Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels

Abstract:

In this work, the gigacycle fatigue response of several tool steel grades has been studied using an ultrasonic resonance testing device. It showed that both with ingot metallurgy (IM) and powder metallurgy (PM) tool steels, a true fatigue limit does not exist up to 10E10 cycles. PM steels resulted in significantly higher endurance strength levels than IM grades. However, there was virtually no effect of the composition and hardness of the materials, both for PM and IM grades cold work tool steels and high speed steels exhibiting virtually the same S-N curves. In the IM tool steel grades, crack initiation started at large primary carbides or carbide clusters, while in the PM grades, nonmetallic inclusions were the critical sites. In any case it is very important to avoid introducing residual stresses into the specimen surfaces during preparation, which would markedly shift the endurance strength levels.

• Periodical: Materials Science Forum (Volume 672)
• Pages: 23-30
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.672.23
• Online since: January 2011
• Authors: Herbert Danninger, Christian Sohar, Christian Gierl Mayer, Agnieszka Betzwar-Kotas, Brigitte Weiss
• Keywords: Crack Initiation, Gigacycle Fatigue, Tool Steel

References

[1] R. Danzer: Proc. 12th Plansee-Seminar, H. Bildstein, H.M. Ortner eds., Reutte (1989) Vol. 2.

[2] C. Tornberg: Metal Powder Report 60 (2005) p.36.

[3] S. Marsoner et al.: HTM 57 (2002) p.283.

[4] R. Stickler, B. Weiss, J. Femböck: Proc. 12th Plansee Seminar, H. Bildstein, H.M. Ortner eds., Reutte (1989) Vol. 1, p.749.

[5] B. Weiss, H. Danninger: Proc. 2000 Powder Metall. World Congress, Kyoto, K. Kosuge, H. Nagai eds., The Japan Soc. of Powder and Powder Metall. (2001) Part II, pp.1590-1593.

[6] Y. Furuya et al.: Met. Mat. Trans. 34A (2003) p.2517.

[7] H. Mughrabi: Fatigue Fract. Engng. Mater. Struct. 25 (2002) p.755.

[8] G. Roberts, G. Krauss, R. Kennedy: Tool Steels. ASM, Materials Park OH (1998).

[9] C. Sohar et al.: Kovove Materialy 46 (2008) p.197.

[10] C. Sohar et al.: Mat. -wiss. u. Werkstofftech. 2008, 39, p.248.

[11] R. Stickler, B. Weiss, in: Ultrasonic Fatigue, TMS-AIME, Warrendale PA (1982) 135.

[12] C. Sohar et al.: Int. J. Fatigue 30 (2008) p.1137.

[13] C.M. Sonsino: Konstruktion 2005 No. 4, p.87.

[14] Y. Murakami et al.: Fatigue Fract. Engng. Mater. Struct. 25 (2002) p.735.

[15] H. Berns, W. Trojahn: VDI-Z 1985, 127 (22) p.889.

[16] C. Sohar et al.: Int. J. Fatigue 30 (2008) p.2191.

[17] K. Shiozawa et al.: Fract. Eng. Mater. Struct. 28 (2006) p.1521.