Analisis Pengaruh Cooling Rate Pada Proses Quenching Material ASTM A36 Akibat Kebakaran Kapal Terhadap Nilai Kekuatan, Kekerasan Dan Struktur Mikronya

Surentu, Stevanus Arie Nugroho (2016) Analisis Pengaruh Cooling Rate Pada Proses Quenching Material ASTM A36 Akibat Kebakaran Kapal Terhadap Nilai Kekuatan, Kekerasan Dan Struktur Mikronya. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemadaman api pada kasus kebakaran kapal biasanya menggunakan air laut. Proses pemadaman api menyerupai perlakuan panas dengan pendinginan cepat yaitu quenching. Quenching adalah salah satu perlakuan panas pada material dengan pendinginan dalam waktu yang singkat. Penelitian ini dilakukan untuk mengetahui pengaruh laju pendinginan cepat (quench) terhadap nilai kekuatan, kekerasan serta struktur mikro dari material dengan variasi waktu quenching 30,60 dan 90 menit serta variasi suhu 750oC, 850oC, dan 950oC untuk masing-masing perlakuan quenching. Hasil dari penelitian ini didapat, perbandingan antara material tanpa perlakuan dengan perlakuan memiliki nilai kuat tarik, kekerasan dan struktur yang berbeda. Diperoleh nilai kuat tarik berbanding lurus dengan nilai kekerasan namun beerbanding terbalik dengan diameter butir. Nilai kuat tarik tertinggi dimiliki oleh plat dengan perlakuan suhu 850oC dan quenching 30 menit dengan masing-masing nilainya 587.51 MPa sedangkan nilai kuat tarik terendah dimiliki oleh plat tanpa perlakuan dengan nilai masing-masing 294.817 MPa. Plat dengan nilai kekerasan tertinggi dimiliki oleh plat dengan perlakuan suhu 950oC dan quenching 30 menit dengan nilai kekerasan 167.07HV dan nilai kekerasan terendah dimiliki oleh plat tanpa perlakuan dengan nilai 108.17HV. Plat tanpa perlakuan memiliki diameter butir terbesar yaitu 85.99 μm dan plat dengan perlakuan suhu 950oC dan quenching 30 menit memiliki diameter besar butir 44.83 μm. Tingginya kuat tarik plat dengan perlakuan suhu 850oC juga disebabkan karena jumlah persentase pearlite yang tinggi sebesar 64.56%. ================================================================================================================== Extinguishing the fire case on ship usually use sea water. Extinguishing process resembles the heat treatment by rapid cooling is quenching. Quenching is a heat treatment of materials by cooling in a short time. This study was conducted to determine the effect of rapid cooling rate (quench) to the value of strength, hardness and microstructure of a material with a variation of 30.60 and a quenching time of 90 minutes and the temperature variation 750oC, 850°C, and 950oC for each treatment quenching. The results obtained from this study, a comparison between the material without treatment with treatment has a value of tensile strength, hardness and different structures. Tensile strength value obtained is directly proportional to the value of hardness but inversely proportional to the grain diameter. The highest tensile strength value owned by the plate with a temperature of 850°C and quenching treatment 30 minutes with each worth 587.51 MPa tensile strength while the lowest value owned by the plate without treatment with a value of 294 817 MPa respectively. Plates with the highest hardness value owned by the plate with a temperature of 950oC and quenching treatment 30 minutes with a hardness value 167.07 HV and lowest hardness values held by the plate without treatment with 108.17 HV value. Plates without treatment has the largest grain diameter is 85.99 μm and a plate with a temperature of 950oC and quenching treatment 30 minutes have large grain diameter 44.83 μm. The high tensile strength of the plate with a temperature of 850°C treatment due to high amount of pearlite percentage of 64.56%.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: ASTM A36, Quenching, laju pendinginan, uji tarik, uji kekerasan, struktur mikro, Cooling rate, tensile test, hardness test, microstructure
Subjects: V Naval Science > V Naval Science (General)
V Naval Science > VK1258 Ships--Fires and fire prevention
Divisions: Faculty of Marine Technology > Naval Architecture and Shipbuilding Engineering > (S1) Undergraduate Theses
Depositing User: STEVANUS ARIE NUHROHO
Date Deposited: 20 Mar 2017 03:28
Last Modified: 27 Dec 2018 07:49
URI: http://repository.its.ac.id/id/eprint/3889

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