Surface intergranular cracking in large strain fatigue

Lim, L. C.

doi:10.1016/0001-6160(87)90113-1

Cited by 49 publications

(13 citation statements)

References 30 publications

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“…Therefore, it is possible that the grain boundary is damaged (microvoid, microcrack) by slips produced by hydrogen. For example, an intergranular crack initiates by cyclic slip at elevated temperature (10) or at low cycle fatigue (11), (12) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanism for Intergranular Fatigue Crack Propagation of Low Carbon Steel JIS S10C in Hydrogen Gas Environment

Nishikawa

Oda

Nishikawa

2011

JMMP

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In order to investigate the mechanism for the intergranular fatigue crack propagation of a low carbon steel in a low pressure hydrogen gas environment, two kinds of examinations were carried out. One examined the effect of the cyclic pre-strain on the crack growth behavior. The other was the in-situ observation of intergranular fatigue crack propagation in a hydrogen gas environment. The main results are as follows. (1) SEM observation of the specimen surface morphology of a plain specimen fatigued in hydrogen gas showed that a gap at the grain boundary was induced by slip behavior, but not in nitrogen gas. (2) A specimen cyclic-prestrained in hydrogen gas showed slight influences on the increase in the crack propagation rate. (3) Mating intergranular facets on the fatigue fracture surfaces showed the matching of a striation-like pattern in the manner anticipated from the damage mechanism of (1). (4) The environment-change test from hydrogen to nitrogen during the fatigue test showed that intergranular facets appeared even in nitrogen. Results (3) and (4) suggests that the damaging process of (1) is valid in an actual fatigue crack. (5) In-situ observation of the crack propagation behavior in hydrogen gas showed that a crack propagated faster along the grain boundary. However, no visible discontinuous crack advances appeared as a large number of load repetitions was required. Phenomena considered to be a damage process (1) appeared ahead of a crack tip. Based on these results, a convincing mechanism for the intergranular fatigue crack propagation process is as follows. Grain boundaries just ahead of a crack tip are damaged due to the large number of hydrogen-enhanced slip repetitions, therefore, the fatigue crack becomes easier to propagate along the grain boundary in hydrogen.

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Section: Introductionmentioning

confidence: 99%

Investigation of Mechanism for Intergranular Fatigue Crack Propagation of Low Carbon Steel JIS S10C in Hydrogen Gas Environment

Nishikawa

Oda

Nishikawa

2011

JMMP

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“…Kronberg and Wilson noted the significance of low˙values for nucleation and growth during secondary recrystallization of copper as they found less segregation existing in these low˙boundaries. More recently, experimental studies have shown that CSL boundaries of high CSL density/low˙value do not crack during fatigue of Ni [17], stress corrosion of a Ni-based superalloy [18], and cavitation of Cu [19]. By looking at each lattice relative to the supercell background, we can see that the (bottom left) lattice is in perfect agreement but after undergoing the rotation (top right), the blue atoms correspond to the background meanwhile the red and silver atoms are interchanged.…”

Section: Introductionmentioning

confidence: 99%

Grain boundary characterization and energetics of superalloys

Sangid¹,

Şehitoğlu²,

Maier³

et al. 2010

Materials Science and Engineering: A

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“…Based on the fatigue cracking along PSBs, the volume fraction of PSBs has been considered as a fatigue damage parameter when predicting the fatigue life of polycrystals [9–11 ]. On the other hand, in polycrystalline materials, it is found that GBs [14–19 ] and twin boundaries (TBs) [20–22 ] can also become the preferential sites leading to fatigue cracking. The crystallographic conditions and dislocation mechanisms of intergranular fatigue cracking have been analysed by Kim and Laird [14,15 ], Chang [16], and Christ [17 ].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Cracking Possibility Along Grain Boundaries and Persistent Slip Bands in Copper Bicrystals

Zhang

Wang

1998

Fatigue Fract Eng Mat Struct

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In this paper, the fatigue cracking possibility in different kinds of copper bicrystals with large‐angle grain boundaries (GBs) and copper multicrystals containing some low‐angle GBs are compared. The results showed that the fatigue cracks, in the copper bicrystals, always nucleated firstly along GBs no matter whether the GBs are perpendicular or parallel to the stress axis. Whereas, for the copper multicrystals containing low‐angle GBs, the persistent slip bands (PSBs) are always the preferential sites to initiate fatigue cracks no matter whether low‐angle GBs are perpendicular or parallel to the stress axis. Additionally, the fatigue lives of the GBs, and the [1¯23] and [3¯35] grains in the [1¯23] ⊥ [3¯35] and [5¯913] ⊥ [5¯79] bicrystals were measured at different cyclic stresses and strain amplitudes. The results show that intergranular fracture always occurred prior to transgranular fracture in those bicrystals. The fatigue lives increased in the order of the GB, the [1¯23] and the [3¯35] grains in the [1¯23] ⊥ [3¯35] bicrystal under cyclic tension–tension loading. On the other hand, the fatigue life of the GB in the [5¯913] ⊥ [5¯79] bicrystal is about two to three times higher than that in the [1¯23] ⊥ [3¯35] bicrystal. Based on these experimental results from the copper bicrystals and multicrystals, it is indicated that the possibility of fatigue cracking increased in the order of low‐angle GBs, PSBs and large‐angle GBs. It is suggested that both the PSB–GB mechanism and the step mechanism required for GB fatigue cracking were questionable, and the interaction modes of PSBs with GBs may be more important for intergranular fatigue cracking.

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Surface intergranular cracking in large strain fatigue

Cited by 49 publications

References 30 publications

Investigation of Mechanism for Intergranular Fatigue Crack Propagation of Low Carbon Steel JIS S10C in Hydrogen Gas Environment

Investigation of Mechanism for Intergranular Fatigue Crack Propagation of Low Carbon Steel JIS S10C in Hydrogen Gas Environment

Grain boundary characterization and energetics of superalloys

Fatigue Cracking Possibility Along Grain Boundaries and Persistent Slip Bands in Copper Bicrystals

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