Analysis of Factors Affecting the Case Depth Hardness of Hardened Surface in Low Carbon Steel by Design of Experiments Using Limestone as an Energizer in Pack Carburizing Process
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Abstract
The objective of this paper is to study the factors that affect the case hardness and depth in hardening low-carbon steel with the pack carburizing process, using limestone as an energizer and the principle of design of experiments (DOE) to find a suitable factor of the case hardness and depth of samples. The design of experiments was split into 2 factors with 3 levels for each. The first factor was carburizing temperatures, which are 900, 950 and 1000 °C. The second factor was the carburizing times, which are 2, 4 and 6 hours. After carburizing, the specimens were then austenitized at 780 °C for 30 minutes and quenched suddenly in the water. The specimens were then tempered at 180 °C for 1 hour. The hardness of the specimens was measured by Micro-Vickers hardness testing. The results were analyzed using Minitab V.17. The result showed that both factors affected the case hardness and case depth and the effective case depth was 523 HV. with 900 °C carburizing temperature, with the carburizing time of 6 hours.
Article Details
Articles published in Journal of Industrial Technology Ubon Ratchathani Rajabhat University both hard copy and electronically are belonged to the Journal.
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