Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure

The properties of low carbon steel are often tailored to suit specific application through the manipulation of microstructure. The microstructural features including morphology, martensite volume fraction and grain size. Such microstructural features can be changed by adjusting the soaking time and...

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Main Author:	Ahmad, Muhammad Syafiq
Format:	Thesis
Language:	English
Published:	2020
Subjects:	T Technology
Online Access:	http://eprints.usm.my/47535/1/Effect%20Of%20Cryorolling%20On%20The%20Microstructures%2C%20Mechanical%20Properties%20And%20Corrosion%20Behaviour%20Of%20Low%20Carbon%20Steel%20Using%20Martensite%20Starting%20Microstructure.pdf
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spelling	my-usm-ep.475352021-11-17T03:42:09Z Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure 2020-09-01 Ahmad, Muhammad Syafiq T Technology TA401-492 Materials of engineering and construction. Mechanics of materials The properties of low carbon steel are often tailored to suit specific application through the manipulation of microstructure. The microstructural features including morphology, martensite volume fraction and grain size. Such microstructural features can be changed by adjusting the soaking time and temperature within intercritical zone during heat treatment. The present works aims to study the effect of intercritical annealing followed by cryorolling on the microstructure, mechanical properties and corrosion behavior of low carbon steel with 0.06 wt% C. Low carbon steel underwent intercritical annealing through intermediate quenching and step quenching technique at 750°C, 800°C, 830°C and 850°C with various soaking times (3, 5, 10 and 15 minutes) and followed by rolling at cryogenic temperature at 90% reduction. The details microstructural characteristics and mechanical properties of cryorolled low carbon steel were investigated using optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Vicker microhardness and tensile test. A fibrous martensite morphology obtained from the intermediate quenched exhibits much better hardness compared to the blocky martensite morphology produced by step quenching treatment. A higher fraction of martensite volume and a much finer microstructure were obtained in intermediate quenched low carbon steel. Based on the hardness value (404.6 Hv), sample intercritically annealed via intermediate quenching process at 830°C (5 minutes) was chosen for different thickness reduction (50%, 70% and 90%) analysis. Hardness and tensile strength showed an increasing value with increasing percentage reduction, and the highest value obtained at 90% reduction with 429.4 Hv and 1537 MPa, respectively. The cryorolled sample at 90% reduction has the smallest crystallite size (13.70 nm) and highest lattice strain (74.6 x 10-3). Corrosion resistance decreases with thickness reduction, and the highest corrosion rate attained at 90% reduction with 5.968 mm/year. 2020-09 Thesis http://eprints.usm.my/47535/ http://eprints.usm.my/47535/1/Effect%20Of%20Cryorolling%20On%20The%20Microstructures%2C%20Mechanical%20Properties%20And%20Corrosion%20Behaviour%20Of%20Low%20Carbon%20Steel%20Using%20Martensite%20Starting%20Microstructure.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Penyelidikan Kejuruteraan Sungai Dan Saliran Bandar (REDAC)
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Ahmad, Muhammad Syafiq Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
description	The properties of low carbon steel are often tailored to suit specific application through the manipulation of microstructure. The microstructural features including morphology, martensite volume fraction and grain size. Such microstructural features can be changed by adjusting the soaking time and temperature within intercritical zone during heat treatment. The present works aims to study the effect of intercritical annealing followed by cryorolling on the microstructure, mechanical properties and corrosion behavior of low carbon steel with 0.06 wt% C. Low carbon steel underwent intercritical annealing through intermediate quenching and step quenching technique at 750°C, 800°C, 830°C and 850°C with various soaking times (3, 5, 10 and 15 minutes) and followed by rolling at cryogenic temperature at 90% reduction. The details microstructural characteristics and mechanical properties of cryorolled low carbon steel were investigated using optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Vicker microhardness and tensile test. A fibrous martensite morphology obtained from the intermediate quenched exhibits much better hardness compared to the blocky martensite morphology produced by step quenching treatment. A higher fraction of martensite volume and a much finer microstructure were obtained in intermediate quenched low carbon steel. Based on the hardness value (404.6 Hv), sample intercritically annealed via intermediate quenching process at 830°C (5 minutes) was chosen for different thickness reduction (50%, 70% and 90%) analysis. Hardness and tensile strength showed an increasing value with increasing percentage reduction, and the highest value obtained at 90% reduction with 429.4 Hv and 1537 MPa, respectively. The cryorolled sample at 90% reduction has the smallest crystallite size (13.70 nm) and highest lattice strain (74.6 x 10-3). Corrosion resistance decreases with thickness reduction, and the highest corrosion rate attained at 90% reduction with 5.968 mm/year.
format	Thesis
qualification_level	Master's degree
author	Ahmad, Muhammad Syafiq
author_facet	Ahmad, Muhammad Syafiq
author_sort	Ahmad, Muhammad Syafiq
title	Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
title_short	Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
title_full	Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
title_fullStr	Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
title_full_unstemmed	Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure
title_sort	effect of cryorolling on the microstructures, mechanical properties and corrosion behaviour of low carbon steel using martensite starting microstructure
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Penyelidikan Kejuruteraan Sungai Dan Saliran Bandar (REDAC)
publishDate	2020
url	http://eprints.usm.my/47535/1/Effect%20Of%20Cryorolling%20On%20The%20Microstructures%2C%20Mechanical%20Properties%20And%20Corrosion%20Behaviour%20Of%20Low%20Carbon%20Steel%20Using%20Martensite%20Starting%20Microstructure.pdf
_version_	1747821797275860992

Effect Of Cryorolling On The Microstructures, Mechanical Properties And Corrosion Behaviour Of Low Carbon Steel Using Martensite Starting Microstructure

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