Preparation and characterization of nano crystalline structures on CK60 steel by drilling method

Drilling as a surface severe plastic deformation (SSPD) method has been applied to commercial CK60 steel plate to create a nano crystalline (NC) structured layer. In the present study, the CK60 steel plate has been quenched in room temperature water from 950 °C and tempered at 350°C for one hour. Dr...

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Main Author:	Nosrati, Shohreh
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Nanostructured materials Microscopy - Technique
Online Access:	http://psasir.upm.edu.my/id/eprint/56117/1/FK%202013%2093RR.pdf
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id	my-upm-ir.56117
record_format	uketd_dc
spelling	my-upm-ir.561172017-07-20T08:29:53Z Preparation and characterization of nano crystalline structures on CK60 steel by drilling method 2013-06 Nosrati, Shohreh Drilling as a surface severe plastic deformation (SSPD) method has been applied to commercial CK60 steel plate to create a nano crystalline (NC) structured layer. In the present study, the CK60 steel plate has been quenched in room temperature water from 950 °C and tempered at 350°C for one hour. Drilling was done with use of a Ti-oxide coated drilling bit at 5, 10, 15 and 20 m/min cutting speeds. The microstructure of the samples was studied by an Optical Microscope and by a field emission scanning electron microscope (FESEM). The formation of an NC layer having a grain size in the order of 50 nm was confirmed by SEM observation and by applying the Hall-Petch formula on the samples drilled at a 20 m/min speed. The fine grain zone created was separated from the base metal structure and clear boundary with a 1 to 10 μm thickness when the drilling speed changed from 15 to 20 m/min. The result of the micro-hardness test determined that the hardness of the surface NC layer increased by more than twice compared with the coarse grain structure of the base metal. The annealing test on the nano crystallized samples in the range 400 to 650 °C showed that the NC layer is thermally stable and the micro-hardness of the surface layer showed a small decrease after 1 hr tempering at 650 °C from 9.8 to 9.1 GPa. Nanostructured materials Microscopy - Technique 2013-06 Thesis http://psasir.upm.edu.my/id/eprint/56117/ http://psasir.upm.edu.my/id/eprint/56117/1/FK%202013%2093RR.pdf application/pdf en public masters Universiti Putra Malaysia Nanostructured materials Microscopy - Technique
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Nanostructured materials Microscopy - Technique
spellingShingle	Nanostructured materials Microscopy - Technique Nosrati, Shohreh Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
description	Drilling as a surface severe plastic deformation (SSPD) method has been applied to commercial CK60 steel plate to create a nano crystalline (NC) structured layer. In the present study, the CK60 steel plate has been quenched in room temperature water from 950 °C and tempered at 350°C for one hour. Drilling was done with use of a Ti-oxide coated drilling bit at 5, 10, 15 and 20 m/min cutting speeds. The microstructure of the samples was studied by an Optical Microscope and by a field emission scanning electron microscope (FESEM). The formation of an NC layer having a grain size in the order of 50 nm was confirmed by SEM observation and by applying the Hall-Petch formula on the samples drilled at a 20 m/min speed. The fine grain zone created was separated from the base metal structure and clear boundary with a 1 to 10 μm thickness when the drilling speed changed from 15 to 20 m/min. The result of the micro-hardness test determined that the hardness of the surface NC layer increased by more than twice compared with the coarse grain structure of the base metal. The annealing test on the nano crystallized samples in the range 400 to 650 °C showed that the NC layer is thermally stable and the micro-hardness of the surface layer showed a small decrease after 1 hr tempering at 650 °C from 9.8 to 9.1 GPa.
format	Thesis
qualification_level	Master's degree
author	Nosrati, Shohreh
author_facet	Nosrati, Shohreh
author_sort	Nosrati, Shohreh
title	Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
title_short	Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
title_full	Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
title_fullStr	Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
title_full_unstemmed	Preparation and characterization of nano crystalline structures on CK60 steel by drilling method
title_sort	preparation and characterization of nano crystalline structures on ck60 steel by drilling method
granting_institution	Universiti Putra Malaysia
publishDate	2013
url	http://psasir.upm.edu.my/id/eprint/56117/1/FK%202013%2093RR.pdf
_version_	1747812116421672960

Preparation and characterization of nano crystalline structures on CK60 steel by drilling method

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