Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels: The kinetic effect viewpoint

Bochuan Li; Motomichi Koyama; Eisaku Sakurada; Nobuyuki Yoshimura; Kohsaku Ushioda; Hiroshi Noguchi

doi:10.1016/j.ijfatigue.2017.01.029

Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels: The kinetic effect viewpoint

Bochuan Li, Motomichi Koyama, Eisaku Sakurada, Nobuyuki Yoshimura, Kohsaku Ushioda, Hiroshi Noguchi

Strength of materials

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Tension tests at different strain rates for five water-quenched Fe-C fully ferritic steels with different interstitial carbon contents were conducted at room temperature (RT), which verified occurrence of dynamic strain aging (DSA). The threshold stress intensity factor ranges (ΔK_th) of small crack for these materials were determined by using rotating bending fatigue tests on specimens micro-notched by a focused ion beam technique. The experimentally determined ΔK_th increased, first steeply and then moderately, with increasing carbon concentration. The experimental ΔK_th of a Fe-0.017C (wt.%) steel with maximum carbon content was approximately 40.5% higher than conventionally predicted results by Murakami's equation. The outstanding resistance to fatigue crack propagation probably stems from enhanced DSA, cohesive strength of grain boundary (GB) and material strength in the vicinity of GB with the growth of carbon content.

Original language	English
Pages (from-to)	101-110
Number of pages	10
Journal	International Journal of Fatigue
Volume	98
DOIs	https://doi.org/10.1016/j.ijfatigue.2017.01.029
Publication status	Published - May 1 2017

All Science Journal Classification (ASJC) codes

Modelling and Simulation
Materials Science(all)
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ijfatigue.2017.01.029

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title = "Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels: The kinetic effect viewpoint",

abstract = "Tension tests at different strain rates for five water-quenched Fe-C fully ferritic steels with different interstitial carbon contents were conducted at room temperature (RT), which verified occurrence of dynamic strain aging (DSA). The threshold stress intensity factor ranges (ΔKth) of small crack for these materials were determined by using rotating bending fatigue tests on specimens micro-notched by a focused ion beam technique. The experimentally determined ΔKth increased, first steeply and then moderately, with increasing carbon concentration. The experimental ΔKth of a Fe-0.017C (wt.%) steel with maximum carbon content was approximately 40.5% higher than conventionally predicted results by Murakami's equation. The outstanding resistance to fatigue crack propagation probably stems from enhanced DSA, cohesive strength of grain boundary (GB) and material strength in the vicinity of GB with the growth of carbon content.",

author = "Bochuan Li and Motomichi Koyama and Eisaku Sakurada and Nobuyuki Yoshimura and Kohsaku Ushioda and Hiroshi Noguchi",

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T1 - Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels

T2 - The kinetic effect viewpoint

AU - Li, Bochuan

AU - Koyama, Motomichi

AU - Sakurada, Eisaku

AU - Yoshimura, Nobuyuki

AU - Ushioda, Kohsaku

AU - Noguchi, Hiroshi

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Tension tests at different strain rates for five water-quenched Fe-C fully ferritic steels with different interstitial carbon contents were conducted at room temperature (RT), which verified occurrence of dynamic strain aging (DSA). The threshold stress intensity factor ranges (ΔKth) of small crack for these materials were determined by using rotating bending fatigue tests on specimens micro-notched by a focused ion beam technique. The experimentally determined ΔKth increased, first steeply and then moderately, with increasing carbon concentration. The experimental ΔKth of a Fe-0.017C (wt.%) steel with maximum carbon content was approximately 40.5% higher than conventionally predicted results by Murakami's equation. The outstanding resistance to fatigue crack propagation probably stems from enhanced DSA, cohesive strength of grain boundary (GB) and material strength in the vicinity of GB with the growth of carbon content.

AB - Tension tests at different strain rates for five water-quenched Fe-C fully ferritic steels with different interstitial carbon contents were conducted at room temperature (RT), which verified occurrence of dynamic strain aging (DSA). The threshold stress intensity factor ranges (ΔKth) of small crack for these materials were determined by using rotating bending fatigue tests on specimens micro-notched by a focused ion beam technique. The experimentally determined ΔKth increased, first steeply and then moderately, with increasing carbon concentration. The experimental ΔKth of a Fe-0.017C (wt.%) steel with maximum carbon content was approximately 40.5% higher than conventionally predicted results by Murakami's equation. The outstanding resistance to fatigue crack propagation probably stems from enhanced DSA, cohesive strength of grain boundary (GB) and material strength in the vicinity of GB with the growth of carbon content.

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ER -

Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels: The kinetic effect viewpoint

Abstract

All Science Journal Classification (ASJC) codes

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