Paper Titles

Lengthening Kinetics of Pro-Eutectoid Ferrite Ledge in Fe-C Alloy under Interface-Diffusion Mixed Control Mode
p.1134

3D Cellular Automata Modelling of Solid–state Transformations Relevant in Low–alloy Steel Production
p.1140

Stochastic Statistical Theory of Precipitation in Metastable Alloys with Application to Fe-Cu and Fe-Cu-Mn Alloy Systems
p.1146

Diffusion under a Stress in Metals and Interstitial Alloys
p.1156

Thermodynamic Aspects of Liquid Phase Sintering B-Containing P/M Stainless Steels
p.1164

Thermodynamic Modelling of Carbide Precipitation in Hot Work Tool Steels with Different Silicon Contents
p.1171

Modeling of Growth and Dissolution of Grain Boundary Cementite in Vacuum Carburizing Process
p.1177

Critical Assessment of Bainite Models for Advanced High Strength Steels
p.1183

A Simple Model of Dissipative Processes in Ferroelastics
p.1189

HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Thermodynamic Aspects of Liquid Phase Sintering...

Thermodynamic Aspects of Liquid Phase Sintering B-Containing P/M Stainless Steels

Article Preview

Abstract:

Being an effective sintering enhancer boron is gaining relevance for obtaining high density PM steels. Thermodynamic calculations are an important tool for studying the roll of alloying elements in the formation of a liquid during sintering. In the present work, the system Fe-Cr-B was obtained by combining up to date thermodynamic descriptions for the subsystems Fe-Cr, Cr-B and B-Cr. The calculations were carried out with Thermo-Calc software to predict isothermal sections for the ternary diagram for 1210 and 1250°C. The analysis of the isothermal sections indicates that the solid phases in equilibrium with the liquid are M₂B and a-BCC solid solution. The generation of the liquid is based on a eutectic reaction (Lða+(FeCr)₂B) involving the mixed borides previously formed. On the other hand, simulations for PM steels with constant boron but higher chromium content allowed realising that the formation of the liquid may be completely inhibited, within the temperature range under consideration, as materials with too high Cr/Fe ratios are used. This study was also supported by selected experiments which were in excellent agreement with the thermodynamic calculations.

You might also be interested in these eBooks

Solid-Solid Phase Transformations in Inorganic Materials

Info:

Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

1164-1170

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.1164

Citation:

Cite this paper

Online since:

June 2011

Authors:

J. Carlos Rodriguez, Lorena Lozada, Concepción Tojal, T. Gómez-Acebo, F. Castro

Keywords:

Boride, Fe-Cr-B System, High-Density, ThermoCalc

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2011 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] H. S. Nayar, B. Wasiczko, Metal Powder Report 45, 611 (1990).

[2] M. C. Baran, A. E. Segall, B. A. Shaw, H. M. Kopech, T. E. Haberberger, Adv. in Powder Met. and Particulate Materials, Chicago IL 1997, 1, 37-42.

[3] K. T. Kim, Y. C. Jeon, Materials Science and Engineering A 245, 64 (1998).

[4] J. M. Capus, Advanced Materials and Processes 158, 57 (2000).

[5] P. K. Samal, Key Engineering Materials 189-191, 328 (2001).

[6] R. M. German, K. A. D'Angelo, Int. Met. Rev. 29, 249 (1984).

[7] M. Sarasola, T. Gómez-Acebo, F. Castro, Acta Mat., 52, 4615 (2004).

[8] K. Koichu, N. Mitsuru, H. Hiroshi, Funtai Oyobi Fummatsu Yakin/J. of the Jpn. Soc. of Powder and Powder Met. 47, 1091 (2000).

[9] K. S. Narasimhan, Materials Chemistry and Physics 67, 56 (2001).

[10] D. S. Madan, The Int. J. of Powder Met. 27, 339 (1991).

[11] P.E. Busy, M. E. Warga, C. Wells, J. of Metals Trans. AIME Nov., 1463 (1953).

[12] B. Hallemans, P. Wollants, J. R. Roos, Z. Metallkunde 85 (10), 676 (1994).

[13] S. K. Jensen, E. Maahn, World Cong. on PM, Paris 1994, 3, 2113-2116.

[14] A. Molinari, G. Straffelini, T. Pieczonka, J. Kazior, Int. J. of Powder Met. 34, 21 (1998).

[15] P. K. Samal, J. B. Terrel, Int. Conf. on Powder Met. & Particulate Materials, New York 2000, 7, 17-31.

[16] T. Pieczonka, J. Kazior, A. Tiziani, A. Molinari, J. of Mats. Proc. Technol. 64, 327 (1997).

[17] C. Schade, J. Schaberl, S. N. Thakur, V. C. Dongre, Int. Conf. on Powder Met. & Particulate Mats., Montreal (2005).

[18] L. Lozada, F. Castro, Adv. in Powder Met and Particulate Mater. 5, 129 (2008).

[19] C. Tojal, T. Gómez-Acebo, F. Castro, Materials Science Forum 534-536, 661 (2007).

DOI: 10.4028/www.scientific.net/msf.534-536.661

[20] R. M. German, The Int. J. of Powder Met and Powder Technol. 19, 277 (1983).

[21] R. Tardon, R. M. German, Int J Powder Metall 34, 40 (1998).

[22] J. Kazior, M. Nykiel, T. Pieczonka, T. Marcu Puscas, A. Molinari, Journal of Materials Processing Technology 157-158, 712 (2004).

DOI: 10.1016/j.jmatprotec.2004.07.140

[23] H. Danninger, G. Jangg, M. Giahi, Mat. -wiss. u. Werkstofftech 19, 205 (1988).

DOI: 10.1002/mawe.19880190607

[24] M. Sarasola, S. Sainz, F. Castro, Euro PM2005, Prague 2005, 1, 349-356.

[25] T. Gómez-Acebo, M. Sarasola, F. Castro, Calphad 27, 325 (2003).

[26] Y. Yang, Y. A. Chang, Intermetallics 13, 121 (2005).

[27] M. Morishita, S. K. Koyama, Yagi, G. Zhang, J. Alloys and Compounds 314, 212 (2001).

[28] V. G. Kudin, V. A. Makara, Inorganic Materials 3(3), 216 (2002).

[29] L. M. Pan, PhD thesis, Univ. of Surrey (1992).

[30] C. E. Campbell, U. R. Kattner, Calphad 26(3), 477 (2002).

[31] J. O. Anderson, B. Sundman, Calphad 11, 83 (1987).

[32] M. Hillert, C. Qui, Met. Trans 22A, 2187 (1991).

[33] H. L. Lukas, S. G. Fries, B. Sundman, Computational thermodynamics: The Calphad Method, Cambridge University Press (2007).

DOI: 10.1017/cbo9780511804137