A Re-Examination of the Toughness and Fatigue Performance of PM Steels

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It is now fairly well established that to achieve low values of the Paris exponent for the growth of fatigue cracks in PM steels, high values of fracture toughness are required. Fracture toughness is related to other measures of toughness, such as impact tests and the mechanical work that the material can absorb before fracturing. All of these are functions of the basic ductility of the material. A coherent picture of all these inter-relationships is presented.

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Edited by:

Ionel Chicinaş and Traian Canta

Pages:

47-50

Citation:

J.R. Moon, "A Re-Examination of the Toughness and Fatigue Performance of PM Steels", Advanced Materials Research, Vol. 23, pp. 47-50, 2007

Online since:

October 2007

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[1] J.R. Moon: Powder Metallurgy Progress, Vol. 2 (2002), p.63.

[2] J.R. Moon: Powder Metallurgy Progress, Vol. 4 (2005), p.204.

[3] J.R. Moon, in: Deformation and fracture of structural PM materials, edited by L. Parilak.

[4] H. Danninger, Slovak Academy of Sciences in Kosice, Vol 1 (2002), p.13.

[5] R.A. Phillips, J.E. King and J.R. Moon, Powder Metallurgy, Vol. 43 (2000), p.43.

[6] R.A. Phillips, J.E. King and J.R. Moon, Powder Metallurgy, Vol. 43 (2000), p.149.

[5] [10] [15] [20] 0 10 20 30 40 50 Crack extension energy, G/kJm -2 C = 0. 2% C= 0. 5 or 0. 6% Fatigue crack growth exponent, m.

[5] [10] [15] [20] 0 50 100 150 200 Strain energy density to fracture/MJm -3 C = 0. 2% C = 0. 5 or 0. 6% Fatigue crack growth exponent, m.

[5] [10] [15] [20] 0 10 20 30 Elongation to fracture/% C = 0. 2% C = 0. 5 or 0. 6% Fatigue crack growth exponent, m.

[5] [10] [15] [20] 0 20 40 60 80 100 C = 0. 2% C = 0. 5 or 0. 6% Fatigue crack growth exponent, m KQ/MPa√m.