?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=EFFECT+OFHEAT+TREATMENT%2C+PENGARUH+PERLAKUAN+PANAS%2C+VARIASI+SUHU+TEMPERING+DAN+LAMA+WAKTU+PENAHANAN+TERHADAP+KEKERASAN+DAN+STRUKTUR+MIKRO+BAJA+PEGAS+DAUN+KARBON+SEDANG+(TEMPERINGTEMPERATUREVARIATIONSANDHOLDING+TIMEONHARDNESSANDMICROSTRUCTURE+OFMEDIUMCARBONSTEELLEAF+SPRING)&rft.creator=Kusnadi%2C+SAHWENDI&rft.subject=Q+Science+(General)&rft.subject=QC+Physics&rft.description=Telahdilakukanpenelitianmengenai+pengaruh+perlakuan+panas%2C+variasi+suhu+tempering+dan+lama+waktu+penahanan+terhadap+kekerasan+dan+struktur+mikro+baja+pegas+daun+karbon+sedang.+Bahan+utama+yang+digunakan+pada+penelitian+ini+adalah+pegas+daun.+Pengambilan+data+meliputi+uji+komposisi+kimia%2C+kekerasan+dan+struktur+mikro+dengan+suhuaustenisasi+(hardening)+yaitu+835+oC+dengan+waktu+tahan+30+menit%2C+serta+variasi+suhu+tempering+425+oC+dan+625+oC+dengan+waktu+tahan+40+dan+60+menit.+Pengujian+kekerasan+dilakukan+dengan+menggunakan+metode+Rockwell.+Hasilujikomposisikimia%2C+menunjukkan+bajapegasdaunyang+digunakan+merupakan+bajakarbonsedang(C+%3D+0%2C57%25).+Hasiluji+kekerasan+tertinggi+yaitu+pada+suhu+835+oC%2C+yang+merupakan+pemanasan+hardening+yang+diikuti+dengan+pendinginan+quench+yaitu+sebesar+58%2C2+HRc%2C+sedangkan+nilai+kekerasan+awal+hanya+43%2C1+HRc.+Nilai+kekerasan+tempering+dan+pengaruh+waktu+tahan+pada+umumnya+menunjukkan+penurunan+nilai+kekerasan%2C+dimana+semakin+tinggi+suhu+tempering+dan+semakin+lama+waktu+penahanan+maka+nilai+kekerasannya+akan+semakin+kecil.+Hasil+ini+sesuai+dengan+tujuan+awal+penelitian+yaitu+menurunkan+nilai+kekerasan+baja+setelah+quench%2C+karena+baja+yang+terlalu+keras+akan+mudah+rapuh+dan+patah.+Hasil+struktur+mikro+juga+menunjukkan+perubahan+fasa+ferit+dan+perlit+sebelum+perlakuan+panas%2C+menjadi+martensit+setelah+perlakuan+panas+hardening%2C+dan+menjadi+martensit+temper+yang+lebih+halus+dan+merata+setelah+pemanasan+tempering.%0D%0AKata+kunci%3A+Perlakuan+panas%2C+baja+pegas+daun%2C+metodeRockwell%2C+kekerasan%2C+tempering%2C+waktu+tahan%2C+strukturmikro.+(Research+has+been+done+on+the+effect+of+heat+treatment%2C+tempering+temperature+variations+and+holding+time+onhardness+and+microstructure+of+medium+carbon+steel+leaf+spring.+The+main+materials+used+in+this+study+areleaf+spring.+Test+data+retrieval+include+chemical+composition%2C+hardness+and+microstructure+with+temperature+austenisasi+(hardening)+is+835+%C2%B0C+with+a+hold+time+of+30+minutes%2C+as+well+as+variations+in+tempering+temperature+425+%C2%B0C+and+625+%C2%B0C+with+a+hold+time+of+40+and+60+minutes.+Hardness+testing+do+with+using+Rockwell+method.+Chemical+composition+of+the+test+results%2C+showing+steel+leaf+spring+used+a+medium+carbon+steel+(C+%3D+0.57%25).+Highest+hardness+test+results+at+a+temperature+of+835+oC%2C+which+is+a+hardening+heating+followed+by+cooling+quench+by+58.2+HRc%2C+while+the+initial+value+of+only+43.1+HRc+hardness.+Hardness+values+and+tempering+effect+of+holding+time+generally+showed+a+decrease+in+hardness+values%2C+where+the+higher+the+tempering+temperature+and+the+longer+the+detention+the+hardness+value+will+be+smaller.+These+results+are+consistent+with+the+original+purpose+of+research+is+to+reduce+the+hardness+of+steel+after+quench%2C+because+the+steel+is+too+hard+will+be+brittle+and+fracture+easily.+Microstructure+results+also+showed+changes+in+the+phase+of+ferrite+and+pearlitebefore+heat+treatment%2C+to+martensiteafter+hardening+heat+treatment%2C+and+a+tempered+martensite+finer+and+evenly+after+tempering+heating.%0D%0AKeywords%3A+heat+treatment%2C+steelleaf+spring%2C+Rockwellmethod%2C+hardness%2C+tempering%2Choldtime%2C+microstructure.)&rft.publisher=Fakultas+MIPA&rft.date=2013-09-23&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F1%2FCOVER%2520DALAM.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F2%2FABSTRACT.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F3%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F4%2FHAL%2520MENGESAHKAN.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F5%2FHAL%2520MENYETUJUI.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F6%2FPERNYATAAN.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F7%2FDAFTAR%2520ISI.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F8%2FBAB%2520I.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F9%2FBAB%2520II.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F10%2FBAB%2520III.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F11%2FBAB%2520IV.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F12%2FBAB%2520V.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F878%2F13%2FDAFTAR%2520PUSTAKA.pdf&rft.format=archive&rft.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