?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=EVALUASI+SIFAT+FATIK+SIKLUS+RENDAH+(LOW+CYCLE+FATIGUE)+BAJA+ANIL+AISI+4140&rft.creator=PURNADI+SRI+KUNCORO%2C+1215021065&rft.subject=Teknik+mesin+dan+mesin&rft.description=Baja+AISI+4140+banyak+diaplikasikan+pada+komponen+elemen+mesin+poros+dan+roda+gigi+pada+kendaraan.+Komposisi+kimia+elemen-elemen+pemadu+yang+dominan+adalah+0.443C%2C+1.15Cr%2C+0.805Mn%2C+0.320Cu%2C+0.253Ni%2C+0.308Si%2C+dan+0.198Mo+(wt.%25).+Selama+aplikasi%2C+komponen-komponen+mesin+mengalami+pembebanan+siklik+pada+saat+kondisi+awal+dan+akhir+operasi+kendaraan.+Untuk+itu%2C+sifat+plastis+yang+besar+pada+baja+diperlukan+agar+deformasi+plastis+terjadi+pada+baja+dapat+meningkatkan+umur+fatiknya.+Perlakukan+anil+diberikan+pada+baja+AISI+4140+untuk+meningkatkan+daktilitas+baja+agar+daerah+plastis+lebih+besar+dari+daerah+elastisnya.+Kekuatan+tarik%2C+sifat+low+cycle+fatigue+dan+pengamatan+mikrostruktur+baja+dilakukan+untuk+mengevaluasi+perubahan+sifat+baja+setelah+dianil.+Pengujian+tarik+dilakukan+dengan+kontrol+displasemen+0.2+mm%2Fmin+(Standar+ASTM+E8)+dan+pengujian+low+cycle+fatigue+(ASTM+E606)+dengan+variasi++amplitudo+regangan+dari+0.003-0.007+mm%2Fmm+dengan+laju+regangan+konstan+0.005%2Fs.++Hasil+pengujian+tarik+menunjukan+bahwa+proses+anil+baja+AISI+4140+menurunkan+sifat+mekaniknya+dengan+tegangan+ultimate+turun+sebesar+39.0%25%2C+dan+tegangan+luluh+turun+sebesar+59.2%25.+Energy+regangan+plastis+meningkat+98.5%25+dan+elongasi+total+meningkat+29.34%25.+Nilai+exponensial+pengerasan+regangan+siklik+(n%E2%80%99)+meningkat+83%25+dibandingkan+nilai+koefisien+pengerasan+rengan+monotoniknya+(n).+Peningkatan+umur+fatik+baja+AISI+4140+secara+langsung+dipengaruhi+oleh+ferrit+yang+lebih+dominan+jumlahnya+setelah+proses+anil+dilakukan+pada+baja.+%0D%0A%0D%0AKata+kunci%3A+baja+AISI+4140%2C+low+cycle+fatigue%2C+proses+anil%2C+pengerasan+regangan%0D%0A%0D%0A%0D%0AABSTRACT%0D%0A%0D%0A%0D%0AAn+AISI+4140+steel+is+widely+applied+for+a+machine+element+components+on+vehicles.+A+Chemical+compositions+of+alloy+elements+are+0.443C%2C+1.15Cr%2C+0.805Mn%2C+0.320Cu%2C+0.253Ni%2C+0.308Si%2C+dan+0.198Mo+(wt.%25).+During+service%2C+the+machine+components+experienced+a+cyclic+loading+at+starting+and+shutting+down.++Therefore%2C+a+plastic+property+of+the+steel+is+needed+to+extent+a+fatigue+life+of+machine+components.++The+annealing-heat+treatment+was+performed+on+the+steel+for+increase+of+the+ductility%2C+and+thus+the+plastic+region+is+a+larger+size+than+the+elastic+region.++++The+mechanical+strength+and+the+low+cycle+fatigue+properties+of+the+annealed+steel+were+carried+out+according+to+ASTM+E8+standard+with+a+displacement+control+of+0.2+mm%2Fmin+and+ASTM+E606+standard+with+the+strain+amplitude+total+in+ranging+of+0.003-0.007+mm%2Fmm+under+a+constant+strain+rate+of+0.005%2Fs%2C+respectively.++The+tensile+tests+result+show+that+the+annealing+treatment+of+AISI+4140+decreased+of+the+ultimate+strength+of+about+39.0%25+and+the+yield+strength+of+about+59.2%25.+However%2C+the+plastic+strain+energy+was+increased+to+98.5%25+and+the+total+elongation+increased+about+29.34%25.+The+value+of+exponential+strain+hardening+cyclic+(n%E2%80%99)+increased+about+83%25+with+respect+to+the+value+of+exponential+strain+hardening+monotonic+(n).+An+amount+of+a+ferrite+phase+formed+on+the+steel+after+annealing+treatment+contributed+an+increase+in+low+cycle+fatigue+life+of+the+annealed+steel.++%0D%0AKeywords%3A+AISI+4140+steel%2C+low+cycle+fatigue%2C+annealing+treatment%2C+strain+hardening+%0D%0A%0D%0A&rft.publisher=UNIVERSITAS+LAMPUNG&rft.date=2018-02-22&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F30769%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F30769%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F30769%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++PURNADI+SRI+KUNCORO%2C+1215021065++(2018)+EVALUASI+SIFAT+FATIK+SIKLUS+RENDAH+(LOW+CYCLE+FATIGUE)+BAJA+ANIL+AISI+4140.++UNIVERSITAS+LAMPUNG%2C+FAKULTAS+TEKNIK.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F30769%2F