Pengaruh heat input terhadap laju korosi pada pengelasan FCAW material duplex stainless steel 2205

Wibawa, Yuwana Galih (2009) Pengaruh heat input terhadap laju korosi pada pengelasan FCAW material duplex stainless steel 2205. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan industri pembangunan kapal untuk pemakaian baja tahan karat semakin meningkat, khususnya dalam industri pembangunan kapal tanker. Salah satu jenis baja tahan karat yang menarik untuk diteliti dan dikembangkan adalah baja tahan karat _duplex stainless steel 2205_. Baja tahan karat _duplex stainless steel 2205_ merupakan jenis baja tahan karat yang memiliki dua fase, yaitu ferrite dan austenite, dengan persentase kandungan yang sama. Meskipun ketahanan korosi _duplex stainless steel_ lebih baik daripada _austenitic stainless steel_, _duplex stainless steel_ tidak menyelesaikan semua permasalahan yang berkaitan dengan ketahanan korosi. Pengelasan pada paduan ini merupakan salah satu permasalahan yang dihadapi. Proses pendinginan pada _duplex stainless steel_ yang melewati rentang temperatur sensitis (1200°C–800°C) akan menyebabkan terjadinya _phase sigma_, yaitu sebuah _intermetallic phase_ yang terjadi apabila material _duplex stainless steel_ tertahan pada temperatur 1200°–800°C dan akan terbentuk minimal dalam waktu 100 detik, yang dapat menurunkan ketahanan korosi.

Pada penelitian ini dilakukan pengujian _duplex stainless steel 2205_ terhadap pengaruh variasi _heat input_, yaitu 0.53 kJ/mm, 1.59 kJ/mm, dan 2.94 kJ/mm. Spesimen yang digunakan sebanyak 9 buah untuk 3 variasi _heat input_. Untuk 1 variasi _heat input_ terdapat 3 spesimen agar hasil pengujian dapat memperoleh data yang lebih akurat. Ukuran spesimen adalah 50 mm × 10 mm × 12.5 mm, diambil melintang terhadap arah las. Kemudian dilakukan pengujian _ferrite number_ dengan _ferrite scope MP30_, pengujian foto mikro, pengujian laju korosi, dan pengujian foto makro. Pengujian laju korosi menggunakan sel tiga elektroda dengan larutan elektrolit _ferric chloride (FeCl₃)_.

Berdasarkan hasil pengujian dan perhitungan laju korosi, diperoleh nilai laju korosi untuk _heat input_ 0.53 kJ/mm, 1.59 kJ/mm, dan 2.94 kJ/mm, yaitu sebesar 0.0334 mmpy, 0.0404 mmpy, dan 0.0426 mmpy. Maka dapat diketahui bahwa semakin tinggi _heat input_, semakin besar laju korosi yang diperoleh. Dari hasil pengujian foto mikro diperoleh harga _ferrite content_ yang semakin meningkat dengan naiknya _heat input_ pengelasan.
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The demand of the shipbuilding industry for stainless steel has been increasing, especially for tanker vessels. One type of stainless steel that is of interest for research and development is duplex stainless steel 2205. Duplex stainless steel 2205 is a type of stainless steel that consists of two phases, ferrite and austenite, with approximately equal percentages.

Although the corrosion resistance of duplex stainless steel is better than that of austenitic stainless steel, duplex stainless steel cannot solve all problems related to corrosion resistance. The welding process of duplex stainless steel creates several problems, particularly those related to corrosion resistance. The cooling process of duplex stainless steel that passes through the sensitization temperature range (1200°C–800°C) can cause the formation of the sigma phase. This phase can reduce corrosion resistance.

This research examined 9 specimens with 3 variations of heat input, namely 0.53 kJ/mm, 1.59 kJ/mm, and 2.94 kJ/mm. For each heat input variation, 3 specimens were tested to obtain more accurate data. The specimen size was 50 mm × 10 mm × 12.5 mm, taken transverse to the weld direction. Ferrite number measurements were carried out using a Ferrite Scope MP30. Ferrite content and corrosion rate tests using the three-electrode cell method were also conducted. The corrosive medium used for the corrosion test was 6% ferric chloride (FeCl₃).

The results indicated that for heat inputs of 0.53 kJ/mm, 1.59 kJ/mm, and 2.94 kJ/mm, the corrosion rates were 0.0334 mmpy, 0.0404 mmpy, and 0.0426 mmpy, respectively. According to the test results, higher heat input increased the corrosion rate. Micrographs also showed that higher heat input increased the ferrite content.

Item Type:	Thesis (Other)
Additional Information:	620.112 23 Wib p
Uncontrolled Keywords:	intermetalic phase, phase sigma, heat input, ferrite number, ferrite content, intermetallic phase, sigma phase, heat input, ferrite number, ferrite content
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	magang .
Date Deposited:	08 Oct 2026 01:44
Last Modified:	08 Oct 2026 01:44
URI:	http://repository.its.ac.id/id/eprint/145417

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