Effect of Nitriding Temperature on Duplex Stainless Steel

This project discussed about the project titled Effect of Nitriding Temperature of
Duplex Stainless Steel. This report consisted of the project's background, objectives,
and problem statements, scope of work, literature review, methodology or the flow
of the project, result & discussion and last but not least the conclusion. In this work
the author report a study of the surface modification and hardness improvement of
duplex stainless steel (DSS) nitride by nitrogen gaseous have been conducted in a
horizontal tube furnace at four different temperatures. Nitriding is one of the
traditional thermochemical treatments for surface engineering that can be utilized in
order to harden the duplex stainless steel surface to resist any failure. In order to
conduct the nitriding process, it is crucial to highlight the important of its variables
such as time, temperature and gas veloeity. This is beeause, all these variables have
contribute each significance effect especially in terms of the nitriding process itself
and the effect of mechanical properties of the samples. However, for this project, the
author have investigated and identified the effect of utilizing variations of nitriding
temperatures in order to improve and enhance the strength and hardness of the
duplex stainless steel. Therefore, the result of before and after being nitride of the
samples have been observed for different temperatures. This objective have been
achieved by a series of laboratory tests such as metallographic study, and XRD
examination and assessment of the sample's hardness using Vickers Microhardness
Testing after the treatment were performed to examine the result of the treatment.
The sample's microstructures have been examined by using Scanning Electron
Microscopy with Energy Dispersive X-ray Spectrometry (SEM-EDX). Results of
these laboratory tests have been used to analyze both of the strength and
microstructures of the samples. The result showed that there is markedly effect of
nitriding temperatures to both strength and microstructures of samples. As the
nitriding temperature increased, the hardness of samples also increased. Last but not
least, the objectives of this work have been achieved successfully.