Microstructure and mechanical properties of two tool steels with ultrahigh boron content

Authors

  • J. A. Jiménez Centro Nacional de Investigaciones Metalúrgicas, CENIM (CSIC)
  • P. Acosta Max Planck Institut für Eisenforschung GmbH
  • G. Frommeyer Max Planck Institut für Eisenforschung GmbH
  • O. A. Ruano Centro Nacional de Investigaciones Metalúrgicas, CENIM (CSIC)

DOI:

https://doi.org/10.3989/revmetalm.1998.v34.iExtra.758

Keywords:

Ultrahigh boron steels, Tool steels, Creep

Abstract


In the present work, two selected tool steels have been modified by a boron addition of 0.5 and 1 mass %. Both steels were processed by powder metallurgy methods, including argon atomization and hot isostatic pressing. The Consolidated materials presented a microstructure consisting of a fine and homogeneous distribution borocarbides M23(C,B)6 in a ferrite-martensite matrix. No changes are observed in the microstructure after deformation by compression-strain-rate-change tests at temperatures ranging from 700 to 1,100 °C. For the Fe-lB-lC steel, a stress exponent of 4.5 was obtained, that suggests that slip creep is the controlling deformation mechanism. On the other hand, a stress exponent between 2 and 3 was obtained for the Fe-0.5B-1.5C steel that suggests that grain boundary sliding is the controlling deformation mechanism. In both cases, the activation energy for creep was related to the activation energy for iron self-diffusion.

Downloads

Download data is not yet available.

Downloads

Published

1998-05-30

How to Cite

Jiménez, J. A., Acosta, P., Frommeyer, G., & Ruano, O. A. (1998). Microstructure and mechanical properties of two tool steels with ultrahigh boron content. Revista De Metalurgia, 34(Extra), 300–304. https://doi.org/10.3989/revmetalm.1998.v34.iExtra.758

Issue

Section

Articles

Most read articles by the same author(s)

1 2 3 4 > >>