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Open AccessArticle

Optimization of Sintering Parameters of 316L Stainless Steel for In-Situ Nitrogen Absorption and Surface Nitriding Using Response Surface Methodology

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School of Mechanical & Manufacturing Engineering, National University of Sciences and Technology (NUST), H-12, Islamabad 44000, Pakistan
2
Mechanical Engineering Department, Universiti Teknologi PETRONAS (UTP), Seri Iskandar 32610, Malaysia
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Department of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Khyber Pakhtunkhwa 19201, Pakistan
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Centre of Excellence in Science & Applied Technologies, Islamabad 44000, Pakistan
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Mechanical Engineering Department, Universitas PERTAMINA, Jakarta 12220, Indonesia
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Manufacturing Section, Universiti Kuala Lumpur Malaysian Spanish Institute, Kulim Hi-Tech Park, Kedah 09000, Malaysia
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Mechanical Engineering Department, Bayero University Kano, Kano 700241, Nigeria
*
Authors to whom correspondence should be addressed.
Processes 2020, 8(3), 297; https://doi.org/10.3390/pr8030297
Received: 11 January 2020 / Revised: 25 February 2020 / Accepted: 25 February 2020 / Published: 5 March 2020
(This article belongs to the Special Issue Synthesis and Characterization of Biomedical Materials)
This research investigates the simultaneous sintering and surface nitriding of 316L stainless steel alloy using powder metallurgy method. The influence of sintering temperature and dwell time are investigated for maximum nitrogen absorption, densification and increased microhardness using response surface methodology (RSM). In this study, 316L stainless steel powder was compacted at 800 MPa and sintered at two different temperatures of 1150 and 1200 °C with varying dwell times of 1, 3, 5 and 8 h in nitrogen atmosphere. The sintered compacts were then characterized for their microstructure, densification, microhardness and nitrogen absorption. The results revealed that increased dwell time assisted nitrogen to diffuse into stainless steel matrix along with the creation of nitride layer onto the sample surface. The microhardness and density also increased with increasing dwell time. A densification of 7.575 g/cm3 and microhardness of 235 HV were obtained for the samples sintered at 1200 °C temperature with 8 h dwell time. The simultaneous sintering and surface nitriding technique developed in this research work can help in improving corrosion resistance of this material and controlling leaching of metal ions for its potential use in biomedical applications. View Full-Text
Keywords: 316L stainless steel; sintering; surface nitriding; nitrogen absorption; response surface methodology 316L stainless steel; sintering; surface nitriding; nitrogen absorption; response surface methodology
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Ali, S.; Abdul Rani, A.M.; Ahmad Mufti, R.; Ahmed, S.W.; Baig, Z.; Hastuty, S.; Razak, M.A.A.; Abdu Aliyu, A.A. Optimization of Sintering Parameters of 316L Stainless Steel for In-Situ Nitrogen Absorption and Surface Nitriding Using Response Surface Methodology. Processes 2020, 8, 297.

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