Academic article: Spheroidizing Process and Applying to Pack Carburizing Process
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Abstract
The purpose of this article review was to compile contents and factors which affected the spheroidizing process, carburizing process, and carburizing process followed by the spheroidizing process for utilization in industrial, and academic matters. The findings of this study revealed that there were many methods for the spheroidizing process with the most used process being used with the cycle temperature at slightly lower and higher A1 temperature. The number of sequences of increased temperature found lighter cementite which had higher ultimate tensile strength, yield strength, and percent elongation. The essential factors in the pack carburizing process were composed of types of charcoal, catalyst, temperature, and time. The best charcoals to extend carbon were from eucalyptus, tamarind, the rootstock of cassava, coconut shell, and bamboo respectively. The study showed that calcium carbonate (CaCO3, commercial-grade) was the best catalyst along with the catalyst in calcium carbonate from nature. The temperature and time in the process affected carbon diffused to sample well, increased hardness, and reduced the efficiency of impact. Moreover, spheroidizing was used after finishing carburizing process, discovering the cementite network where the surface changed to a sphere shape but with the properties of toughness and elasticity still high. After carburizing process, the sample had increased hardness but after the spheroidizing process the hardness decreased. Time studies showed that a longer period in the spheroidizing process, led to lower hardness and increased impact.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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