Arifianto, Yuda (2017) Analisis Laju Perambatan Retak Akibat Stress Corrosion Cracking Pada Baja ASTM A36 Dengan Variasi Tegangan Bending dan Perbedaan pH. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
4313100028-Undergraduate_Theses.pdf - Published Version Download (4MB) | Preview |
Abstract
Korosi masih menjadi salah satu fenomena yang menjadi fokus masalah pada struktur anjungan lepas pantai terlebih pada pipa bawah laut. Lingkungan laut yang korosif dan kandungan kimia crude oil dengan tekanan dan temperaturnya yang tinggi menambah kerentanan terhadap korosi. Salah satu masalah korosi tersebut adalah stress corrosion cracking (SCC). Munculnya retak akibat korosi jenis SCC jika tidak dihindari maka akan berakibat buruk seperti kebocoran bahkan sampai failure. Penelitian ini dilakukan pada baja ASTM A36 yang melalui tahapan heat treatment hardening. Analisis dilakukan dengan membandingkan material menggunakan variasi tegangan bending sebesar 60% dan 80% SMYS. Pengujian korosi dengan uji imersi pada variasi waktu yang dilakukan yaitu 7 hari, 10 hari dan 14 hari pada larutan dengan pH asam, netral, dan basa. Laju perambatan retak terbesar pada hari 14 yaitu material AT2.1 tanpa heat treatment, dengan tegangan bending 80% SMYS dan pH asam dan terkecil pada AT1.3 tanpa heat treatment, tegangan bending 60% SMYS dan pH basa dengan nilai laju perambatan retak berturut-turut adalah 1041,39 μm dan 407,04 μm. Larutan pH asam adalah yang paling reaktif disusul oleh pH basa dan pH netral dengan nilai rata-rata laju perambatan retaknya berturut-turut yaitu 2,73 μm/jam, 2,33 μm/jam, dan 2,17 μm/jam.
=================================================================
Corrosion is one of phenomenon
s
which be main problem at offshore structure
especially for subsea pipeline. Sea environment that is so corrosive and chemical
contents of crude oil with its pressure and temperature inc
rease susceptibility to
corrosion phenomenons. One of them is stress corrosion cracking (SCC).
Appear
ance of crack
due to this SCC corrosion
if was not avoided it would
give
bad effect such
as leakage even failure of
subsea pipeline. This study experiment
used carbon steel ASTM A36 went through hardening heat treatment. Analysis be
done by comparing specimens to their value of bending strength which 60% SMYS
and 80% SMYS. Immersion test is us
ed as
corrosion experiment with various times
of immersion that ar
e 7 days, 10 days, and 14 days in ac
id, neutral and basic
solutions
. The highest crack propagation rate is specimen AT2.1 which non
-
heat
treatment, 80% SMYS of bending
strength and in acid solution while t
he lowest is
specimen AT1.3 which non
-
heat treatmen
t, 60% SMYS of bending strength and in
basic solution with their crack propagation rate values
are 1041,39 μm
and 407,04
μm. Acid solution is the most reactive with its average of crack propagation rate
is 2,73 μm/hr then basic solution and neutral solution with their average of crack propagation rate are 2,33 μm/hr and 2,17 μm/hr.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | ASTM A36, Heat Treatment, Bending, SMYS, SCC, Retak, pH. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Arifianto Yuda |
| Date Deposited: | 10 Oct 2017 07:29 |
| Last Modified: | 08 Mar 2019 06:38 |
| URI: | http://repository.its.ac.id/id/eprint/45823 |
Actions (login required)
 |
View Item |