Study The Properties Of MgAZ91D After The Gas Nitriding Process

Ling, Jia Xin (2016) Study The Properties Of MgAZ91D After The Gas Nitriding Process. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In this study, gas nitriding is another alternative technique of surface treatment process in order to improve the surface properties of MgAZ91D. In the gas nitriding process, temperature and time are two main parameters that will affect the properties of nitrided MgAZ91D due to its major contribution on the surface hardness properties. However, most reported work is limited to the evaluation of nitrided MgAZ91D and its surface finish obtained. Therefore, this study is conducted to investigate the influence of these parameters on the surface properties of the nitrided MgAZ91D and also to identify the most suitable gas nitriding process temperature and time. The proposed nitriding process temperatures in this study are 350oC and 450oC with the process time of 2 hours, 4 hours and 6 hours respectively. After the gas nitriding process, the surface property analysis, such as microstructure analysis, surface roughness analysis and hardness test is conducted to compare the difference between the reference sample surface and the nitrided sample's surface. The microstructure analysis performed by using the optical microscope and SEM techniques to observe the microstructure changes of the samples, roughness test conducted to measure the texture formed on the surface of the nitride samples and the hardness test performed using Vickers hardness tester to define the surface hardness property of the samples. The results show that the surface properties of MgAZ91D are improved after the gas nitriding process. The surface roughness and hardness values of the nitrided MgAZ91D are observed increased after the nitriding process. Moreover, the strength of MgAZ91D also increased due to the grain size of microstructure increased.

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