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Variation of High Temperature Gas Nitriding Time on Duplex Stainless Steels

Abdul Rashid, Nurlianah (2011) Variation of High Temperature Gas Nitriding Time on Duplex Stainless Steels. Universiti Teknologi Petronas. (Unpublished)

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Abstract

This report presents the discussion on solution nitriding of duplex stainless steel. It consists of project's background, literature review, methodology, and all the relevant process and component related to this project. Nitriding is a surface-hardening heat treatment which introduces nitrogen into the surface of the duplex stainless steels at certain temperature range. The objectives of this project are to investigate the hardness and the changes on the surface microstructure of nitrided duplex stainless steel. During nitriding sample will exposed to a constant high temperature at 11 00°C with varying the time which is at lh, 2.5 h, 4.5h and 6 h. Metallographic study, XRD examination and assessment of the sample's hardness will be performed to examine the hardness of the treated sample. Scanning Electron Micrograph (SEM) and optical microscope will be used to do an assessment of the microstructure of the sample before nitriding and after nitriding process to be conducted. Weight of the nitrided sample at constant temperature 11 00°C are increasing as the nitriding time increase. The microstructure observed for the nitrided sample shows that the grain course of austenite phases are increasing as longer time nitriding were conducted as compared to ferrite phases. It shows that austenite phases react more in nitrogen diffusion compared to ferrite. Highest value of hardness: 448.2HV is achieved from sample nitrided at 1100 oc for 6 hours. Diffusion of nitrogen content leads to higher hardness. XRD analysis also shows that the appearance of FeN increase the hardness of the material. Hence as a conclusion, the objectives of the project are achieved successfully. High Temperature Gas Nitriding at ll00°C has successfully improved the hardness of the material due to more nitrogen diffused in it.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Materials - Corrosion engineering - Corrosion of metals
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:41
URI: http://utpedia.utp.edu.my/id/eprint/8781

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