Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method

For engineering reasons, ductile Ni-resist alloys are widely used in oil and gas, automotive industries and elevated temperature purposes. Ductile Ni-resist offers an advantage because this alloy has an austenitic structure at all temperatures. However, ductile Ni-resist alloy faces economical limit...

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Main Author:	Mohd Rashidi, Maarof
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TJ Mechanical engineering and machinery TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/13529/16/Effect%20of%20magnesium%20addition%20on%20the%20microstructure%20and.pdf
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spelling	my-ump-ir.135292021-11-17T02:14:19Z Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method 2015-04 Mohd Rashidi, Maarof TJ Mechanical engineering and machinery TP Chemical technology For engineering reasons, ductile Ni-resist alloys are widely used in oil and gas, automotive industries and elevated temperature purposes. Ductile Ni-resist offers an advantage because this alloy has an austenitic structure at all temperatures. However, ductile Ni-resist alloy faces economical limitation due to the high price of nickel for alloying of ductile Ni-resist. Therefore, the present study aims to explore the possibility to reduce nickel consumption by substituting nickel with manganese to generate austenitic structure of ductile Ni-resist. Austenitic structure was formed by adding a nickel with much higher manganese percentage consumption as compared to standard usage. The control of carbide formation due to increasing Mnlwt. % was conducted using inoculation method. The effect on solidification was evaluated using cooling curve thermal analysis, complemented by microscopic observation and mechanical properties. It was observed that both Mn/wt. % and inoculation affect the austenitic structure and solidification cooling curve. Solidification cooling curve was lowered with increasing Mn/wt. %.It was also observed that graphite microstructure can be modified by both Mn/wt. % and inoculation. The morphology and graphite distribution was affected by increasing Mri/wt. % and inoculation. An isolated region due to segregation known as 'Last To Freeze' was the last area to solidify. Tensile strength and elongation at room temperature dropped by 21.5% (12Mn-lONi wt %) and 20.0% respectively as compared to D2 standard alloys. Tensile strength at elevated temperature showed that this alloy can withstand up to 150 MPa, dropped by 6.15% (12Mn-lONi wt. %) compared to D2 standard alloy. Corrosion test proved that corrosion rate is comparable to unmodified ductile Ni-resist. Three dense oxide layers were formed on the alloy surface at elevated temperature. A good agreement was observed between the result of the solidification cooling curve, microstructure and mechanical properties. 2015-04 Thesis http://umpir.ump.edu.my/id/eprint/13529/ http://umpir.ump.edu.my/id/eprint/13529/16/Effect%20of%20magnesium%20addition%20on%20the%20microstructure%20and.pdf pdf en public phd doctoral Universiti Teknologi Malaysia Faculty of Mechanical Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery TP Chemical technology
spellingShingle	TJ Mechanical engineering and machinery TP Chemical technology Mohd Rashidi, Maarof Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
description	For engineering reasons, ductile Ni-resist alloys are widely used in oil and gas, automotive industries and elevated temperature purposes. Ductile Ni-resist offers an advantage because this alloy has an austenitic structure at all temperatures. However, ductile Ni-resist alloy faces economical limitation due to the high price of nickel for alloying of ductile Ni-resist. Therefore, the present study aims to explore the possibility to reduce nickel consumption by substituting nickel with manganese to generate austenitic structure of ductile Ni-resist. Austenitic structure was formed by adding a nickel with much higher manganese percentage consumption as compared to standard usage. The control of carbide formation due to increasing Mnlwt. % was conducted using inoculation method. The effect on solidification was evaluated using cooling curve thermal analysis, complemented by microscopic observation and mechanical properties. It was observed that both Mn/wt. % and inoculation affect the austenitic structure and solidification cooling curve. Solidification cooling curve was lowered with increasing Mn/wt. %.It was also observed that graphite microstructure can be modified by both Mn/wt. % and inoculation. The morphology and graphite distribution was affected by increasing Mri/wt. % and inoculation. An isolated region due to segregation known as 'Last To Freeze' was the last area to solidify. Tensile strength and elongation at room temperature dropped by 21.5% (12Mn-lONi wt %) and 20.0% respectively as compared to D2 standard alloys. Tensile strength at elevated temperature showed that this alloy can withstand up to 150 MPa, dropped by 6.15% (12Mn-lONi wt. %) compared to D2 standard alloy. Corrosion test proved that corrosion rate is comparable to unmodified ductile Ni-resist. Three dense oxide layers were formed on the alloy surface at elevated temperature. A good agreement was observed between the result of the solidification cooling curve, microstructure and mechanical properties.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Rashidi, Maarof
author_facet	Mohd Rashidi, Maarof
author_sort	Mohd Rashidi, Maarof
title	Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
title_short	Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
title_full	Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
title_fullStr	Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
title_full_unstemmed	Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method
title_sort	effect of magnesium addition on the microstructure and properties of ductile ni-resist alloy using in-mould magnesium treatment method
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Mechanical Engineering
publishDate	2015
url	http://umpir.ump.edu.my/id/eprint/13529/16/Effect%20of%20magnesium%20addition%20on%20the%20microstructure%20and.pdf
_version_	1783731987892142080

Effect of magnesium addition on the microstructure and properties of ductile Ni-resist alloy using in-mould magnesium treatment method

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