Effects of boronizing on sharp cornered metal surface

Ab Halim, Nabilah (2017) Effects of boronizing on sharp cornered metal surface. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Boronizing is a thermochemical process usually used to harden the material. Based on published previous researches, boronizing process was studied but only focusing on the hardening of the material. This study is focusing on the boronizing process on the cornered of the metal surface. In this study, the sharp cornered surface will be studied in order to know which part of the geometries that shows the most effective boronizing process by using two parameters that are temperature and time. The parameters are 850oC - 950oC (1123K – 1223K) for 2, 4 and 6 hours. Besides that, this study is to analyse the effect of different cornered geometries by using the activation energy. There are four different geometries at each corner of the metal specimen that are 90o, 1mm fillet, 5mm radius, and chamfer. The specimens need to be designed and fabricated with the dimension of 20mm X 20mm X 20 mm to suit into the existing container. After the boronizing process has been done, metallographic analyses were used to determine the boride layer thickness. From the boride layer thickness, the activation can be calculated and the geometry with lowest activation energy is the best shape and the boron is easy to diffuse. As the conclusion, the 90o geometry has the lowest activation energy with value of 61.785 kJ/mol.

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