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Microstructure and Tensile Properties of Hadfield Steel Produced By MIM

  • : Cazzolli, M1
  • : 1University of Trento
  • : PDF Download
  • : 2012

Abstract

In the present work the production of a Hadfield steel by MIM was studied. The main elements in the powder are: 13,4% Mn, 1,3% C, 1,0% Si and Fe to balance. A feedstock with a proprietary binder was used ( 35 % vol) , samples were produced injecting the molten feedstock at a temperature of 190�C into the die thermostabilized at 50�C using a pressure of 1100 bar. A first debinding step took place in water for 10h in order to remove part of the binder followed by a thermal debinding at 600�C for 1h, sintering was carried out in the range between 1250�C and 1300�C, followed by heat treatment (30 min. at 1000�C, cooling rate 5�C/s). The density of the different samples was measured and microstructure was analyzed to evaluate its effects on tensile properties. An important characteristic of this steel is the high strain hardening of the stable austenite. Tensile strength and elongation are comparable to those of the cast steel, even in presence of some residual porosity, highlighting MIM as a good technique to produce Hadfield steel components. Optimal tensile properties are achieved only after heat treatment eliminating the presence of precipitates along the grain boundaries.
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