Rolling Contact Fatigue of Hot-Forged Steels out of Prealloyed Powders and Powder Blend

Abstract:

Powder forging is used for heavy-loaded parts (rings of rolling-contact bearings, gears etc.) production. Rolling contact fatigue is material property values of which characterize possibility of practical utilization of such parts. Rolling contact fatigue of some steels obtained out of prealloyed powders Astaloy CrM, Atomet 4601, Atomet 4901 and powder blends iron-carbon-nickel by hot forging is studied in the present paper. Effect of various kinds of heat and thermomechanical treatment on rolling contact fatigue is determined. Thermomechanical treatment provides optimal values of rolling contact fatigue. In this case steel structure contains up to 40% of retained metastable austenite which is transformed to martensite on trials. Thus typically crack is generated on residual pores and non-metallic inclusions instead of martensite zones in wrought steels.

• Periodical: Materials Science Forum (Volumes 534-536)
• Pages: 709-712
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.534-536.709
• Online since: January 2007
• Authors: Vladimir Dorofeyev, Anna Sviridova
• Keywords: Blended Powder Steels, Powder Forging, Powder Mixture, Rolling Contact Fatigue (RCF), Thermomechanical Treatment (TMT)

References

[1] Information on CD: Rolling Contact Fatigue. Final Test Report: Center for Powder Metallurgy Technology.

[2] F. Hanejko, A. Rawlings and R. Slattery: Surface Densification Approach to High Density Gears (Euro PM2004: Conference Proceedings, volume 2, edited by H. Danninger and R. Ratzi, p.407).

[3] F. Hanejko, A. Rawlings and KSV Narasimhan: Surface Densified PM Steel - Comparison with Wrought Steel Grades (EURO PM2005: Congress & Exhibition Proceedings, volume 1, p.509).

[4] Yu.G. Dorofeyev, B.G. Gasanov, V. Yu. Dorofeyev, V.N. Mischenko and V.I. Miroshnikov: Industrial Hot Forging Technology of Powder Articles (Metallurgiya, Moscow, Russia 1990, p.206, in Russian).

[5] V. Dorofeyev and Y. Pirozhkova: The Peculiarities of Heat Treatment of Hot-Forged Molybdenum and Nickel-Molybdenum Steels out of Prealloyed Powders (EURO PM2005: Congress & Exhibition Proceedings, volume 3, p.103).

[6] Y. Pirozhkova and V. Dorofeyev: Structure and Properties of Heterogeneous Powder Nickel Steels after Hot Forging and Varied Heat Treatment Techniques (EURO PM2005: Congress & Exhibition Proceedings, volume 3, p.109).

[7] H. Kuhn and B. Ferguson: Powder Forging (Metal Powder Industries Federation, Princeton, New Jersey, USA, p.241).