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http://dx.doi.org/10.5762/KAIS.2020.21.3.576

Effect of Nickel Content on Corrosion Resistance and Machinability of Fe-23Cr-2.5C-1.2Si-1.08Mn-0.48Mo-0.3V-xNi Cast Iron  

Kim, Ki-Bin (Center ofr Practical use of Rare Materials, Sunchon National University)
Jung, Sung-Sik (Center ofr Practical use of Rare Materials, Sunchon National University)
Baek, Min-Sook (Center ofr Practical use of Rare Materials, Sunchon National University)
Yoon, Dong Joo (Center ofr Practical use of Rare Materials, Sunchon National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.3, 2020 , pp. 576-584 More about this Journal
Abstract
The extruder screw material is mainly SKD11, but the recent development of synthetic resins have increased the occurrence of chemical corrosion and wear. To solve this issue, high chromium cast iron is needed because of its good abrasion resistance and corrosion resistance, but its use is avoided because of its poor machinability. In this study, to improve the machinability of high chrome cast iron, 0, 0.5, 1.0, 1.5% of nickel, which has excellent workability, was added to high chromium cast iron with a composition of Fe-23Cr-2.5C-1.2Si-1.08Mn-0.48Mo-0.3V, and annealed after casting. Subsequently, the effect of nickel on the machinability and corrosion resistance was analyzed using a turning test and coin polarization test, and compared with SKD11. After casting using a high-frequency vacuum induction furnace, the annealing treatment was performed at 750 ℃ for five hours and then reheated at 1100 ℃ for five hours. A turning test after annealing at 750 ℃ showed that the machinability was improved remarkably when the nickel content was over 1.0%. In the potentiodynamic polarization test in a 5% NaCl solution, the corrosion resistance decreased with increasing nickel content in the as-cast and annealing treatment. On the other hand, after reheating, the corrosion resistance was best with a 1.5% nickel content.
Keywords
Cast Iron; Machinability; Corrosion Resistance; Turning Test; Potentiodynamic Polarization Test;
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