Study On Carburizing And The Kinetics Of Low Alloy Tool Steel

Munirah , Othman (2007) Study On Carburizing And The Kinetics Of Low Alloy Tool Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Carburizing is one of heat treatment process for hardening the steel by exposing the part to a Carbon rich atmosphere at an elevated temperature and allows diffusion to transfer the Carbon atoms into steel. The parts were simply placed in a suitable container and covered with a thick layer of carbon powder. Throughout this project, a square bar of20 x 20 x 20 mm dimension was cut for ten pieces. For the first analysis, one piece of specimen is used for hardness testing and microstructure analysis. The specimen should be grinded, polished and etching for the research. Another nine pieces of specimens are used for carburizing process. It is carburized in three different temperatures; 1073 K, 1123 K and 1173 K and three different times; three hour, six hour and nine hour. The surface hardness value before the carburizing process was ±98.6 HRB and after carburizing process, the result was ±84 HRB to ±100.4 HRB. The result of hardness was increased contributed to the temperature and time of carburizing process. Then, the data obtain from the carburized low alloy tool steel was analyzed and give activation energy value at 264.14 kJmor1 and the pre-exponential constant~) value at 1.03 x 10·10 m2s·1

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