Fatigue Crack Formation Associated With Cyclic Slip Deformation Along Prior Austenite Grain Boundaries

Kunio, Takeshi; Shimizu, Masao; Yamada, Kazuo; Enomoto, M.

doi:10.1016/b978-0-08-022140-3.50017-3

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1979

1990

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The Role of Prior Austenite Grains in Fatigue Crack Initiation and Propagation in Low Carbon Martensite

Kunio

Shimizu

Yamada

et al. 1979

Fat Frac Eng Mat Struct

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Abstract-A study has been made of the role of Prior Austenite Grains (PAG) in fatigue crack initiation and propagation in low carbon martensite.The occiirrence of ferrite precipitation along prior austenite grain boundaries during rapid cooling will lead to the formation of intergranular cracking. This intergranular cracking has a close relationship with the reduction of the endurance limit for fine grained low carbon martensite.

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The Role of Prior Austenite Grains in Fatigue Crack Initiation and Propagation in Low Carbon Martensite

Kunio

Shimizu

Yamada

et al. 1979

Fat Frac Eng Mat Struct

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Keyhole Compact Tension Specimen Fatigue of Selected High-Strength Steels in Seawater

Rajpathak

Hartt

1990

Environmentally Assisted Cracking: Science and Engineering

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Fatigue experiments have been performed in flowing natural seawater on nine different steels with yield stress in the range 370 to 990 MPa (54 to 143 ksi) employing keyhole compact tension specimens. All experiments were at a frequency of 1.0 Hz and R = 0.5. Corrosion state was either freely corroding (FC) or cathodically polarized (CP) to ∼1.10 V saturated calomel electrode (SCE). Limited experiments were also performed in air. Seven of the steels represent relatively new technology where strengthening involves either (1) precipitation hardening, (2) microalloying and quenching and tempering, (3) control rolling, or (4) thermomechanical control processing (TMCP). The results are represented in a ΔK(ρ)-1/2 versus cycles to initiation format and are evaluated with regard to the effects of environment and cathodic polarization. Endurance limit (CP tests only) was related to tensile strength and fracture behavior.

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Fatigue Crack Formation Associated With Cyclic Slip Deformation Along Prior Austenite Grain Boundaries

Cited by 2 publications

References 3 publications

The Role of Prior Austenite Grains in Fatigue Crack Initiation and Propagation in Low Carbon Martensite

The Role of Prior Austenite Grains in Fatigue Crack Initiation and Propagation in Low Carbon Martensite

Keyhole Compact Tension Specimen Fatigue of Selected High-Strength Steels in Seawater

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