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KATO, Eiji; KOBAYASHI, Toshiro

doi:10.2464/jilm.30.147

Cited by 4 publications

(1 citation statement)

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“…Static fracture phenomena of the hard second phase during fatigue crack growth have been reported in metal matrix composites containing a compound phase such as SiC particle-reinforced Al alloy composites, 24,25) WC-Co based cemented carbides [26][27][28] and Al-Si based casting alloys with hard Si particles as the second phase. [29][30][31][32][33] Kobayashi et al 24) investigated the SiC particle behavior during fatigue crack growth in Al alloy composites, and pointed out that fatigue crack growth was promoted by delamination between the SiC particles and the matrix and/or cleavage cracking of the SiC particles themselves, and the crack growth rate was accelerated by an increase in the SiC volume fraction. In addition, Sunouchi et al 28) examined the fatigue crack growth mechanism of WC-Co sintered materials using an acoustic emission technique, and concluded that the crack growth rate was accelerated by brittle fracture of WC particles and the particle fracture frequency increased with an increase of K max .…”

Section: (G))mentioning

confidence: 99%

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Ando¹,

Ohtsubo²,

Tagawa³

2023

ISIJ Int.

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The influence of pro-eutectoid cementite (θ) on fatigue crack growth behavior was investigated using various pearlitic steels containing from 0.64 to 1.21 mass% C. The fatigue crack growth rates of the hypoeutectoid and eutectoid pearlitic steels hardly changed, while that of the 1.21 mass% C steel having a large amount of pro-eutectoid θ was accelerated, especially in the high stress intensity factor region. Scanning electron microscope (SEM) observation revealed that the fatigue fracture surface of the 1.21 mass% C steel more frequently contained islanded brittle fracture surfaces than that in other steels. In the 1.21 mass% C steel, the total area fraction of brittle fracture surfaces was notably increased with an enhancement in maximum stress intensity factor (K max ) due to crack extension. More detailed SEM fractographies were performed comparing between before and after etching were performed in order to identify microstructures beneath the brittle fracture appearances on the fatigue fracture surface of the 1.21 mass% C steel. As a result, it was suggested that pro-eutectoid θ was involved in the formation of brittle fracture. Based on these investigations, the accelerated fatigue crack growth behavior of hyper-eutectoid steel was discussed in terms of static brittle fracture induced by pro-eutectoid θ near the crack tip.

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