Abstract
This study used an experimental method, in the form of the heat treatment hardening 930⁰C with the variations in the cooling media of the coconut water, table salt water, mineral waterwater, coolant radiator, and dromus water and variations in temperatures of tempering 200⁰C, 420⁰C, and 600⁰C, the specimens were cylindrical in diameter 25 mm and 20 mm in length, this study aims to determine the optimum hardness value of S45C steel specimens due to the heat treatment process hardening-tempering.
 From the results of the study, there is the effect of hardening 930⁰C there is the most optimal hardness value found in coconut water cooling media with the hardness level of 53.5 HRC. Under the influence of tempering 200⁰C there is the optimum hardness value found from the influence of mineral water cooling media with the hardness level of 50.7 HRC, while the influence of tempering 420⁰C there is the most optimal hardness value from the influence of mineral water cooling media with the hardness level of 41.8 HRC, and for tempering effect 600⁰C there is the most optimal hardness value available from the influence of the coconut water cooling media with the hardness level of 35.93 HRC.
Highlights
Peningkatan kekerasan baja biasanya menggunakan proses perlakuan panas
This study used an experimental method, in the form of the heat treatment hardening 9300C with the variations in the cooling media of the coconut water, table salt water, mineral waterwater, coolant radiator, and dromus water and variations in temperatures of tempering 2000C, 4200C, and 6000C, the specimens were cylindrical in diameter 25 mm and 20 mm in length, this study aims to determine the optimum hardness value of S45C steel specimens due to the heat treatment process hardening-tempering
Pada proses perlakuan panas hardening dengan pendinginan cepat dan dilakukan proses tempering menengah (4200C) ini sehingga transformasi fasa hanya masuk sampai didaerah fasa bainite dan temperatur belum cukup rendah untuk memasuki martensite star (Ms)
Summary
Peningkatan kekerasan baja biasanya menggunakan proses perlakuan panas (heat treatment). Dalam penelitian ini permasalahan yang perlu dikaji adalah berapa nilai kekerasan permukaan yang optimum terhadap kekerasan dari spesimen baja S45C setelah proses perlakuan panas hardening-tempering dengan media pendingin cepat yang digunakan yaitu air kelapa, air garam dapur, air mineral, air radiator coolant, dan air dromus.
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