Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure

X. Deng, G. B. Piotrowski, Nikhilesh Chawla, K. S. Narasimhan, M. Marucci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The fatigue crack growth behavior of powder metallurgy steels (P/M steels) is strongly affected by the nature of porosity and microstructure of steel matrix. Our previous work has focused on a premix P/M steel prepared from Fe-0.85Mo prealloy mixed and binder-treated with 2%Ni and 0.6% graphite. In this study, we have studied the fatigue crack growth behavior of a prealloy steel of similar composition. Use of the prealloy powder resulted in more homogenous microstructure than the premix steel. The alloys were tested at three different densities: 7.0 g/cm3, 7.3 g/cm3, and 7.5 g/cm3. Microstructure characterization was conducted by optical and scanning electron microscopy (SEM). Fatigue testing was performed at various R-ratios, ranging from -2 to 0.8. Prealloy steels had a higher fatigue resistance than premix steels. Increasing porosity and increasing R-ratio resulted in a decrease in ΔKth. The degree of crack closure was measured for both premix and prealloy steels at different R-ratios, and is discussed.

Original languageEnglish (US)
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005
Pages111-124
Number of pages14
StatePublished - Dec 1 2005
Event2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005 - Montreal, QC, Canada
Duration: Jun 19 2005Jun 23 2005

Publication series

NameAdvances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005

Other

Other2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005
CountryCanada
CityMontreal, QC
Period6/19/056/23/05

ASJC Scopus subject areas

  • Metals and Alloys
  • Surfaces and Interfaces

Fingerprint Dive into the research topics of 'Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure'. Together they form a unique fingerprint.

  • Cite this

    Deng, X., Piotrowski, G. B., Chawla, N., Narasimhan, K. S., & Marucci, M. (2005). Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure. In Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005 (pp. 111-124). (Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005).