Analysis of Micro Structure and Medium Hardness of Carbon Steel Isse Introduction Water, Oil and Air in the Hardening Process Using Cooling Media

Bambang Triono; Moch.  Shaleh; Fitria Rida Kusuma  Mambrasari

Authors

Bambang Triono University of Sunan Giri Surabaya
Moch. Shaleh University of Sunan Giri Surabaya
Fitria Rida Kusuma Mambrasari University of Sunan Giri Surabaya

Keywords:

S45C Steel, Temperature, Cooling Media, Hardness, Microstructure

Abstract

Hardening is a heat treatment process applied to produce hard workpieces. In the production process components and production equipment often experience friction and pressure, so components that have a hardness level that are able to accept this friction and pressure are needed. This research is an experimental research. The specimens used in this study were S45C clothes with a diameter of 25 mm and a thickness of 20 mm. The number of specimens tested amounted to 27 specimens. The specimens will be given Hardening heat treatment with temperature variations of 920 oC, 950 oC, 980 oC with a holding time of 35 minutes, followed by rapid cooling using water, SAE 30 oil and air. After that the specimen will be tested for hardness using the Hardness Rockwell Cone (HRC) standard. The results of the study showed that the highest Rockwell Hardness value ratio was obtained in a water cooling medium at a temperature of 920°C with the highest average hardness value of 55.1 HRC. Furthermore, the highest Rockwell hardness value using oil cooling medium occurs at a temperature of 920°C with the highest average hardness value of 30.8 HRC. While the lowest Rockwell hardness value occurs in air cooling media at a temperature of 920°C with the highest average hardness value of 21.6 HRC. The microstructure results show that more martensite is formed in the Hardening process with water and oil cooling media. While in the air cooling medium the amount of ferrite and pearlite increases. In conclusion, there are significant differences in hardness values in the Hardening process on medium carbon steel with water, oil and air cooling media. The hardness value of the results of the Hardening process with oil cooling media is between the hardness values of water and air cooling media at each temperature warmup

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