Krella Alicja K, Zakrzewska Dominika E, Buszko Marta H, Marchewicz Artur
Institute of Fluid Flow Machinery PAS, Fiszera 14, 80-231 Gdańsk, Poland.
Materials (Basel). 2021 Mar 16;14(6):1456. doi: 10.3390/ma14061456.
S235JR steel is used in many applications, but its resistance to the erosion processes has been poorly studied. To investigate this resistance, cavitation, and slurry erosion tests were conducted. These tests were carried out at different erosion intensities, i.e., different flow rates in the cavitation tunnel with a system of barricades and different rotational speeds in the slurry pot. The steel was tested as-received and after thermal treatment at 930 °C, which lowered the hardness of the steel. To better understand the degradation processes, in addition to mass loss measurements, surface roughness and hardness were measured. Along with increasing erosion intensity, the mass loss increased as well. However, the nature of the increase in mass loss, as well as the effect of steel hardness on this mass loss, was different for each of the erosion processes. In the cavitation erosion tests, the mass loss increased linearly with the increase in flow velocity, while in the slurry tests this relationship was polynomial, indicating a strong increase in mass losses with an increase in rotational speed. Cavitation erosion resulted in stronger and deeper strain hardening than slurry. Surface damage from cavitation erosion tests was mainly deep pits, voids, and cracks during the slurry tests, while flaking was the most significant damage.
S235JR钢在许多应用中都有使用，但其对侵蚀过程的抗性研究较少。为了研究这种抗性，进行了空蚀和泥浆冲蚀试验。这些试验在不同的侵蚀强度下进行，即在带有障碍物系统的空蚀试验段中采用不同的流速，以及在泥浆罐中采用不同的转速。对钢材进行了原始状态以及在930℃热处理后的测试，热处理降低了钢材的硬度。为了更好地理解降解过程，除了测量质量损失外，还测量了表面粗糙度和硬度。随着侵蚀强度的增加，质量损失也增加。然而，每种侵蚀过程中质量损失增加的性质以及钢材硬度对这种质量损失的影响是不同的。在空蚀试验中，质量损失随流速增加呈线性增加，而在泥浆试验中这种关系是多项式的，表明随着转速增加质量损失大幅增加。空蚀导致的应变硬化比泥浆冲蚀更强且更深。空蚀试验造成的表面损伤主要是深坑、孔洞和裂纹，而在泥浆试验中剥落是最显著的损伤。
