?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+PROSES+PEMANASAN+DENGAN+VARIASI+MEDIA+PENDINGIN+TERHADAPNILAI+KEKERASAN+DAN+STRUKTUR+MIKRO+PADA+BAJA+KARBON+SEDANG+(EFFECT+PROCESS+OF+HEATING+WITH+VARIATIONS+OF+COOLING+MEDIA+TO+THE+VALUE+OF+HARDNESS+AND+MICROSTRUCTURE+THROUGH+MEDIUM+CARBON+STEEL)&rft.creator=Sarimin%2C+Dina+Restia+Ningrum&rft.subject=Q+Science+(General)&rft.subject=QP+Physiology&rft.description=Telah+dilakukan+penelitian+dengan+variasi+media+pendingin+terhadap+nilai+kekerasan+dan+struktur+mikro+pada+baja+pegas+daun.+Baja+pegas+daun+dilakukan+proses+heat+treatment+pada+temperatur+780oC+selama+20+menit.+Setelah+itu+baja+langsung+di+dinginkan+secara+cepat+(quenching)dengan+media+pendinginan+yang+berbeda+yaitu+udara%2C+air%2C+air+garam%2C+danoli.+Sampel+hasil+perlakuan+panas+dan+pendinginan+dilakukan+uji+komposisi+kimia%2C+uji+kekerasan%2C+dan+uji+struktur+mikro.+Hasil+penelitian+menunjukkan+bahwa+pengujian+komposisi+kimia%2C+baja+pegas+daun+termasuk+baja+karbon+sedang+(0%2C57567%25+C)%2Csetelah+proses+heat+treatment+sampel+tidak+mengalami+perubahan+komposisi+kimia.+Hasil+uji+kekerasan+nilai+rata-rata+tertinggi+pada+sampel+yang+menggunakan+quenching+air+garam+sebesar+61%2C25+HRC%2C+nilai+terendah+pada+sampel+quenching+udara+sebesar+22%2C94+HRC%2C+quenching+air+sebesar+59%2C45+HRC%2C+tetapi+pada+sampel+quenching+air+dan+air+garam+terdapat+keretakan+pada+permukaan+dan+quenching+oli+sebesar+58%2C54+HRC+yang+merupakan+media+pendingin+yang+relatif+baik+karena+dapat+meningkatkan+nilai+kekerasan+tanpa+mengalami+keretakan+pada+sampel.+Hasi+lstruktur+mikro+pada+sampel+quenching+udara+menghasilkan+butir-butir+ferit+dan+perlit+sedangkan+pada+sampel+quenching+air%2C+air+garam%2C+dan+oli+menghasilkan+butir-butir+martensit+dan+austenite+sisa.+Semakin+cepat+laju+pendinginan+pada+sampel%2C+maka+semakin+halus+butir-butir+kristal+dengan+nilai+kekerasan+yang+lebih+tinggi%2C+dan+sebaliknya+semakin+lambat+laju+pendinginan+pada+sampel+maka+semakin+besar+butir-butir+kristal+dengan+nilai+kekerasan+yang+rendah.%0D%0AKata+kunci%3A+Baja+pegas+daun%2C+proses+heat+treatment%2Cquenching%2C+uji+kekerasan%2Cstruktur+mikro.%0D%0A(Research+has+been+carried+out+with+variations+of+the+cooling+media+to+hardness+value+and+microstructure+of+leaf+spring+steel.+Leaf+spring+steel+was+heated+at+temperature+of+780%C2%B0C+for+20+minutes.+Further+process%2C+steel+was+cooled+quickly+(quenching)+with+kinds+of+cooling+medium%2C+those+were+air%2C+water%2C+salt+water%2C+and+oil.+Samples+of+heating+and+cooling+treatment+were+tested+by+chemical+composition%2C+hardness%2C+and+microstructure+test.+The+results+of+chemical+composition+test+showed+that+leaf+spring+steel+include+medium+carbon+steel+(0%2C57567%25+C)%2C+after+the+heat+treatment+process+samples+were+not+occurred+change+of+composition.+The+hardness+testing+revealed+that+highest+average+value+in+sample+using+salt+water+quenching+HRC+at+61%2C25%2C+the+lowest+value+in+the+sample+using+air+quenching+at+22%2C94+HRC%2C+water+quenching+at+59%2C45+HRC+and+oil+quenching+at+58%2C54+HRC.+Microstructure+results+in+sample+of+air+quenching+produces+grains+of+ferrite+and+pearlite%2C+whereas+the+quenching+samples+of+water+%2C+salt+water%2C+and+oil+produces+grains+of+martensite+and+residual+austenite.+The+faster+of+cooling+rate+in+the+samples+generating+the+more+finely+crystalline+grains+with+a+higher+hardness+value%2C+and+conversely+the+slower+of+the+cooling+rate+in+the+sample%2C+producing+the+crystal+grains+were+greater+with+low+hardness+values.%0D%0AKeywords%3Aleaf+spring+steel%2C+heat+treatment%2C+quenching%2C+hardness%2C+microstructure.)&rft.publisher=Fakultas+MIPA&rft.date=2013-12-23&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F1%2FCOVER%2520DALAM.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F2%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F3%2FABSTRACT.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F4%2FMENYETUJUI.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F5%2FSURAT%2520PERNYATAAN.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F6%2FDAFTAR%2520ISI.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F7%2FBAB%2520I.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F8%2FBAB%2520II.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F9%2FBAB%2520III.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F10%2FBAB%2520IV.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F11%2FBAB%2520V.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F12%2FDAFTAR%2520PUSTAKA.pdf&rft.format=archive&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F84%2F13%2FLAMPIRAN.zip&rft.identifier=++Sarimin%2C+Dina+Restia+Ningrum++(2013)+PENGARUH+PRO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