?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+HOLDING+TIME+PADA+PROSES+ANNEALING+TERHADAP%0D%0ANILAI+KEKERASAN+DAN+KETANGGUHAN+BESI+COR+KELABU+FC25&rft.creator=Meilisa+%2C+Putri+Utami&rft.subject=620+Ilmu+teknik+dan+ilmu+yang+berkaitan&rft.description=Besi+Cor+Kelabu+FC25+adalah+salah+satu+material+baja+karbon+tinggi+yang+sedang%0D%0Abanyak+digunakan+sebagai+bahan+utama+pada+pembuatan+elemen+mesin+seperti%0D%0Asambungan+perpipaan%2C+poros%2C+engkol%2C+roda+gigi%2C+landasan+mesin.+Penelitian+ini%0D%0Abertujuan+untuk+mengetahui+pengaruh+lama+waktu+holding+time+pada+proses%0D%0Aannealing+terhadap+sifat+mekanik+dan+struktur+mikro+Besi+Cor+Kelabu+FC25.%0D%0APenelitian+ini+menggunakan+spesimen+berupa+Besi+Cor+Kelabu+FC25+yang%0D%0Adiberikan+perlakuan+panas+annealing+dengan+temperatur+850%C2%B0C+dengan+variasi%0D%0Aholding+time+30+menit%2C+60+menit+dan+120+menit%2C+kemudian+didinginkan+secara%0D%0Alambat+didalam+furnace+selama+30+jam.+Selanjutnya+dilakukan+pengujian+kekerasan%0D%0Ametode+Vickers+dan+pengujian+impak+metode+charpy.+Hasil+uji+kekerasan%0D%0Adidapatkan+nilai+kekerasan+sebelum+dilakukan+perlakuan+panas+sebesar+154%2C739849%0D%0Akg%2Fmm2.+Hasil+uji+kekerasan+setelah+dilakukan+perlakuan+panas+annealing+dengan%0D%0Aholding+time+30+menit%2C+60+menit+dan+120+menit+sebesar+152%2C662722+kg%2Fmm2%2C%0D%0A148%2C797411+kg%2Fmm2%2C+143%2C470735+kg%2Fmm2.+Hasil+pengujian+impak+didapatkan%0D%0Aenergi+impak+sebelum+dilakukan+perlakuan+panas+adalah+sebesar+3+Joule.+Hasil%0D%0Aenergi+impak+setelah+dilakukan+perlakuan+panas+annealing+dengan+holding+time+30%0D%0Amenit%2C+60+menit+dan+120+menit+sebesar+3%2C8+Joule%2C+4%2C06+Joule%2C+4%2C3+Joule.+Pada%0D%0Apengamatan+struktur+mikro+menggunakan+Optical+Microscopy+(OM)+menunjukkan%0D%0Aperubahan+fasa+grafit+flake+menjadi+grafit+nodular+dengan+butir+yang+lebih+besar.%0D%0A%0D%0AKata+kunci+%3A+Beci+Cor+Kelabu+FC25%2C+Annealing%2C+Holding+Time%2C+kekerasan%2C%0D%0Aketangguhan+dan+OM.%0D%0A%0D%0AABSTRACT%0D%0A%0D%0ATHE+EFFECT+OF+HOLDING+TIME+IN+THE+ANNEALING+PROCESS+ON%0D%0ATHE+HARDNESS+AND+IMPACT+STRENGTH+OF+FC25+GRAY+CAST%0D%0A%0D%0AIRON%0D%0ABy%0D%0AMeilisa+Putri+Utami%0D%0A%0D%0AFC25+Gray+Cast+Iron+is+a+high+carbon+steel+material+that+is+widely+used+as+the+main%0D%0Amaterial+in+the+manufacture+of+machine+elements+such+as+pipe+fittings%2C+shafts%2C%0D%0Acranks%2C+gears%2C+and+machine+beds.+This+study+aimed+to+determine+the+effect+of%0D%0Aholding+time+during+the+annealing+process+on+the+mechanical+properties+and%0D%0Amicrostructure+of+FC25+Gray+Cast+Iron.+This+research+used+FC25+Gray+Cast+Iron%0D%0Aspecimens+that+were+heat+treated+with+annealing+at+a+temperature+of+850%C2%B0C+with%0D%0Aholding+time+variations+of+30+minutes%2C+60+minutes%2C+and+120+minutes%2C+then+slowly%0D%0Acooled+in+the+furnace+for+30+hours.+Subsequently%2C+Vickers+hardness+testing+and%0D%0ACharpy+impact+testing+were+carried+out.+The+hardness+test+results+showed+a+hardness%0D%0Avalue+of+154.739849+kg%2Fmm2+before+heat+treatment.+The+hardness+test+results+after%0D%0Aannealing+heat+treatment+with+holding+times+of+30+minutes%2C+60+minutes%2C+and+120%0D%0Aminutes+were+152.662722+kg%2Fmm2%2C+148.797411+kg%2Fmm2%2C+and+143.470735+kg%2Fmm2%2C%0D%0Arespectively.+The+impact+test+results+showed+an+impact+energy+of+3+Joules+before%0D%0Aheat+treatment.+The+impact+energy+results+after+annealing+heat+treatment+with%0D%0Aholding+times+of+30+minutes%2C+60+minutes%2C+and+120+minutes+were+3.8+Joules%2C+4.06%0D%0AJoules%2C+and+4.3+Joules%2C+respectively.+Optical+Microscopy+(OM)+observation+of+the%0D%0Amicrostructure+showed+a+transformation+of+the+graphite+flake+phase+to+a+nodular%0D%0Agraphite+phase+with+larger+grains.%0D%0A%0D%0AKeywords%3A+FC25+Gray+Cast+Iron%2C+Annealing%2C+Holding+Time%2C+hardness%2C+toughness%2C%0D%0Aand+OM.&rft.publisher=FAKULTAS+TEKNIK&rft.date=2024-05-21&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F83075%2F1%2FABSTRAK%2520SKRIPSI%2520_MEILISA%2520PUTRI%2520UTAMI%25202015021024%2520-%2520meilisa%2520meilisa.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F83075%2F2%2FSKRIPSI%2520%2520FULL%2520MEILISA%2520PUTRI%2520UTAMI%25202015021024%2520-%2520meilisa%2520meilisa.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F83075%2F3%2FSKRIPSI%2520TANPA%2520PEMBAHASAN%2520MEILISA%2520PUTRI%2520UTAMI%25202015021024%2520-%2520meilisa%2520meilisa.pdf&rft.identifier=++Meilisa+%2C+Putri+Utami++(2024)+PENGARUH+HOLDING+TIME+PADA+PROSES+ANNEALING+TERHADAP+NILAI+KEKERASAN+DAN+KETANGGUHAN+BESI+COR+KELABU+FC25.++FAKULTAS+TEKNIK%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F83075%2F