Stress shielding and fatigue crack growth resistance in ferritic–pearlitic steel

Mutoh, Yoshiharu; Korda, Akhmad A.; Miyashita, Yukio; Sadasue, Teruki

doi:10.1016/j.msea.2006.07.171

Cited by 57 publications

(42 citation statements)

References 14 publications

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“…Therefore, the crack tip stress shielding effect was also taken into account as the same as in the previous work (19) .…”

Section: Evaluation Of Effective Crack Tip Stress Intensity Factor Rangementioning

confidence: 99%

“…To investigate the effect of crack tip stress shielding on fatigue crack growth resistance, the effective crack tip stress intensity factor range, ) ( (19) , where both crack closure and crack tip stress shielding effects are taken into consideration, as shown in Fig.4. From the results, fatigue crack growth curves for the four materials were rearranged by…”

Section: Effect Of Crack Tip Stress Shieldingmentioning

confidence: 99%

“…They explained that the constrained plastic deformation in the ferrite region at the crack tip would be the main reason for higher crack growth resistance of MEF. Mutoh and co-workers (15) (19) reported on microstructure-controlled ferrite-pearlite two phase steels that a microstructure with uniformly distributed pearlite particles in ferrite matrix (Steel D) showed higher fatigue crack growth resistance compared to those with layered pearlite bands in ferrite matrix (Steel B) and with coarse networked pearlite phase with encapsulated ferrite phase (Steel N). They showed based on the in-situ observations and fracture mechanical discussion that the crack path of Steel D was frequently deflected in micro scale due to distributed pearlite particles, which induced interlocking between crack surfaces and then crack tip stress shielding.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Second Phase Particle on Fatigue Crack Growth Behavior in Ferrite Matrix Steels

Mustapa

Otsuka

Mutoh

2009

JMMP

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Fatigue crack growth tests of two ferrite-pearlite and two ferrite-bainite steels with different size and spacing of particle, where pearlite/bainite (hard) particles were uniformly distributed in the ferrite matrix, were carried out to investigate effect of second phase particle on fatigue crack growth behavior in Paris regime. The fatigue crack growth curves for the four materials did not coincide each other, even when the crack growth curves were arranged by the effective stress intensity factor range. From the in-situ observations, crack tip stress shielding phenomena, such as interlocking, branching, etc were found on the crack wake, which enhanced fatigue crack growth resistance. Small size and spacing of pearlite/bainite particle seemed to induce small but frequent crack deflections, which resulted in crack closure phenomena. On the other hand, large size of pearlite/bainite particle seemed to induce stress shielding phenomena and then contribute to high crack growth resistance, which was the main reason for lower fatigue crack growth rate of the large size and spacing of hard particle compared the small size of hard particle.

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“…Therefore, the crack tip stress shielding effect was also taken into account as the same as in the previous work (19) .…”

Section: Evaluation Of Effective Crack Tip Stress Intensity Factor Rangementioning

confidence: 99%

Section: Effect Of Crack Tip Stress Shieldingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Second Phase Particle on Fatigue Crack Growth Behavior in Ferrite Matrix Steels

Mustapa

Otsuka

Mutoh

2009

JMMP

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“…[2,4] Often, the microstructural conditions improving S-N fatigue resistance are not necessarily beneficial to and in some cases are deleterious to FCP resistance. [2] The resistance to FCP of steel in stage I (low DK regime in which FCP rates are typically less than 10 À9 m/cycle) and stage III (high DK regime with uncontrollable fatigue crack propagation) regime is known to be influenced greatly by microstructural features and YS, [6,7] whereas it is less significant in stage II (intermediate DK regime showing a linear relationship between log[da/dN] and log[DK]) regime. [6,7] Figure 1 illustrates each stage of fatigue crack propagation.…”

Section: Introductionmentioning

confidence: 99%

“…[2] The resistance to FCP of steel in stage I (low DK regime in which FCP rates are typically less than 10 À9 m/cycle) and stage III (high DK regime with uncontrollable fatigue crack propagation) regime is known to be influenced greatly by microstructural features and YS, [6,7] whereas it is less significant in stage II (intermediate DK regime showing a linear relationship between log[da/dN] and log[DK]) regime. [6,7] Figure 1 illustrates each stage of fatigue crack propagation. The greater influence of microstructure on FCP behavior in a low DK regime often has been attributed to crack closure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on Fatigue Crack Propagation and S–N Fatigue Behaviors of TMCP Steels with Yield Strengths of Approximately 450 MPa

Kim

Kwon

Lee

et al. 2010

Metall Mater Trans A

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In the present study, stress (S) -number of cycles to failure (N) (S-N) fatigue and fatigue crack propagation behaviors of three thermomechanical control process steels with different microstructures but similar yield strengths of approximately 450 MPa were investigated. The P + F steel was predominately pearlite plus ferrite, whereas B1 and B2 steels were both bainitic steels with martensite-austenite and pearlitic islands. Despite the significant difference in microstructural features, the resulting fatigue crack propagation rates and near-threshold DK values were comparable with each other. The hard phases, such as pearlite colonies in the P + F specimen, tended to affect fatigue crack propagation behavior in a similar manner, and severe crack branching was observed in intermediate and high DK regimes. Despite similar fatigue crack propagation rates and near-threshold DK values, the resistance to S-N fatigue was substantially different for each steel specimen. Depending on fatigue crack initiators, such as the ferrite/pearlite phase boundaries for the P + F specimens and the cracked martensite-austenite and/or small pearlitic islands for the bainitic specimens, the cycles for crack initiation varied greatly.

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Influence of Long Term Ageing on Fatigue Crack Growth Behavior of P91 Steel at Different Temperatures

Babu¹,

Swain²,

Dutt³

et al. 2014

Fatigue of Materials III Advances and Emergences in Understanding

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Stress shielding and fatigue crack growth resistance in ferritic–pearlitic steel

Cited by 57 publications

References 14 publications

Influence of Second Phase Particle on Fatigue Crack Growth Behavior in Ferrite Matrix Steels

Influence of Second Phase Particle on Fatigue Crack Growth Behavior in Ferrite Matrix Steels

Effect of Microstructure on Fatigue Crack Propagation and S–N Fatigue Behaviors of TMCP Steels with Yield Strengths of Approximately 450 MPa

Influence of Long Term Ageing on Fatigue Crack Growth Behavior of P91 Steel at Different Temperatures

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