A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL

The rapid development of the automotive industry continuously demands improvements in various factors, such as safety, efficiency, and cost-effectiveness. Enhancements in these factors can be achieved by optimizing the materials used in vehicle construction. Dual-phase steel, produced through interc...

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Main Author: Yusup Iskandar, Maulana
Format: Final Project
Language:Indonesia
Online Access:https://digilib.itb.ac.id/gdl/view/86180
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Institution: Institut Teknologi Bandung
Language: Indonesia
id id-itb.:86180
spelling id-itb.:861802024-09-15T12:22:49ZA STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL Yusup Iskandar, Maulana Indonesia Final Project Dual-phase steel, SS400 steel, heat treatment, intercritical annealing INSTITUT TEKNOLOGI BANDUNG https://digilib.itb.ac.id/gdl/view/86180 The rapid development of the automotive industry continuously demands improvements in various factors, such as safety, efficiency, and cost-effectiveness. Enhancements in these factors can be achieved by optimizing the materials used in vehicle construction. Dual-phase steel, produced through intercritical annealing heat treatment, is widely used in the automotive industry due to its strong, tough, and formable properties. SS400 steel, a low-carbon steel, is easily accessible and relatively inexpensive. By using cheaper raw materials and engineering their mechanical properties, production costs can be reduced, and efficiency can be improved without compromising safety. In this study, variations of normalizing, quenching, and intercritical annealing heat treatments were applied to SS400 steel to observe the microstructure and mechanical properties. The normalizing treatment was conducted at 870 °C with a 10-minute holding time, followed by air cooling. The specimens were then austenitized again at temperatures of 870 °C, 900 °C, and 930 °C for 10 minutes before being quenched. Subsequently, the specimens underwent intercritical annealing at 750 °C, 770 °C, and 800 °C. These were compared with conventional heat treatments at the same intercritical annealing temperatures. Characterization was carried out through tensile testing, Vickers hardness testing, metallography using an optical microscope, and fractography using SEM. Based on the characterization data, the effects on microstructure and mechanical properties were determined. The results showed that the obtained microstructure consisted of ferrite and martensite phases. There was a trend of increasing strength and hardness with rising austenitizing and intercritical annealing temperatures, reaching maximum values of 843.8 MPa and 331 HV at 930 °C austenitizing and 800 °C intercritical annealing. The maximum Charpy impact energy was obtained at 900 °C austenitizing and 750 °C intercritical annealing, with a value of 90,24 J/cm2. The maximum elongation was achieved at 870 °C austenitizing and 750 °C intercritical annealing, with a value of 26%. The fracture mechanism was a mixture of brittle and ductile fractures. The SS400 steel subjected to the heat treatments in this study successfully entered the region of 1st Gen Advanced High Strength Steel. text
institution Institut Teknologi Bandung
building Institut Teknologi Bandung Library
continent Asia
country Indonesia
Indonesia
content_provider Institut Teknologi Bandung
collection Digital ITB
language Indonesia
description The rapid development of the automotive industry continuously demands improvements in various factors, such as safety, efficiency, and cost-effectiveness. Enhancements in these factors can be achieved by optimizing the materials used in vehicle construction. Dual-phase steel, produced through intercritical annealing heat treatment, is widely used in the automotive industry due to its strong, tough, and formable properties. SS400 steel, a low-carbon steel, is easily accessible and relatively inexpensive. By using cheaper raw materials and engineering their mechanical properties, production costs can be reduced, and efficiency can be improved without compromising safety. In this study, variations of normalizing, quenching, and intercritical annealing heat treatments were applied to SS400 steel to observe the microstructure and mechanical properties. The normalizing treatment was conducted at 870 °C with a 10-minute holding time, followed by air cooling. The specimens were then austenitized again at temperatures of 870 °C, 900 °C, and 930 °C for 10 minutes before being quenched. Subsequently, the specimens underwent intercritical annealing at 750 °C, 770 °C, and 800 °C. These were compared with conventional heat treatments at the same intercritical annealing temperatures. Characterization was carried out through tensile testing, Vickers hardness testing, metallography using an optical microscope, and fractography using SEM. Based on the characterization data, the effects on microstructure and mechanical properties were determined. The results showed that the obtained microstructure consisted of ferrite and martensite phases. There was a trend of increasing strength and hardness with rising austenitizing and intercritical annealing temperatures, reaching maximum values of 843.8 MPa and 331 HV at 930 °C austenitizing and 800 °C intercritical annealing. The maximum Charpy impact energy was obtained at 900 °C austenitizing and 750 °C intercritical annealing, with a value of 90,24 J/cm2. The maximum elongation was achieved at 870 °C austenitizing and 750 °C intercritical annealing, with a value of 26%. The fracture mechanism was a mixture of brittle and ductile fractures. The SS400 steel subjected to the heat treatments in this study successfully entered the region of 1st Gen Advanced High Strength Steel.
format Final Project
author Yusup Iskandar, Maulana
spellingShingle Yusup Iskandar, Maulana
A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
author_facet Yusup Iskandar, Maulana
author_sort Yusup Iskandar, Maulana
title A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
title_short A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
title_full A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
title_fullStr A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
title_full_unstemmed A STUDY OF DUAL PHASE STEEL THROUGH HEAT TREATMENTS OF INTERMEDIATE QUENCHING AND INTERCRITICAL ANNEALING ON SS400 STEEL
title_sort study of dual phase steel through heat treatments of intermediate quenching and intercritical annealing on ss400 steel
url https://digilib.itb.ac.id/gdl/view/86180
_version_ 1822010969242468352