The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan

This research project describes the study of gaseous thermochemical treatment of nitriding duplex stainless steel (DSS) by using a tube furnace. DSS is widely used in various industries such as petrochemical, chemical processing plant and others. However, this material experiences wear and hardness...

Full description

Saved in:

Bibliographic Details
Main Author:	Paijan, Lailatul Harina
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Thermochemistry
Online Access:	https://ir.uitm.edu.my/id/eprint/13994/1/13994.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uitm-ir.13994
record_format	uketd_dc
spelling	my-uitm-ir.139942022-03-30T06:25:46Z The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan 2014-06 Paijan, Lailatul Harina Thermochemistry This research project describes the study of gaseous thermochemical treatment of nitriding duplex stainless steel (DSS) by using a tube furnace. DSS is widely used in various industries such as petrochemical, chemical processing plant and others. However, this material experiences wear and hardness failure during service.Therefore, new development of low temperature nitriding has been introduced to improve the surface properties of this material. The improvement of wear properties and hardness relies on the development of a hard layer on the surface. The nitriding was performed in a temperature range between 400°C, 450°C and 500°C for 6 and 14 hours. The gas composition used for this study was 50% NH3+ 50% N2 and 250/0 NH3 + 75% N2• The structural development was characterised using microhardness, X-ray diffraction (XRD), optical microscope, scanning electron microscopy (SEM) and wear resistance test. Based on this study, at a constant temperature of450°C with 50%'NH3 had produced highest thickness for expanded austenite with 13.96 urn for 6 hours treatment and increased to 76.17 urn for 14 hours treatment. This also led to a significant increase on top surface hardness about 666.3 HV and 962.59 HV for 6 and 14 hours treatment, respectively. For XRD analysis, it clearly shows that Bragg reflections (peaks) for nitrided samples are slightly shifted to lower 29 angles compared to untreated sample due to formation of expanded austenite. However, increased treatment temperature to 500°C with 25% and 50% ammonia can lead to the formation of chromium nitride precipitates in the nitrogen enriched layer, and thus deteriorate the corrosion resistance of material. It is hope that the study can contribute to the improvement of surface engineering technology of this material for wide range application purposes. 2014-06 Thesis https://ir.uitm.edu.my/id/eprint/13994/ https://ir.uitm.edu.my/id/eprint/13994/1/13994.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Mechanical Engineering Nor Berhan, Mohamad (Prof. Ir. Dr.) Haruman, Esa (Assoc. Prof. Dr.) Adenan, Mohd Shahriman
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Nor Berhan, Mohamad (Prof. Ir. Dr.) Haruman, Esa (Assoc. Prof. Dr.) Adenan, Mohd Shahriman
topic	Thermochemistry
spellingShingle	Thermochemistry Paijan, Lailatul Harina The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
description	This research project describes the study of gaseous thermochemical treatment of nitriding duplex stainless steel (DSS) by using a tube furnace. DSS is widely used in various industries such as petrochemical, chemical processing plant and others. However, this material experiences wear and hardness failure during service.Therefore, new development of low temperature nitriding has been introduced to improve the surface properties of this material. The improvement of wear properties and hardness relies on the development of a hard layer on the surface. The nitriding was performed in a temperature range between 400°C, 450°C and 500°C for 6 and 14 hours. The gas composition used for this study was 50% NH3+ 50% N2 and 250/0 NH3 + 75% N2• The structural development was characterised using microhardness, X-ray diffraction (XRD), optical microscope, scanning electron microscopy (SEM) and wear resistance test. Based on this study, at a constant temperature of450°C with 50%'NH3 had produced highest thickness for expanded austenite with 13.96 urn for 6 hours treatment and increased to 76.17 urn for 14 hours treatment. This also led to a significant increase on top surface hardness about 666.3 HV and 962.59 HV for 6 and 14 hours treatment, respectively. For XRD analysis, it clearly shows that Bragg reflections (peaks) for nitrided samples are slightly shifted to lower 29 angles compared to untreated sample due to formation of expanded austenite. However, increased treatment temperature to 500°C with 25% and 50% ammonia can lead to the formation of chromium nitride precipitates in the nitrogen enriched layer, and thus deteriorate the corrosion resistance of material. It is hope that the study can contribute to the improvement of surface engineering technology of this material for wide range application purposes.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Paijan, Lailatul Harina
author_facet	Paijan, Lailatul Harina
author_sort	Paijan, Lailatul Harina
title	The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
title_short	The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
title_full	The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
title_fullStr	The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
title_full_unstemmed	The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan
title_sort	study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / lailatul harina paijan
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Mechanical Engineering
publishDate	2014
url	https://ir.uitm.edu.my/id/eprint/13994/1/13994.pdf
_version_	1783733191323942912

The study of structural development of expanded austenite on duplex stainless steel by low temperature thermochemical nitriding process / Lailatul Harina Paijan

Similar Items