Microstructure and Properties of 304 Stainless Steel Coating with Different Thickness on Aluminum Alloy Surface

被引：0
|
作者：
Cheng B. [1 ]
Zhang X.-Y. [1 ]
Li W.-S. [1 ,2 ]
Li X.-Q. [1 ]
Zhang T. [1 ]
Belotserkovsky M. [3 ]
Seniuts U. [3 ]
Zhornik V. [3 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, School of Materials Science and Engineering, Lanzhou University of Technology, Gansu, Lanzhou
[2] College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou
[3] Joint Institute of Mechanical Research, Belarusian National Academy of Sciences, Minsk
来源：
Surface Technology | 2023年 / 52卷 / 11期
基金：
中国国家自然科学基金;
关键词：
3-point bending; 304 stainless steel coating; aluminum alloy; HVOF; residual stress; tribology property;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.11.017
中图分类号：
学科分类号：
摘要：
304 stainless steel coatings with different thickness (≈200 µm, ≈600 µm, ≈1 000 µm) were successfully deposited on the surface of aluminum alloy by High Velocity Oxygen-fuel (HVOF) spraying technology to improve the surface properties. Meanwhile, the effect of the coating thickness on the service performance was evaluated. The microstructure, phase composition residual stress, micro-hardness distribution, elastic modulus, bonding strength, bending strength and tribology properties of each 304 stainless steel coating were studied. Then the relationship between microstructure, mechanical and tribology properties of coatings with different thickness was systematically discussed. The results showed that the microstructure of each coating was uniform and crack-free, and it was well combined with the aluminum alloy substrate. The XRD patterns showed that each coating was mainly composed of austenite phases, the rest were a small number of ferrite phases and oxides, which were caused by temperature change. At the same time, the austenite grains in the coating were refined significantly compared with those in the original powder. It was caused by the plastic deformation of un-melted particles and the rapid cooling of molten particles. Porosity (C200≈0.5%, C600≈2.5%, C1 000≈4.3%) and oxygen content (C200≈2.4%, C600≈ 3.1%, C1 000≈4.2%) increased with the increase of coating thickness. The comprehensive residual stress in each coating was compressive stress by curvature method, and decreased with the increase of the coating thickness, which was beneficial for various properties of the coating. In terms of mechanical properties, the micro-hardness and elastic modulus were obviously higher than that of the substrate, but they all decreased with the increase of coating thickness. And the bonding strength of the coating also decreased from C200/50.4 MPa to C600/43.6 MPa and C1 000/39.6 MPa. Moreover, the fracture stiffness of the coating was positively correlated with the thickness of the coating, which was related to the increase of fracture energy with the increase of coating thickness. In all coatings, the crack initiation and propagation occurred through un-melted particles and the area of oxide accumulation when the coating was fractured, so that the amount and location of un-melted particles and oxides in the coating was the most important characteristic in their fracture behaviors. In the end, under dry friction conditions, the friction coefficient of the 304 stainless steel coating was about 0.6, the friction process was more stable and the wear resistance was up to 3 times that of the aluminum alloy substrate (5.53×10–4 mmN–1m–1). The wear rate of C200 (1.48×10–4 mmN–1m–1) was significantly lower than that of C600 (1.88×10–4 mmN–1m–1) and C1 000 (2.08×10–4 mmN–1m–1). Therefore, with the increase of coating thickness, the stability of coating friction coefficient decreased, the wear mark deepened, and the wear rate increased. The wear mechanism was mainly fatigue wear and furrow wear. In addition, it was accompanied by oxidation wear, in which Fe2O3 produced in the friction process aggravated the wear process of 304 stainless steel coating. Overall, grain refinement, residual compressive stress and oxide increase the micro-hardness of the coating. However, with the increase of coating thickness, the increase of defects and the decrease of residual compressive stress reduce the overall performance of the coating. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：225 / 236
页数：11
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