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首页> 外文期刊>Journal of Materials Engineering and Performance >Surface Modification by Friction Stir Processing of Low-Carbon Steel: Microstructure Investigation and Wear Performance
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Surface Modification by Friction Stir Processing of Low-Carbon Steel: Microstructure Investigation and Wear Performance

机译：低碳钢搅拌加工表面改性：微观结构调查和磨损性能

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摘要

A low-carbon steel sheet with a thickness of 5 mm was subjected to friction stir processing (FSP) by one to four different passes. The microstructures of different regions were characterized using the optical microscopy and electron backscatter diffraction. The Vickers micro-harness was measured at the distance of 200 mu m below the processed surfaces. The influence of pass numbers (PNs) on wear resistance was studied in terms of coefficients of friction (CoFs), weight losses and wear rates. SEM topographies of the worn surfaces were also studied to evaluate the wear mechanisms. Microstructure observations showed that Widmanstatten ferrite plates were formed in stir zones (SZs) and heat affected zones. As PN increased, these grains were widened due to the increment of the carbon diffusivity and lengthened because of the high heat input and microstructure anisotropy. Besides, increasing the PN causes increasing of the hardness and wear resistance, simultaneously. Specifically, the wear rate in the SZ was reduced from 2.8 x 10(-2) mm(3) m(-1) in base metal to 0.3 x 10(-2) mm(3) m(-1) in sample which was subjected to 4 FSP passes. However, variation in PN had no considerable effect on CoFs. Oxidative wear mechanism was observed on the worn surface of the steel and the FSPed samples while more debris was formed by increasing the PNs.
机译：对厚度为5mm的低碳钢板进行了一到四次搅拌摩擦加工（FSP）。利用光学显微镜和电子背散射衍射对不同区域的微观结构进行了表征。维氏微线束在加工表面下方200μm处进行测量。从摩擦系数（CoFs）、重量损失和磨损率等方面研究了孔型数（PNs）对耐磨性的影响。还研究了磨损表面的SEM形貌，以评估磨损机理。微观结构观察表明，魏氏铁素体板在搅拌区（SZs）和热影响区形成。随着PN的增加，由于碳扩散率的增加，这些晶粒变宽，由于高热量输入和微观结构的各向异性，这些晶粒变长。此外，增加PN会同时提高硬度和耐磨性。具体而言，SZ中的磨损率从母材中的2.8 x 10（-2）mm（3）m（-1）降低到经过4次FSP的样品中的0.3 x 10（-2）mm（3）m（-1）。然而，PN的变化对CoFs没有显著影响。在钢和FSPed试样的磨损表面上观察到氧化磨损机制，同时通过增加PNs形成更多碎屑。

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