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 Citations (Scopus)

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 - 2005
Event2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005 - Montreal, QC, Canada
Duration: Jun 19 2005Jun 23 2005

Other

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

Fingerprint

Steel
Fatigue crack propagation
cracks
steels
microstructure
Microstructure
Steel powder metallurgy
powder metallurgy
Porosity
Crack closure
Fatigue testing
Graphite
crack closure
porosity
Powders
Binders
Fatigue of materials
Scanning electron microscopy
graphite
Chemical analysis

ASJC Scopus subject areas

  • Metals and Alloys
  • Surfaces and Interfaces

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)

Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure. / Deng, X.; Piotrowski, G. B.; Chawla, Nikhilesh; Narasimhan, K. S.; Marucci, M.

Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005. 2005. p. 111-124.

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

Deng, X, Piotrowski, GB, Chawla, N, Narasimhan, KS & 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, 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005, Montreal, QC, Canada, 6/19/05.
Deng X, Piotrowski GB, Chawla N, Narasimhan KS, Marucci M. 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. 2005. p. 111-124
Deng, X. ; Piotrowski, G. B. ; Chawla, Nikhilesh ; Narasimhan, K. S. ; Marucci, M. / Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure. Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005. 2005. pp. 111-124
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AU - Narasimhan, K. S.

AU - Marucci, M.

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N2 - 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.

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