扫描速度对激光直接沉积 70Cr8Ni2Y 涂层微观结构演变和性能的影响

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-09-17 DOI:10.1088/2053-1591/ad78af

Xueting Chen, Chang Zhao, Xiaoou Zhu, Guili Yin and Yun Xu

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引用次数: 0

摘要

通过不同扫描速度的直接激光沉积（DLD）制备了 70Cr8Ni2Y 涂层。研究了涂层的微观结构演变以及微观结构与性能之间的关系。结果表明，DLD 70Cr8Ni2Y 涂层的显微组织为马氏体，相为 α′（Fe-Cr）和 γ-Fe（Fe-Ni）。随着扫描速度的增加，马氏体尺寸从 5.42 ± 0.04 μm 减小到 4.42 ± 0.01 μm 和 3.20 ± 0.02 μm。当扫描速度为 20 mm s-1 时，制作的涂层显示出最高的平均显微硬度（883 ± 37 HV）和最低的无气孔质量磨损率（0.061 mg mm-1）。细晶粒强化和固溶强化的综合强化效果以及良好的成型性是涂层具有高硬度和耐磨性的根本原因。该研究结果可为具有高硬度和耐磨性的 DLD 合金涂层提供实验依据。

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Effect of scanning speeds on microstructure evolution and properties of 70Cr8Ni2Y coatings by direct laser deposition

The 70Cr8Ni2Y coatings were prepared by direct laser deposition (DLD) with different scanning speeds. The microstructure evolution and the relationship between microstructure and properties of the coatings were studied. The results demonstrated that the microstructure of DLD 70Cr8Ni2Y coatings was martensite, and the phases were α′ (Fe-Cr) and γ-Fe (Fe-Ni). With the increased of scanning speed, the martensite size decreased from 5.42 ± 0.04 μm to 4.42 ± 0.01 μm and 3.20 ± 0.02 μm. When the scanning speed was 20 mm s−1, the fabricated coating displayed the highest average microhardness (883 ± 37 HV) and the lowest mass wear rate (0.061 mg mm−1) without pores. The combined strengthening effect of fine grain strengthening and solid solution strengthening, as well as good formability, were the fundamental reasons for the high hardness and wear resistance of the coating. The results of this study can provide an experimental basis for the DLD alloy coatings with high hardness and wear resistance.

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.