Iffa Marina , Jopri (2013) Effect of heat treatment on the microstructures and mechanical properties of high carbon steel. Project Report. UTeM, Melaka. (Submitted)
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Abstract
This research covered mainly the effect of heat treatment on the microstructures and mechanical properties of high carbon steel SK3. There are four type of heat treatment process consist of annealing, quenching, normalizing and tempering. Composition analysis is conducted on the specimen to find the chemical composition. Specimen are heated at austenitizing temperature of 760ºC, 840ºC, 920ºC, 1000ºC and 1080ºC and hold for one hour soaking time. Specimens are cooled with three cooling medium which are oil quenching, air cooling, and furnace cooling. Tempering process is reheated the specimen at tempering temperature of 500 ºC with 10 minute soaking time and cool by normal temperature. The analyses for this research are mechanical test and metallurgical investigation before and after heat treatment process. Hardness result obtained 6.96HRC for as-received specimen. Increase in cooling rate produces to higher hardness value. Rapid cooling in quenched specimen shows highest hardness value of 56.34HRC. Moderate cooling rate in normalized specimen shows the intermediate hardness value whereas slow cooling rate in annealed specimen shows the lowest hardness value of 4.28HRC. Other than that, cooling rate effect to the grain size of the specimen. Slow cooling in annealed specimen produce coarse grain size and rapid cooling in quenched specimen produce fine grain size. Hardness in tempering process is lower than quenching process due to microstructural changes from martensite to tempered martensite. Besides, slow cooling form pearlite microstructure. Moderate cooling form bainite microconstituent. Whereas, rapid cooling produce martensite phase
| Item Type: | Final Year Project (Project Report) |
|---|---|
| Uncontrolled Keywords: | Steel alloys, Carbon steel |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Library > Final Year Project > FKM |
| Depositing User: | F Haslinda Harun |
| Date Deposited: | 03 Mar 2015 05:43 |
| Last Modified: | 28 May 2015 04:37 |
| URI: | http://digitalcollection.utem.edu.my/id/eprint/14287 |
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