Study on cavitation erosion and slurry erosion resistance of martensitic precipitation hardening stainless steel coatings fabricated by high power laser cladding

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL Wear Pub Date : 2024-09-05 DOI:10.1016/j.wear.2024.205562

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Abstract

The present study systematically compared the cavitation erosion (CE) and slurry erosion (SE) resistance of 0Cr12Ni9A and 0Cr17Ni4Cu4Nb coatings fabricated by high power laser cladding (HPLC) and the differences in CE and SE resistance were revealed by combining microstructure and mechanical properties. The experimental results indicated that the build rate of HPLC reached 256 mm³/s, which was much higher than that achieved by traditional low power laser cladding (154 mm³/s). Furthermore, the hardness (50 HRC), ultimate tensile strength (1370 MPa), yield strength (1349 MPa) and break elongation (11.5 %) of 0Cr12Ni9A coating were 1.11 times, 1.12 times, 1.25 times and 0.59 times that of 0Cr17Ni4Cu4Nb coating, respectively. The CE and SE resistance of the 0Cr12Ni9A coating were 9.51 times, 0.63 times (attack angle $α$ = 45°) and 1.23 times (90°) than that of the 0Cr17Ni4Cu4Nb coating and 22.87 times, 1.32 times (45°), 1.91 times (90°) than that of the 0Cr13Ni5Mo substrate, respectively. The cladding layers with high hardness and strength exhibits enhanced CE and SE (90°) resistance due to the higher resistance to plastic deformation and failure when facing the vertical impact of cavitation bubble collapse or sand particles. However, the SE resistance (45°) is related to the unit volume fracture energy, with a higher value indicating more effective absorption of kinetic energy from impacting sand particles, resulting in reduced flaky peeling off for improved SE resistance. The high build rate of HPLC and the exceptional CE and SE resistance of 0Cr12Ni9A coating material provide a novel solution to extend the service life of Pelton turbines.

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高功率激光熔覆马氏体沉淀硬化不锈钢涂层抗气蚀和浆液侵蚀性能研究

本研究系统比较了高功率激光熔覆（HPLC）工艺制作的 0Cr12Ni9A 和 0Cr17Ni4Cu4Nb 涂层的抗空化侵蚀（CE）和抗浆液侵蚀（SE）性能，并结合微观结构和机械性能揭示了其抗 CE 和 SE 性能的差异。实验结果表明，HPLC 的堆积速率达到 256 mm3/s，远高于传统低功率激光熔覆的堆积速率（154 mm3/s）。此外，0Cr12Ni9A 涂层的硬度（50 HRC）、极限拉伸强度（1370 兆帕）、屈服强度（1349 兆帕）和断裂伸长率（11.5%）分别是 0Cr17Ni4Cu4Nb 涂层的 1.11 倍、1.12 倍、1.25 倍和 0.59 倍。0Cr12Ni9A 涂层的抗 CE 和 SE 能力分别是 0Cr17Ni4Cu4Nb 涂层的 9.51 倍、0.63 倍（攻角 α = 45°）和 1.23 倍（90°），是 0Cr13Ni5Mo 基体的 22.87 倍、1.32 倍（45°）和 1.91 倍（90°）。高硬度和高强度的覆层具有更强的抗 CE 和 SE（90°）能力，这是因为在面对空化气泡坍塌或沙粒的垂直冲击时，覆层具有更强的抗塑性变形和失效能力。不过，抗 SE（45°）能力与单位体积断裂能有关，数值越高，表明越能有效吸收冲击砂粒的动能，从而减少片状剥落，提高抗 SE 能力。HPLC 的高形成率和 0Cr12Ni9A 涂层材料优异的抗 CE 和 SE 性能为延长 Pelton 涡轮机的使用寿命提供了一种新的解决方案。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.