Abstract
The feasibility of using coconut shell powder (CSP) and dog conch shell powder (DCSP) as carburizing media in the pack carburization of SCM 420 steel was investigated. The carbon content and surface hardness of the carburized specimens prepared with different CSP:DCSP ratios and carburizing durations were examined and compared. A CSP:DCSP ratio of 60%:40% and an extended carburizing time of 12 h were found to increase the carbon content of the carburized specimens to 1.14 ± 0.007 wt%. Furthermore, the surface hardness was significantly improved to 961.3 ± 4.918 HV following water quenching. Finally, the thickness of the carburized layer of the quenched specimens increased by around 2.5 times as the carburizing duration was increased from 3 to 12 h.
Highlights
Extended Carburization Time.Low-to-medium-carbon steels, such as SCM 420, have excellent ductility and high toughness, and are used to manufacture many automobile components, such as racks and gears, shafts, pinions, cams, rockers, axles, valves, and so on [1,2,3,4]
The results show that for all values of the coconut shell powder (CSP):dog conch shell powder (DCSP) ratio, the carbon content increased with an increasing carburizing time
This study investigated the viability of dog conch shell powder (DCSP) and coconut shell powder (CSP) as carburizing media for the pack carburization of SCM 420 steel at a temperature of 950 ◦ C
Summary
Extended Carburization Time.Low-to-medium-carbon steels, such as SCM 420, have excellent ductility and high toughness, and are used to manufacture many automobile components, such as racks and gears, shafts, pinions, cams, rockers, axles, valves, and so on [1,2,3,4]. Traditional heat-treatment methods fail to yield a significant improvement in the strength and hardness of low-carbon steel components. Induction hardening, cold-working, immersion hardening, and case carburizing are generally preferred [5,6,7]. Among these methods, case carburizing is effective and is one of the most commonly used [8]. The finished component has an extremely high surface hardness while retaining the natural toughness and ductility of the original material in the core [9,10]. The material properties of the component can be tuned by adjusting the time and temperature of the carburizing process [11,12,13,14]
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