloy components.

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沉积顺序对激光定向能沉积18Ni300 - Ni20显微组织和力学性能的影响

本文采用激光直接能量沉积法制备了18Ni300Ni20层状异质结构。采用OM、SEM和EBSD技术分析了两种不同组分（18Ni300/Ni20组分：在18Ni300上沉积Ni20和Ni20/18Ni300组分：在18Ni300上沉积Ni20）的显微组织。通过显微硬度分布和拉伸特性的测试来评估界面结合强度。18Ni300在Ni20/18Ni300组分处的显微硬度达到430.49 HV，明显高于18Ni300/Ni20组分的261.33 HV。这是由于长时间的高温导致马氏体向奥氏体转变，而奥氏体的硬度低于马氏体。界面处Ni20的显微硬度稳定在351.12 HV。与Ni20/18Ni300的极限拉伸强度256 MPa相比，18Ni300/Ni20的极限拉伸强度为757 MPa。这是三个因素共同作用的结果：不同晶体结构的结合；界面上的联锁结构；元素的广泛扩散。这项研究的结果为马氏体FeNi合金部件的3D打印、组织控制和机械性能提供了信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.