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Transactions of the Indian Institute of Metals

, Volume 72, Issue 10, pp 2819–2826 | Cite as

Effect of Cr Contents on the Porosity Percentage, Microstructure, and Mechanical Properties of Steel Foams Manufactured by Powder Metallurgy

  • Hamid SazegaranEmail author
  • Abolfazl Feizi
  • Milad Hojati
Technical Paper
  • 51 Downloads

Abstract

In this work, the effect of Cr content (0, 1, 2, 3, and 4 wt%) on the porosity percentage, cell walls microstructure, and mechanical behavior of the steel foams containing 0.6 wt% C, 1.5 wt% Cu, and 2 wt% P manufactured by powder metallurgy using leachable space holder technique was investigated. The microstructure of the cell walls was evaluated by optical microscopy (OM) and scanning electron microscopy (SEM). The mechanical behavior of the manufactured foams was studied by compression and hardness tests. The porosity values of the steel foams were between 72 and 76%, and increase in Cr content (from 0 to 4 wt%) did not have significant effect on the porosity. The results revealed that the microstructure of cell walls comprised of copper islands, intergranular carbides, phosphorus phases, and pearlite. The liquid phase sintering (LPS), solution strengthening by Cr, and the formation of intergranular carbides lead to improve the mechanical behavior of steel foams. The elastic region, long sawtooth plateau region, and fracture point are manifestly observed in the compressional stress versus strain curves. By increasing the Cr content, the plateau stress (from 41.7 to 153.2 MPa), the fracture point stress (from 42.3 to 182.4 MPa), and the elasticity modulus (from 1.23 to 3.73 GPa) increase.

Keywords

Cr content Steel foam Porosity Compressional behavior Sawtooth plateau 

Notes

Acknowledgements

This work research was sponsored by Quchan University of Technology under Contract No. 96/8428. The authors would like to thank the Financial Deputy of Quchan University of Technology.

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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Industrial Engineering Department, Faculty of EngineeringQuchan University of TechnologyQuchanIran
  2. 2.Institute of Chemical Technologies and Analytics, Vienna University of TechnologyViennaAustria

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