Abstract
Pearlitic ductile irons (PDIs) are used in transportation and nuclear energy industries. In heavy loading situation, the service life of PDI is affected by numerous tribo aspects. In this study, surface of the PDI is alloyed with WC-12%Co powder using a high power fibre laser. The wear properties of the base material and laser alloying samples were investigated by tribometer with various parameters, i.e., temperature, load and sliding speed. Based on experimental test, the load has maximum percentage of contribution and followed by sliding speed and working temperature. The optimized tribological parameters by Grey relational analysis (GRA) were established and those values are closely matched with predicted values. Besides, base material and laser alloying surfaces were examined through Vickers hardness machine, scanning electron microscopy (SEM) and roughness tester. The laser altered specimen shows no defects and improves the wear properties than substrates. The identified optimal tribological parameters are load of 30 N, speed of 0.5 m/s and working temperature of 300 °C, and load of 30 N, speed of 0.5 m/s and working temperature of 200 °C for base metal and laser alloying samples, respectively.
摘要
珠光体球墨铸铁(PDIs)应用于运输和核能工业。在重载情况下, PDI的使用寿命受到多方面的 影响。在本研究中, 采用高功率光纤激光器使用WC-12%Co粉末对PDI表面进行合金化。在各种实 验参数下, 包括温度、载荷和滑动速度, 使用摩擦计研究了基材和激光合金化试样的磨损性能。实验 结果表明, 负载具有最大贡献百分比, 其次是滑动速度和工作温度。通过灰色关联分析(GRA)建立了 优化的摩擦学参数, 与预测值匹配。此外, 还通过维氏硬度机、扫描电镜(SEM)和粗糙度测试仪对基 材和激光合金表面进行了研究。激光处理没有使试样产生缺陷, 还改善了其磨损性能。母材和激光合 金化试样的最佳摩擦学参数分别为载荷30 N, 速度0.5 m/s及工作温度300 °C和载荷30N, 速度0.5 m/s 及工作温度200 °C.
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Abbreviations
- L :
-
Load
- SV:
-
Sliding velocity
- T :
-
Temperature
- GRA:
-
Grey relational analyses
- GRC:
-
Grey relational coefficient
- Lv:
-
Volume loss
- CoF:
-
Coefficient of friction
- R w :
-
Wear rate
- DF:
-
Degree of freedom
- SS:
-
Sum of squares
- V:
-
Variance
- P :
-
Percentage of contribution
- ANOVA:
-
Analysis of variance
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffraction
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The authors wish to thank National Taipei University of Technology, Taiwan, China for all support required to carry out this research.
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Jeyaprakash, N., Yang, Ch. & Tseng, Sp. Optimization of tribological parameters over WC-12%Co laser alloyed pearlitic ductile iron using Taguchi based Grey relational analysis. J. Cent. South Univ. 27, 736–751 (2020). https://doi.org/10.1007/s11771-020-4327-9
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DOI: https://doi.org/10.1007/s11771-020-4327-9
Keywords
- WC-12%Co
- laser alloying
- microstructure
- wear resistance
- Grey technique
- analysis of variance
- optimization
- roughness