<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Elemental iron and manganese powders were blended to form mixtures containing 25, 30 and 35wt.% Mn. Mixtures were compressed into prismatic bars and sintered. Some of the bars were repressed and resintered. Compared to a bar pressed and sintered once, the bar pressed and sintered twice possessed a higher relative density, a higher bending stiffness, and a grid microindentation data set with a lower variance. Bars were immersed in Hank's solution for eight weeks. After this procedure, the bending stiffness were found reduced for all bars except for those pressed, sintered and only repressed, the bending stiffness of which remained unchanged. The repressing has most likely closed up throats connecting the clusters of pores with the free surface of a bar, reducing thus a surface area exposed to a corrosive attack. The resintering has opened up those throats, the electrolyte could fill accessible pores and corrosion weakened the near-surface material, reducing thus a bar's bending stiffness.</p></abstract>

Elemental iron and manganese powders were blended to form mixtures containing 25, 30 and 35wt.% Mn. Mixtures were compressed into prismatic bars and sintered. Some of the bars were repressed and resintered. Compared to a bar pressed and sintered once, the bar pressed and sintered twice possessed a higher relative density, a higher bending stiffness, and a grid microindentation data set with a lower variance. Bars were immersed in Hank's solution for eight weeks. After this procedure, the bending stiffness were found reduced for all bars except for those pressed, sintered and only repressed, the bending stiffness of which remained unchanged. The repressing has most likely closed up throats connecting the clusters of pores with the free surface of a bar, reducing thus a surface area exposed to a corrosive attack. The resintering has opened up those throats, the electrolyte could fill accessible pores and corrosion weakened the near-surface material, reducing thus a bar's bending stiffness.

Microstructure, Mechanical Properties and Corrosion Behaviour of Iron - Manganese PM Materials Pressed and Sintered Once and Twice

Powder Metallurgy Progress

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Elemental iron and manganese powders were blended to form mixtures containing 25, 30 and 35wt.% Mn. Mixtures were compressed into prismatic bars and sintered....

Microstructure, Mechanical Properties and Corrosion Behaviour of Iron - Manganese PM Materials Pressed and Sintered Once and Twice

Published Online: Mar 01, 2018

Page range: 112 - 123

DOI: https://doi.org/10.1515/pmp-2017-0012

Keywords
corrosion, immersion test, Fe-Mn, pressed and sintered materials, bending stiffness

© 2017 M. Kupková et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Microstructure, Mechanical Properties and Corrosion Behaviour of Iron - Manganese PM Materials Pressed and Sintered Once and Twice

Published Online: Mar 01, 2018

Page range: 112 - 123

DOI: https://doi.org/10.1515/pmp-2017-0012

Keywordscorrosion, immersion test, Fe-Mn, pressed and sintered materials, bending stiffness

© 2017 M. Kupková et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
corrosion, immersion test, Fe-Mn, pressed and sintered materials, bending stiffness