The effect of boron-pack refreshment on the boriding of mild steel by the spark plasma sintering (SPS) process |
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Authors: | X.J. Chen K.A. Khor |
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Affiliation: | a School of Mechanical and Aerospace Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore b International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur (PO), R.R. District, Hyderabad 500 005, India |
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Abstract: | Mild steel samples were borided with and without boron pack refreshment using the spark plasma sintering (SPS) process. Results show that the borided samples with boron pack refreshment developed a thicker boride layer compared to that without boron pack refreshment for the same boriding duration. When boriding duration is t < 120 min, the boriding growth in the samples borided with boron pack refreshment followed a parabolic growth pattern. In contrast, the boride growth in samples processed without boron-pack refreshment deviates from parabolic at t = 60 min. Computer simulation shows that the boron concentration change in the boriding media during the boriding process is an important factor affecting the composition and final thickness of the boride layer. |
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Keywords: | Spark plasma sintering (SPS) Boriding Growth kinetics Non-steady-state diffusion Microhardness |
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