Medyński Daniel, Chęcmanowski Jacek
Faculty of Technical and Economic Sciences, Witelon Collegium State University, Sejmowa 5A, 59-220 Legnica, Poland.
Department of Advanced Material Technologies, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.
Materials (Basel). 2022 Jun 9;15(12):4090. doi: 10.3390/ma15124090.
The aim of the study was to determine the effect of zone reinforcement of cast steel L120G13 with AlO macro-particles on the corrosion resistance of the composite obtained in this way. The obtained results allow us to conclude that strengthening of cast steel with corundum, the aim of which was to significantly increase the abrasive wear resistance, did not significantly deteriorate corrosion resistance. SEM tests show that a permanent diffusion layer interface is formed at the boundary between cast steel and corundum. In this area, simple manganese segregation and reverse iron and chromium segregation were found. These elements pass from the liquid alloy to the surface layer of the corundum particles, causing the aluminium and oxygen to be pushed deep into the corundum grains. Corrosion tests indicate comparable corrosion resistance of cast steel L120G13 and the composite L120G13 + AlO. Moreover, no intergranular corrosion was found in the matrix of the composite and no signs of pitting corrosion were found in the areas of the interface between the phases of the composite. This information is extremely important from the point of view of the material's service life. Observations of breakthrough of both materials obtained during fracture after potentiodynamic corrosion tests, immediately after freezing in liquid nitrogen, indicate cracking with plastic features and increased resistance to dynamic forces of cast steel L120G13 and the composite L120G13 + AlO.
本研究的目的是确定用氧化铝宏观颗粒对铸钢L120G13进行区域强化对由此获得的复合材料耐腐蚀性的影响。所得结果使我们能够得出结论，用刚玉强化铸钢，其目的是显著提高耐磨粒磨损性能，但并没有显著降低耐腐蚀性。扫描电子显微镜测试表明，在铸钢和刚玉之间的边界处形成了一个永久性扩散层界面。在该区域，发现了简单的锰偏析以及铁和铬的反向偏析。这些元素从液态合金转移到刚玉颗粒的表层，导致铝和氧被深入推到刚玉晶粒内部。腐蚀试验表明，铸钢L120G13和复合材料L120G13 + AlO具有相当的耐腐蚀性。此外，在复合材料的基体中未发现晶间腐蚀，在复合材料各相之间的界面区域也未发现点蚀迹象。从材料使用寿命的角度来看，这一信息极为重要。在动电位腐蚀试验后，将两种材料在液氮中冷冻后进行断裂观察，结果表明，铸钢L120G13和复合材料L120G13 + AlO均出现具有塑性特征的开裂，且对动态力的抵抗力增强。
