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ITS » Undergraduate Theses » Teknik Kelautan
Posted by tondoindra@gmail.com at 17/11/2015 10:25:01  •  792 Views


STUDI EKSPERIMEN PENGARUH QUENCHING TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO PADA SAMBUNGAN PLAT ASTM A36

EXPERIMENTAL STUDY OF THE INFLUENCE OF QUENCHING ON MECHANICAL PROPERTIES AND MICROSTRUCTURE ON THE CONNECTION PLATE ASTM A36

Author :
DONALD ( 4309100070 )




ABSTRAK

Kebakaran yang terjadi pada struktur bangunan lepas pantai atau kapal dapat membuat struktur mengalami perubahan struktur mikro dan perubahan kekuatan. Penelitian ini bertujuan untuk mengetahui perubahan struktur mikro dan kekuatan tarik akibat proses quenching dengan variasi suhu waktu pemanasan dan media pendingin pada sambungan plat ASTM A36 sebagai simulasi kebakaran. Proses pengujian quenching dilakukan menggunakan kriteria yang ada dalam ASTM A709 pengujian tarik dilakukan menggunakan kriteria sesuai AWS D.1.1 dan analisa struktur mikro menggunakan kriteria sesuai. Dari hasil pengujian quenching Penurunan kekuatan tarik terbesar adalah sambungan yang dipanaskan pada suhu 950oC dengan waktu 60 menit dan dengan media air laut yaitu 326.96 MPa nilai yield strength dan 420.61 MPa nilai UTS. Penurunan ini masih dalam batas ijin tensile strength sesuai kriteria ASTM A36. Keuletan pada sambungan plat berbanding lurus dengan kekuatan tarik sambungan. Jika kekuatan plat menurun keuletan sambungan juga menurun. Penurunan kekuatan terkecil pada plat A3 disebabkan karena terbentuknya struktur austenite sisa yang membuat kekuatan struktur menjadi berkurang. Penurunan kekuatan terbesar pada plat B4 disebabkan karena terbentuknya struktur austenit sisa sehingga penurunan kekuatannya lebih besar dari A3. Hal ini disebabkan karena struktur austenit bersifat lunak namun tidak ulet.


ABSTRACT

Fire that occurred on the offshore structure or ship can make structure changes of micro-structure and the change of power. This research aims to know the change of microstructure and tensile strength due to quenching process with variations in temperature the time of heating cooling and media on a connection plate ASTM A36 as fire simulation. The testing process is done using quenching existing criteria in ASTM A709 tensile testing performed using appropriate criteria AWS D 1.1 and microstructure analysis using appropriate criteria. Test results of quenching decreasing the tensile strength is the biggest connection that is heated at a temperature of 950oC with a time of 60 minutes and with the media sea water 326.96 MPa yield strength value and 420.61 value MPa UTS. This decline is still within the bounds of appropriate tensile strength criteria permit ASTM A36. Ductility on the connection plate is directly proportional to the tensile strength of connection. If the strength of the ductility decreases the connection plate is also declining. The smallest power loss on a plate A3 due to formation of residual austenite structure that makes the power structure to be reduced. The biggest power loss on a plate structure formation due to B4 austenit remnants so his loss is larger than A3. This caused by structure austenite is malleable but not tenacious.



KeywordsASTM A36, keuletan, struktur mikro, quenching, tensile strength
 
Subject:  Pendinginan
Contributor
  1. Ir. Imam Rochani, M.Sc
  2. Yoyok Setyo Hadiwidodo, S.T, M.T, Ph.D
Date Create: 17/11/2015
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-43001150008001
Collection ID: 43001150008001
Call Number: RSKe 671.36 Don s


Source
Undergraduate Theses of Offshore Engineering RSKe 671.36 Don s, 2015

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Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-39592-4309100070-abstract_id.pdf - 168 KB
  2.  ITS-Undergraduate-39592-4309100070-abstract_en.pdf - 165 KB
  3.  ITS-Undergraduate-39592-4309100070-conclusion.pdf - 193 KB




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