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The Effect of Heat Treatment on the Performance of Antiwear Steel Coatings Deposited on AISI 1015 Steel Substrates
Tribology Transactions ( IF 2.1 ) Pub Date : 2021-11-29 , DOI: 10.1080/10402004.2021.1898067
Sandro C. Silva 1, 2 , Luiz L. Silva 3 , Marcelo A. Câmara 2 , Paulo César M. Rodrigues 2 , Alexandre M. Abrão 2
Affiliation  

Abstract

The critical components of mining equipment generally work in relative motion and in an abrasive environment. Under these circumstances, wear by friction represents the largest portion of the cost associated with failure and maintenance of sliding bearings. Thus, antiwear coatings are extensively applied aimed at returning such equipment to its initial condition. Tamping machines are a typical type of equipment working in this condition and the focus of the present research work, whose goal is to investigate the performance of conjugates made of an MnSi low-alloy steel coating deposited on an AISI 1015 low-carbon steel substrate and subjected to three distinct heat treatment routes (normalizing and deep and surface hardening). Coating deposition was performed using gas metal arc welding. The performance assessment is based on microhardness and residual stress distributions, friction coefficient, wear mechanisms, and wear rate. The results indicate that ferritic and pearlitic microstructures were obtained after normalizing, whereas deep and surface hardening produced lath martensite. Consequently, the value of surface microhardness of the coating was 176 HV after normalizing, 356 HV after deep hardening, and 466 HV after surface hardening. Normalizing induced shallower compressive residual stresses of lower intensity, whereas surface hardening induced compressive residual stresses of higher intensity to reach deeper beneath the coating surface. More refined grains (martensite laths) were associated with higher microhardness values and compressive residual stresses of higher intensity, thus suggesting that this condition leads to higher wear resistance. The normalized conjugate presented the lowest friction coefficient and the highest wear rate, and the hardened coatings presented similar behaviors with regard to wear resistance.



中文翻译:

热处理对沉积在 AISI 1015 钢基材上的抗磨钢涂层性能的影响

摘要

采矿设备的关键部件通常在相对运动和磨蚀环境中工作。在这些情况下,摩擦磨损代表了与滑动轴承故障和维护相关的成本的最大部分。因此,抗磨涂层被广泛应用,旨在将此类设备恢复到其初始状态。捣固机是在这种条件下工作的典型设备类型,也是当前研究工作的重点,其目标是研究由沉积在 AISI 1015 低碳钢基材上的 MnSi 低合金钢涂层制成的共轭物的性能,以及经过三种不同的热处理路线(正火和深度和表面硬化)。使用气体保护金属电弧焊进行涂层沉积。性能评估基于显微硬度和残余应力分布、摩擦系数、磨损机制和磨损率。结果表明,正火后得到铁素体和珠光体显微组织,而深部和表面硬化产生板条马氏体。因此,涂层的表面显微硬度值正火后为176 HV,深淬后为356 HV,表面硬化后为466 HV。正火导致较低强度的较浅的压缩残余应力,而表面硬化导致较高强度的压缩残余应力到达涂层表面下方的更深处。更细的晶粒(马氏体板条)与更高的显微硬度值和更高强度的压缩残余应力相关,因此表明这种情况会导致更高的耐磨性。归一化共轭具有最低的摩擦系数和最高的磨损率,而硬化涂层在耐磨性方面表现出相似的行为。

更新日期:2022-01-20
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