通过埋弧焊对热连轧机立辊上的镍钼合金硬面涂层的高温磨损行为进行研究

Hikmet Gizem Sarsılmaz, A. Günen, E. Kanca
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摘要

本研究采用埋弧焊(SAW)方法,对钢铁行业热轧工段常用的 AISI 4140 钢制热连轧立辊进行了 ER430 和 E430+EC410NiMo 涂层处理。通过扫描电子显微镜(SEM)、能量色散光谱(EDS)、显微硬度和磨损测试(室温 24 ℃、300 ℃ 和 600 ℃)对涂层进行了表征。XRD 分析表明,在 ER430 样品中,主要相为 α-铁素体相,并观察到少量 γ(奥氏体)相;而在 ER430+EC410NiMo 样品中,α-铁素体相为主要相,但结构中的γ(奥氏体)相更为严重,另外还形成了 M6C 碳化物相。ER430 和 ER430+EC410NiMo 涂层的厚度和显微硬度值分别为 1.5 mm 和 3.75 mm,硬度值分别为 533±42 HV0.1 和 473±35 HV0.1。与未涂层试样相比,涂层试样表面硬度的增加使其在所有条件下都具有更高的耐磨性。在平均摩擦系数值方面,涂层试样的值普遍较低,但在某些情况下,平均摩擦系数较高。在磨损试验中,300°C 下进行的试验中磨损体积损失最小,而 600°C 下进行的试验中磨损体积损失最大。对磨损机理进行评估后发现,涂层试样的磨损机理一般以粘着磨损和氧化磨损为主。在较高温度下,氧化磨损机制变得更加突出。与 ER430 相比,ER430+EC410NiMo 涂层表现出更好的耐磨性,这可归因于这些涂层中的γ(奥氏体)和 M6C 相的韧性效应。因此,可以得出结论,在 AISI 4140 钢制热连轧机立辊上涂敷粉末沉积涂层可以提高其耐磨性,从而提高生产过程中的生产率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of high-temperature wear behavior of Ni-Mo alloyed hardfacing coatings applied on hot strip mill vertical rolls by submerged arc welding
In this study, hot strip mill vertical rolls made of AISI 4140 steel, commonly used in the iron and steel industry's hot rolling section, were coated with ER430 and E430+EC410NiMo using the submerged arc welding (SAW) method. The coatings were characterized through scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness, and wear testing (room 24 °C, 300 °C, and 600 °C). XRD analysis showed that in the ER430 sample, the dominant phase was α-ferrite phase and a small amount of γ (austenite) phase observed, while in the ER 430+EC410NiMo sample, the α-ferrite phase was the dominant phase, but the γ (austenite) phase in the structure was more severe and additionally M6C carbide phase was formed. Coating thicknesses and microhardness values of ER430 and ER430+EC410NiMo coatings were measured as 1.5 mm and 3.75 mm thicknesses, and 533±42 HV0.1 and 473±35 HV0.1 respectively. The increase in hardness on the surface of coated specimens resulted in higher wear resistance compared to the uncoated specimens under all conditions. Regarding average friction coefficient values, coated specimens generally exhibited lower values, although in some cases, the average friction coefficient was higher. In the wear tests, the lowest wear volume losses occurred in the tests conducted at 300°C, while the highest wear volume losses were observed in the tests at 600°C. Upon evaluating the wear mechanisms, it was determined that adhesive and oxidative wear mechanisms were generally dominant in the coated specimens. At higher temperatures, oxidative wear mechanisms became more prominent. ER430+EC410NiMo coatings exhibited better wear resistance compared to ER430, which can be attributed to the toughness effect of γ (austenite) and M6C phases in these coatings. Consequently, it was concluded that applying powder deposition coatings onto hot strip mill vertical rolls made of AISI 4140 steel could enhance their wear resistance, thereby increasing productivity in manufacturing processes.
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