PENGARUH PERLAKUAN PANAS HARDENING DENGAN QUENCHING OLI SAE 40 TERHADAP KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 4140

Haprabu, Elvin Panji Setyo (2020) PENGARUH PERLAKUAN PANAS HARDENING DENGAN QUENCHING OLI SAE 40 TERHADAP KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 4140. Skripsi thesis, Institut Teknologi Nasional.

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Abstract

The usefulness of steel is related to good mechanical properties when compared to other materials. One steel that is often used for engineering material needs is AISI 4140 steel. AISI 4140 steel is medium carbon steel and includes low alloy steel with carbon content of 0.42% and alloy element content below 10%. Based on the elemental content of the alloy, it is possible for AISI 4140 steel to be heat treated. Steel that is heat treated will change its mechanical properties in terms of hardness, toughness and ductility depending on the method used for the steel. Hardening is a heat treatment process for hardening steel by heating until a homogeneous phase change (austenization) is then followed by rapid cooling until a structure called martensite occurs. In this study the hardening heat treatment method will be used at a temperature of 850 ° C with a holding time of 30 minutes using quenching of SAE 40 oil on AISI 4140 steel. This research will conduct hardness testing (Rockwell) and microstructure in the specimen before and after the hardening heat treatment. Microstructure testing refers to the ASTM E562-19 standard, to calculate the percentage of the number of phases done manually calculation using clustering techniques with millimeter blocks, while for hardness testing refers to the ASTM E18 standard using Rockwell Hardness Test Scale C. From this test it can be concluded that heat treatment by hardening method using rapid cooling can change the microstructure and improve the mechanical properties of steel, especially hardness. Keywords: AISI 4140, hardening, quenching, phase, Rockwell, Micro Structure.

Item Type:	Thesis (Skripsi)
Subjects:	Engineering > Mechanical Engineering
Divisions:	Fakultas Teknologi Industri > Teknik Mesin S1 > Teknik Mesin S1(Skripsi)
Depositing User:	Handoyo Eka
Date Deposited:	19 Aug 2020 03:51
Last Modified:	19 Aug 2020 03:51
URI:	http://eprints.itn.ac.id/id/eprint/4913

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