Effect of Vanadium and Carbon Content on the Sinterability of Water Atomised High Speed Steel Powders

Abstract:

This paper presents the results of an investigation into the sintering behaviour of three vanadium enriched variants of T42 high-speed steel. Powders were prepared by water atomization with vanadium and carbon contents of 6-8 wt% and 2.2 -2.7 wt%, respectively. These were annealed, die pressed and sintered in vacuum. All three alloys were sintered to full density giving “as –sintered” microstructures comprising globular MC carbides dispersed in a martensitic matrix. Optimum sintering temperatures were in the range 1240 - 1250°C with lower optimum temperatures associated with higher carbon levels. Sintering characteristics are correlated with phase diagrams calculated using ThermoCalc™ software and TCFe2000 database. The implications for the design of sinterable vanadium containing high-speed steels are discussed.

• Periodical: Materials Science Forum (Volumes 514-516)
• Pages: 529-533
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.514-516.529
• Online since: May 2006
• Authors: João M.G. Mascarenhas, Manuela Oliveira, C. Steven Wright
• Keywords: Microstructure, Phase Diagram, Sintering Behaviour

References

[1] C.S. Wright, Role of Molybdenum in Promoting Densification During Vacuum Sintering of T1 Grade High Speed Steel Powders, Powder Metallurgy, 32(2), 1989, 114-117.

DOI: 10.1179/pom.1989.32.2.114

[2] Randall M. German, Powder Metallurgy Science, Metal Powder Industries Fed., (1984).

[3] Yixiong Liu, Rajiv Tandon and Randall M. German, Modelling of Supersolidus Liquid Phase Sintering: I. Capillary Force, Metallurgical and Materials Transactions, 26A, (1995).

DOI: 10.1007/bf02671255

[4] Yixiong Liu, Rajiv Tandon and Randall M. German, Modelling of Supersolidus Liquid Phase Sintering: II. Densification, Metallurgical and Materials Transactions, 26A, (1995).

DOI: 10.1007/bf02671256

[5] M.M. Oliveira, J. Mascarenhas and A.S. Wronski, Supersolidus Sintering and Mechanical Properties of Water Atomised Fe-2. 3C-4. 0Cr-7. 0Mo-10. 5Co-6. 5V-6. 5W High Speed Steel, Powder Metallurgy, 36 (4), 1993, 281-287.

DOI: 10.1179/pom.1993.36.4.281

[6] M.M. Oliveira, O. Sousa Ribeiro, A.S. Wronski, Processing of a High-Alloy High-Speed Steel Via Water Atomisation and Direct Sintering, PMI, 25, (5), 1993, 215-218.

[7] C.S. Wright and B. Ogel, Supersolidus Sintering of High Speed Steels, Part I: Sintering of Molybdenum Based Alloys, Powder Metallurgy, 36 (3), 1993, 213-219.

DOI: 10.1179/pom.1993.36.3.213

[8] C.S. Wright, B. Ogel, F. Lemoisson and Y. Bienvenu, Supersolidus Sintering of High Speed Steels Part 2 : Sintering of Tungsten Based Alloys, Powder Metallurgy, 1995, 221-229.

DOI: 10.1179/pom.1995.38.3.221

[9] C.S. Wright, A.S. Wronski, M. Durand-Charre, I. Ansara, Y. Bienvenu, F. Lemoisson, M.M. Oliveira and J. Mascarenhas, Supersolidus Sintering of High Speed Steels - The Computer Aided Design of Highly Sinterable Alloys, Proc. PM'94, Paris, 1994, 1517-1520.

DOI: 10.1179/003258999665486

[10] R.M. German, A Quantitative Theory for Supersolidus Liquid Phase Sintering, Powder Metallurgy, 34(2), 1991, 101-107.

DOI: 10.1179/pom.1991.34.2.101

[11] Shigeaki Takajo and Minoru Nitta, Observation of Liquid Phase Sintering of a High Speed Steel Powder, Sintering '85, Plenum Press, 1987, 189-196.

DOI: 10.1007/978-1-4613-2851-3_19

[12] (117)- J.A. Lund and S.R. Bala, Supersolidus Sintering, Modern Developments in Powders Metallurgy, 6, 1974, 409-421.