TY - GEN
T1 - Fatigue crack growth of prealloy Fe-0.85Mo-2Ni-0.6C steels with a homogeneous microstructure
AU - Deng, X.
AU - Piotrowski, G. B.
AU - Chawla, Nikhilesh
AU - Narasimhan, K. S.
AU - Marucci, M.
PY - 2005/12/1
Y1 - 2005/12/1
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.
AB - 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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M3 - Conference contribution
AN - SCOPUS:84883317457
SN - 0976205726
SN - 9780976205722
T3 - Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005
SP - 111
EP - 124
BT - Advances in Powder Metallurgy and Particulate Materials - 2005, Proceedings of the 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005
T2 - 2005 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2005
Y2 - 19 June 2005 through 23 June 2005
ER -