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Metals 2017, 7(3), 81; doi:10.3390/met7030081

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

1
Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
2
School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
3
Materials Chemistry, RWTH Aachen University, D-52056 Aachen, Germany
4
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China
5
School of Engineering and Advanced Technology, Massey University, Private Bag 102904, Auckland 0745, New Zealand
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 18 December 2016 / Revised: 20 February 2017 / Accepted: 28 February 2017 / Published: 3 March 2017
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Abstract

This work investigated the isothermal holding time dependence of the densification, microstructure, weight loss, and tensile properties of Fe-Mn-Si powder compacts. Elemental Fe, Mn, and Si powder mixtures with a nominal composition of Fe-28Mn-3Si (in weight percent) were ball milled for 5 h and subsequently pressed under a uniaxial pressure of 400 MPa. The compacted Fe-Mn-Si powder mixtures were sintered at 1200 °C for 0, 1, 2, and 3 h, respectively. In general, the density, weight loss, and tensile properties increased with the increase of the isothermal holding time. A significant increase in density, weight loss, and tensile properties occurred in the compacts being isothermally held for 1 h, as compared to those with no isothermal holding. However, further extension of the isothermal holding time (2 and 3 h) only played a limited role in promoting the sintered density and tensile properties. The weight loss of the sintered compacts was mainly caused by the sublimation of Mn in the Mn depletion region on the surface layer of the sintered Fe-Mn-Si compacts. The length of the Mn depletion region increased with the isothermal holding time. A single α-Fe phase was detected on the surface of all of the sintered compacts, and the locations beyond the Mn depletion region were comprised of a dual dominant γ-austenite and minor ε-martensite. View Full-Text
Keywords: Fe-Mn-Si alloy; isothermal holding time; powder sintering; density; weight loss; tensile properties Fe-Mn-Si alloy; isothermal holding time; powder sintering; density; weight loss; tensile properties
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Xu, Z.; Hodgson, M.A.; Chang, K.; Chen, G.; Yuan, X.; Cao, P. Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy. Metals 2017, 7, 81.

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