EFEK PRESTRAIN PADA STAINLEES STEEL 304 TERHADAP PERAMBATAN RETAK FATIK

I KOMANG SUARIANDI, 1215021039 (2018) EFEK PRESTRAIN PADA STAINLEES STEEL 304 TERHADAP PERAMBATAN RETAK FATIK. FAKULTAS TEKNIK, UNIVERSITAS LAMPUNG.

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Abstrak (Berisi Bastraknya saja, Judul dan Nama Tidak Boleh di Masukan)

Perambatan retak fatik Stainlees Steel 304 yang diberi prestrain sebesar 1%, 3% dan 5% menggunakan mesin MTS Landmark 100 kN pada temperatur ruang. Hasil pengujian tarik menunjukkan efek prestrain meningkatkan kekuatan mekaniknya seperti tegangan luluh dan tegangan maksimumnya, namun keuletan baja menurun. Laju perambatan retak fatik (da/dN) Stainlees Steel 304 yang tidak diprestrain da/dN=6,17×10-9ΔK1,323, prestrain 1% da/dN =6,28×10-9ΔK1,253, prestrain 3% da/dN=8,18×10-9ΔK1,181 dan prestrain 5% da/dN=22,52×10- 9ΔK0,825. Berdasarkan nilai laju perambatan retak fatik, prestrain menurunkan laju perambatan retak fatik Stainlees Steel 304. Prestrain yang diberikan pada Stainlees Steel 304 merubah orientasi dan ukuran butirnya. Prestrain menyebabkan ukuran butir mengecil, spesimen tanpa prestrain memiliki ukuran diameter butir rata-rata dbs=0,0997 mm, prestrain 1% d1%=0,0651 mm, prestrain 3% d3%=0,0539 mm dan prestrain 5% d5%=0,0509 mm. Ukuran butir mengecil seiring dengan besarnya prestrain yang berkontribusi menurunan laju perambaran retak fatiknya. Kata Kunci : stainlees steel 304, prestrain, retak fatik, ukuran butir ABSTRACT Fatigue crack propagation Stainless Steel 304 is given prestrained 1%, 3% and 5% used the Landmark MTS 100 kN at room temperature. The tensile test results show the prestrain effect increases the mechanical strength such as yield strength and ultimate tensile strength, but the steel toughness was decreases. Fatigue crack propagation rate (da / dN) Stainlees Steel 304 which is not prestrained da/dN=6,17×10-9ΔK1,323, prestrain 1% da/dN =6,28×10-9ΔK1,253, prestrain 3% da/dN=8,18×10-9ΔK1,181 and prestrain 5% da/dN=22,52×10-9ΔK0,825. Based on the rate of fatigue crack propagation, prestrain decreases the rate of fatigue crack propagation of Stainlees Steel 304. The prestrain given to Stainless Steel 304 for changed the orientation and size of the grains. Prestrain causes the grain size to decline, specimen without prestrain has average diameter size dbs=0,0997 mm, prestrain 1% d1%=0,0651 mm, prestrain 3% d3%=0,0539 mm dan prestrain 5% d5%=0,0509 mm. The size of the grains has declined with the amount of prestrain given which contributed to the decreasing rate of fatigue crack growth. Keywords: stainlees steel 304, prestrain, fatigue crack growth, grain size.

Jenis Karya Akhir: Skripsi
Subyek: > Teknik mesin dan mesin
> Teknik mesin dan mesin
Program Studi: Fakultas Teknik > Prodi S1-Teknik Mesin
Pengguna Deposit: 201889078 . Digilib
Date Deposited: 19 Apr 2018 04:33
Terakhir diubah: 19 Apr 2018 04:33
URI: http://digilib.unila.ac.id/id/eprint/31067

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