Df dan heat treatment
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Transcript of Df dan heat treatment
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DIAGRAM FASA DAN DIAGRAM FASA DAN PROSES HEAT TREATMENTPROSES HEAT TREATMENT
DIAGRAM FASA DAN DIAGRAM FASA DAN PROSES HEAT TREATMENTPROSES HEAT TREATMENT
INLASTEKINLASTEKSURABAYA SURABAYA 17 JANUARI 200917 JANUARI 2009
INLASTEKINLASTEKSURABAYA SURABAYA 17 JANUARI 200917 JANUARI 2009
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DIAGRAM FASADIAGRAM FASA
TYPE ITYPE ITYPE IITYPE IIType IIIType IIIType IVType IVType VType V
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PEGARUH STRUKTUR MKRO THD SIFAT MEKANIKPEGARUH STRUKTUR MKRO THD SIFAT MEKANIK
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MEKANISME PENGUATANMEKANISME PENGUATAN
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DIAGRAM FASE BESI-KARBONDIAGRAM FASE BESI-KARBONDANDAN
TRANSFORMASI EQUILIBRIUMTRANSFORMASI EQUILIBRIUM
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DIAGRAM FASA BESI-KARBON/FeDIAGRAM FASA BESI-KARBON/Fe33CC
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TRANSFORMASI FASATRANSFORMASI FASA
ISOTHERMAL TRANSFORMATIONISOTHERMAL TRANSFORMATIONSering disebut dg IT-diagram atau TTT-diagramSering disebut dg IT-diagram atau TTT-diagram
CONTINUOUS COOLING CONTINUOUS COOLING TRANSFORMATIONTRANSFORMATION
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ISOTHERMAL TRANSFORMATION
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HEAT TREATMENT HEAT TREATMENT (Perlakuan Panas)(Perlakuan Panas)
HEAT TREATMENT HEAT TREATMENT (Perlakuan Panas)(Perlakuan Panas)
Definisi:Definisi: Kombinasi antara pemanasan Kombinasi antara pemanasan dan pendinginan yang dilakukan pada dan pendinginan yang dilakukan pada temperatur,waktu, dan laju pendinginan temperatur,waktu, dan laju pendinginan terentu untuk mendapat kan sifat yang kita terentu untuk mendapat kan sifat yang kita inginkaninginkan
Macam-macam Heat Treatment:Macam-macam Heat Treatment:AnnealingAnnealing - Tempering- TemperingNormalizingNormalizing - Stress relief annealing- Stress relief annealingHardeningHardening - Surface hardening, dll- Surface hardening, dll
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A1A3A3A3
A1A1
Time (s)Time (s) Time (s)
Suhu (o C)
AnnealingNormalizing Hardening & Tempering
DIAGRAM FASA DIAGRAM FASA
BESI-KARBON/FeBESI-KARBON/Fe33CC
DIAGRAM PROSES DIAGRAM PROSES
HEAT TREATMENTHEAT TREATMENT
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Preheat ( Pemanasan Awal )Preheat ( Pemanasan Awal )
Adalah pemberian panas yang dilakukan pada saat sebelum dilaksanakan pengelasan, minimum temperatur preheat ditentukan oleh Code / Standart
Pengukuran temperatur dengan Crayon, Termocouple dll
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Preheat ( Pemanasan Awal )Preheat ( Pemanasan Awal )
Tujuan
* Mengurangi kecepatan pendinginan
pada base metal, HAZ, dan weld metal
( Keras, keuletan kurang )
* Mengurangi tegangan pengkerutan
didalam weld metal dan sekitarnya
* Menghindari Crack pada HAZ dan
Weld Metal
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Interpass TemperaturInterpass Temperatur
Adalah temperatur yang diukur pada saat akan melanjutkan pengelasan berikutnya
* Tinggi temperatur paling rendah harus
sama dengan temperatur preheat
* Interpass temperatur diukur nilai
maksimumnya
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Maintain Preheat TemperaturMaintain Preheat Temperatur
Adalah pemberian panas pada base metal pada temperatur tertentu sampai proses pengelasan selesai.
* Bila pengelasan harus berhenti MPT harus tetap dilakukan
* Tinggi temperatur ditentukan oleh Code
atau Customer / Clien
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Post Weld Heat TreatmentPost Weld Heat Treatment
Adalah pemberian panas pada base metal setelah pengelasan selesai pada kurun waktu tertentu dan pada temperatur tertentu ( sesuai Code )
* Temperatur pemanasan dan pendinginan direkam dengan Chart Recorder
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Post Weld Heat TreatmentPost Weld Heat Treatment
Tujuan PWHT :
* Mengurangi Tegangan Sisa (Stress relief)
* Mengurangi Kekerasan
* Distorsi Dll
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HARDENABILITYHARDENABILITY UJI JOMINYUJI JOMINY MEMPREDIKSI STRUKTUR MIKROMEMPREDIKSI STRUKTUR MIKRO MEMPREDIKSI SIFAT MEKANIK(KEKERASAN)MEMPREDIKSI SIFAT MEKANIK(KEKERASAN)
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STRUKTUR MIKRO CAST IRONSTRUKTUR MIKRO CAST IRON
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