Razaq Abdul, Yu Peng, Khan Adnan Raza, Ji Xiao-Yuan, Yin Ya-Jun, Zhou Jian-Xin, Shehabeldeen Taher A
State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
Department of Engineering, University of Technology and Applied Sciences, Muscat 133, Oman.
Materials (Basel). 2024 May 20;17(10):2468. doi: 10.3390/ma17102468.
The improved wear and corrosion resistance of gray cast iron (GCI) with enhanced mechanical properties is a proven stepping stone towards the longevity of its versatile industrial applications. In this article, we have tailored the microstructural properties of GCI by alloying it with titanium (Ti) and tungsten (W) additives, which resulted in improved mechanical, wear, and corrosion resistance. The results also show the nucleation of the B-, D-, and E-type graphite flakes with the A-type graphite flake in the alloyed GCI microstructure. Additionally, the alloyed microstructure demonstrated that the ratio of the pearlite volume percentage to the ferrite volume percentage was improved from 67/33 to 87/13, whereas a reduction in the maximum graphite length and average grain size from 356 ± 31 µm to 297 ± 16 µm and 378 ± 18 µm to 349 ± 19 µm was detected. Consequently, it improved the mechanical properties and wear and corrosion resistance of alloyed GCI. A significant improvement in Brinell hardness, yield strength, and tensile strength of the modified microstructure from 213 ± 7 BHN to 272 ± 8 BHN, 260 ± 3 MPa to 310 ± 2 MPa, and 346 ± 12 MPa to 375 ± 7 MPa was achieved, respectively. The substantial reduction in the wear rate of alloyed GCI from 8.49 × 10 mm/N.m to 1.59 × 10 mm/N.m resulted in the upgradation of the surface roughness quality from 297.625 nm to 192.553 nm. Due to the increase in the corrosion potential from -0.5832 V to -0.4813 V, the impedance of the alloyed GCI was increased from 1545 Ohm·cm to 2290 Ohm·cm. On the basis of the achieved experimental results, it is suggested that the reliability of alloyed GCI based on experimentally validated microstructural compositions can be ensured during the operation of plants and components in a severe wear and corrosive environment. It can be predicted that the proposed alloyed GCI components are capable of preventing the premature failure of high-tech components susceptible to a wear and corrosion environment.
灰铸铁（GCI）耐磨性和耐腐蚀性的提高以及机械性能的增强，是其在广泛工业应用中实现长期使用的一个已被证实的重要因素。在本文中，我们通过添加钛（Ti）和钨（W）对GCI的微观结构特性进行了调整，从而提高了其机械性能、耐磨性和耐腐蚀性。结果还表明，在合金化GCI微观结构中，除了A型石墨片外，还出现了B型、D型和E型石墨片的形核。此外，合金化微观结构表明，珠光体体积百分比与铁素体体积百分比的比例从67/33提高到了87/13，同时最大石墨长度和平均晶粒尺寸分别从356±31微米减小到297±16微米，从378±18微米减小到349±19微米。因此，它改善了合金化GCI的机械性能、耐磨性和耐腐蚀性。改性微观结构的布氏硬度、屈服强度和抗拉强度分别从213±7布氏硬度显著提高到272±8布氏硬度、从260±3兆帕提高到310±2兆帕、从346±12兆帕提高到375±7兆帕。合金化GCI的磨损率从8.49×10毫米/牛·米大幅降低到1.59×10毫米/牛·米，表面粗糙度质量从297.625纳米提升到192.553纳米。由于腐蚀电位从-0.5832伏增加到-0.4813伏，合金化GCI的阻抗从1545欧姆·厘米增加到2290欧姆·厘米。基于所取得的实验结果，建议在恶劣磨损和腐蚀环境下的工厂和部件运行过程中，可以确保基于经过实验验证的微观结构组成的合金化GCI的可靠性。可以预测，所提出的合金化GCI部件能够防止易受磨损和腐蚀环境影响的高科技部件过早失效。
