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Rochim Suratman
Guru Besar Teknik Mesin ITB
Mechanical Engineering

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PENGARUH PENAMBAHAN UNSUR Cr DAN Cu TERHADAP KEKUATAN TARIK BESI COR KELABU FC20 Suprihanto, Agus; Satrijo, Djoeli; Suratman, Rochim
ROTASI Volume 9, Nomor 1, Januari 2007
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (315.469 KB) | DOI: 10.14710/rotasi.9.1.17-24

Abstract

The mechanical properties of grey cast iron are influenced by cooling rate, thickness of casting, heat treatment,liquid treatment and alloying. Some aplications of its materials need high strength grey cast iron. To improve itstensile strength usually its added with unsures which known as carbide promoteur ie. Cr and Cu.In these research the effect of Cr and Cu on the mechanicals properties of grey cast irons has been evaluated.Base material FC 20 which alloyed with Cr 0,23 %, 0, 32% and 0,47% and Cu between 0,6% to 0,7% have beentested. The tensile test and metallographyc examinations have been conducted to known of its efects.From tensile test there is an improvement of tensile strength about 20% from 191MPa to 232MPa. However themicrostructure of specimens are same which are pearlitic grey cast irons, with graphite type VII (flake), Adistributions and size of graphite are 3-5.
PENGARUH PENAMBAHAN KROMIUM DAN TEMBAGA TERHADAP KEKUATAN LELAH BESI COR KELABU Suprihanto, Agus; Suratman, Rochim
ROTASI Volume 8, Nomor 1, Januari 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (517.577 KB) | DOI: 10.14710/rotasi.8.1.1-7

Abstract

The mechanical properties of grey cast irons can be modified with alloying elements. Cr and Cu have beenknown as elements that can improve tensile strength of grey cast irons. The improvement of tensile strength can beinfluence of fatigue strength. The goal of this research is to study the effect of alloying Cr and Cu on the fatiguestrength.Four materials of grey cast irons have been conducted to high cycle fatigue testing on the rotating bendingmachine. The first material is grey cast irons without added Cr and Cu, and the other have added. The percentages ofCr have been added are 0,23% wt, 0,32%wt and 0,47%wt and Cu 0,6%wt to 0,7%wt. The metallographyc examinationsand tensile test also have been conducted.The result of this research are the material has the same microstructure. The microstructures of its materials arepearlitic grey cast irons with graphite type VII, distribution A and size of graphite 3-5. The tensile, endurance andfatigue strength of materials, which added Cr and Cu significantly rising, compared with base materials. The tensilestrength rose from 191MPa to 232MPa and the endurance strength raised from 94 MPa to 110MPa. However threemodified materials, which added Cr, and Cu has the same effects.
Co-Authors Agus Suprihanto Ako, Henry Azis Azis, Azis Bandanadjaja, Beny Basuki, Arif Batam W, Durman Djoeli Satrijo Handojo Handojo IGN Wiratmaja Puja Kuswaya, Dikdik M, Sudin Mardiyati, Mardiyati Muchsin Muchsin Prasetia, Hariadi Tri Ramelan, Aditianto Reza, Reza Santosa, Sigit Puji Srahputri, Nurdesri Steven Steven Surdia, Tata Sutjiatmo, Bambang Widyanto, B Yudiyanto, Oyok