Microstructure and Mechanical Properties of Metal Powder Treated AISI-430 FSS Welds

M.O.H. Amuda, F.T. Lawal, M. A. Onitiri, E. T. Akinlabi and S. Mridha
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M.O.H. Amuda: Modern and Advanced Manufacturing Systems Research Group, Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa & Materials Development and Processing Research Group, Department of Metallurgical and Materials Engineering, University of Lagos, Lagos, Nigeria
F.T. Lawal: Materials Development and Processing Research Group, Department of Metallurgical and Materials Engineering, University of Lagos, Lagos, Nigeria
M. A. Onitiri: Modern and Advanced Manufacturing Systems Research Group, Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
E. T. Akinlabi: Modern and Advanced Manufacturing Systems Research Group, Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
S. Mridha: Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow, UK

International Journal of Manufacturing, Materials, and Mechanical Engineering (IJMMME), 2018, vol. 8, issue 4, 63-83

Abstract: An innovative yet simple technique for the inoculation of the weld pool of commercial AISI 430 Ferritic Stainless Steel (FSS) with metal powders for grain refinement is discussed. Aluminum or titanium powder in varying amounts introduced into the weld pool via a powder preplacement technique was melted under a tungsten inert gas (TIG) torch. This strategy of inoculating the welds offers dual benefits of grain refinement and constriction in the weld geometry. The addition of the metal powders constricts the HAZ by as much as 50% of the conventional weld providing a grain refinement index (GRI) of about 0.8 in titanium powder treated welds. It equally emerged that weld property is not influenced by the grain size alone but equally by the amount of delta ferrite in the microstructure.

Date: 2018
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