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All Journal Journal of Materials Exploration and Findings
Mochtar, Myrna Ariati
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Effect of Austenization and Repeated Quenching on The Microstructures and Mechanical Properties of Wear-Resistant Steel Nugraha, Yanuar; Mochtar, Myrna Ariati
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

This study was focused on determining the effect of repeated austenitization and quenching on mechanical properties and microstructure. The experiment was carried out in a rolled quencher facility with a heat treatment process of one to two times, with parameters of an austenizing temperature of 9500C and quenching at a temperature of 8500C with pressurized water media. Testing of specimens, including microstructure observations and hardness testing. The repeated heat treatment process showed an increase in hardness of 0.79% on one-time repeated heat treatment and 1.65% on two repeated heat treatments. This occurs due to the presence accompanied by refinement of the prior austenite grains and the martensite structure. In addition, the hardness value decreases in the surface area 17.9 HV and 24.9 HV due to the deeper accumulation of decarburization 0.06-0.10 mm followed by thicker iron oxide growth 0.04-0.07mm.
The Effect of Parameters in Cryogenic Treatment on Mechanical Properties of Tool Steel: A Review Ekaputra, Ronaldus Caesariano; Mochtar, Myrna Ariati
Journal of Materials Exploration and Findings Vol. 2, No. 3
Publisher : UI Scholars Hub

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Tool steel is classified as special alloy steel which proposed as dies or mold materials as their high mechanical properties and dimensional stability. In order to improve tool steel’s mechanical properties, heat treatment process, especially, cryogenic treatment is conducted. Cryogenic treatment is done by exposing tool steel material at sub-zero liquid/gas media after heated at austenite temperature. This process significantly affects the martensite phase transformation increase and avoids retained austenite emersion. In particular, the higher martensite volume fraction, the higher hardness and wear resistance value of tool steel. It had been proven that adjusting critical process parameters of cryogenic treatment (temperature process, soaking period, and tempering process) shall increase the efficiency of improving mechanical properties of cryo-treated finished product.
Co-Authors Ekaputra, Ronaldus Caesariano Nugraha, Yanuar