激光熔覆 WC-NiCrBSiFe 制造的仿生单元对 304 不锈钢高温耐腐蚀磨损性的影响

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
S. S. Miao, S. C. Sun, L. Wang, P. Zhang
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引用次数: 0

摘要

为提高 304 不锈钢的高温侵蚀耐磨性,本研究根据沙漠蝎身体表面的侵蚀耐磨特性,设计并制作了仿生样品。通过激光熔覆 25% WC-NiCrBSiFe 的方法,在 304 不锈钢表面制作了均匀分布的脊状仿生单元。实验使用自行设计的高温侵蚀磨损设备,比较了仿生和未处理样品从室温到 1000ºC 的侵蚀速率。结果表明,在不同温度下,仿生样品的侵蚀率明显低于未处理样品。仿生单元的侵蚀率从室温到 1000ºC 缓慢上升,在 400-600ºC 时呈下降趋势,在 1000ºC 时达到最大值,是未处理样品的 50%。仿生单元的磨损机理主要包括凿蚀、犁蚀和氧化膜以及硬质相的去除。随后提出了仿生单元改善高温侵蚀耐磨性的机理:(i) 软硬相交替分布的仿生单元独特的微观结构可减弱固体颗粒的冲击,硬相抵抗塑性变形,软相吸收冲击能量,阻碍裂纹扩展;(ii) 均匀分布的脊状单元可在高温侵蚀过程中产生气垫和屏蔽效应,从而减弱固体颗粒对仿生样品表面的凿削和犁耕作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Bionic Units Fabricated by WC-NiCrBSiFe Laser Cladding on High-Temperature Erosion Wear Resistance of 304 Stainless Steel

Effect of Bionic Units Fabricated by WC-NiCrBSiFe Laser Cladding on High-Temperature Erosion Wear Resistance of 304 Stainless Steel

To improve the high-temperature erosion wear resistance of 304 stainless steel, this study designed and fabricated bionic samples based on the erosion wear resistance characteristics of the desert scorpion body surface. Uniformly distributed ridged bionic units were fabricated on the surface of 304 stainless steel by laser cladding 25% WC-NiCrBSiFe. The experiments were conducted using self-designed high-temperature erosion wear equipment to compare the erosion rates of bionic and untreated samples from room temperature to 1000ºC. The results showed that the erosion rate of the bionic samples was significantly lower than that of the untreated sample at different temperatures. The erosion rate of bionic units slowly increased from room temperature to 1000ºC, showed a decreasing trend at 400–600ºC, and reached a maximum value at 1000ºC, which is 50% of the untreated sample. The bionic unit’s wear mechanism mainly includes chiseling, plowing, and removal of the oxide film, as well as hard phases. Subsequently, the mechanisms of the unit on high temperature erosion wear resistance improvement were suggested: (i) the unique microscopic structure of bionic units with alternating distribution of soft and hard phases can weaken the impact of solid particles, the hard phase resists the plastic deformation and the soft phase absorbs impact energy and hinders crack propagation;(ii) the uniformly distributed ridged units can generate air cushion and shielding effects during high temperature erosion, which can weaken the chiseling and plowing effects of solid particles on the surface of bionic samples.

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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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