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Microwave-Assisted Hybrid Sintering of 316L Powder Compacts: Microstructure, Mechanical, and Electrochemical Properties

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Abstract

The present study investigates the effect of microwave hybrid heating on the densification, microstructure, mechanical and electrochemical responses of 316L powder compacts at various sintering conditions (solidus and super-solidus). The sintering, mechanical and electrochemical properties are correlated with the microstructural attributes (pore morphologies) and densification characteristics. The microwave hybrid heating of samples at the super-solidus (1300 ºC) region has resulted in more cumulative atomic diffusions. It provides pore filling capabilities that reduce the pore count, thereby enhanced the density (90 ± 1.5%). The tuning of pore morphologies for the samples sintered at 1300 ºC for 60 min has resulted in the higher tensile strength of 457 ± 5.3 MPa with 23 ± 1.4% ductility. It is also observed that an increase in sintering temperature results in higher corrosion resistance in the order of ten times. The passive oxide film resistance (Rox) and charge transfer resistance (Rct) derived from EIS measurements have shown eight and twelve times higher values for the samples sintered at 1300 ºC for 60 min than 1200 ºC for 30 min samples.

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Authors and Affiliations

  1. Green Energy Materials and Manufacturing Research Group, Department of Metallurgical and Materials Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, 620015, India

    Kasagani Veera Venkata Nagaraju

  2. Department of Metallurgical and Materials Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, 620015, India

    Sinnaeruvadi Kumaran & Tiyya Srinivasa Rao

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  1. Kasagani Veera Venkata Nagaraju
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Nagaraju, K.V.V., Kumaran, S. & Rao, T.S. Microwave-Assisted Hybrid Sintering of 316L Powder Compacts: Microstructure, Mechanical, and Electrochemical Properties. J. of Materi Eng and Perform 31, 9555–9572 (2022). https://doi.org/10.1007/s11665-022-06948-5

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