Fatigue Crack Propagation Behavior in Low Temperature Range

Hasegawa, Mitsuhiko; Kodama, Shotaro; Kawada, Yuichi

doi:10.1299/kikai1938.43.2003

Cited by 1 publication

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“…(1 1 where rn and C are material constants. The values of rn and C in equation (1) have been found to be dependent on microstructure and the fracture mechanism [4,5,6] but minimally sensitive to a decrease of test temperature [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

THE INFLUENCE OF TEST TEMPERATURE ON IMPACT FATIGUE CRACK GROWTH BEHAVIOR IN QUENCHED AND TEMPERED Cr-Mo ALLOY STEELS WITH DIFFERENT PRIOR AUSTENITE GRAIN SIZES

Murakami

Akizono

1980

Fat Frac Eng Mat Struct

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Impact fatigue tests were carried out using a rotating-disk type impact fatigue testing machine. The influence of prior austenite grain size, ductile-brittle transition temperature and test temperature on impact fatigue crack growth rate was investigated by means of fracture mechanics and fractography in quenched and tempered Cr-Mo alloy steel in which the prior austenite grain size was varied from 8.3 to 25.4 Vm. The results in impact fatigue tests were compared to those under non-impact conditions. The crack growth rates associated with striation formation were insensitive to the change in prior austenite grain size, ductile-brittle transition temperature and test temperature regardless of impact and non-impact fatigue. When the material was in the brittle condition, impact fatigue gave rise to a transition from striation formation to intergranular and cleavage cracking. Such a transition will result in the acceleration of crack growth rate. The Paris Law exponent values in impact fatigue were reasonably expressed by the ratio of test temperature to ductile-brittle transition temperature.

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