Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 °C

Kong, Weiwen; Yuan, Chao; Zhang, Baoning; Qin, Heyong; Zhao, Guizhe

doi:10.1016/j.msea.2019.02.075

Cited by 19 publications

(10 citation statements)

References 36 publications

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“…Multiple fatigue crack initiation occurred, and the fracture surfaces were dimple-like, indicating transgranular fatigue crack propagation, typical for superalloys at room temperature. 11,13,16,37 The extensive surface roughening by PSMs (see Figure 7C) with numerous cracks starting from the PSMs and following an active slip plane (Figure 7D,E) agrees with previous investigations. 11,13,16,37 The occurrence of PSMs, as well as the underlying PSBs, is a manifestation of the localized cyclic plastic straining of the material.…”

Section: Fatigue Damage and Fatigue Life At Room Temperaturesupporting

confidence: 90%

“…11,13,16,37 The extensive surface roughening by PSMs (see Figure 7C) with numerous cracks starting from the PSMs and following an active slip plane (Figure 7D,E) agrees with previous investigations. 11,13,16,37 The occurrence of PSMs, as well as the underlying PSBs, is a manifestation of the localized cyclic plastic straining of the material. The initiation of the fatigue cracks in room temperature fatigue of René 41 superalloy is strongly dependent on plastic strain amplitude.…”

Section: Fatigue Damage and Fatigue Life At Room Temperaturesupporting

confidence: 90%

“…This process has been documented for superalloys. 9,11,12,16,19 Fatigue cracks start mostly from PSMs (see the statistics in Figure 14). Multiple fatigue crack initiation occurred, and the fracture surfaces were dimple-like, indicating transgranular fatigue crack propagation, typical for superalloys at room temperature.…”

Section: Fatigue Damage and Fatigue Life At Room Temperaturementioning

confidence: 99%

“…Superalloys often exhibit initial cyclic hardening followed by long-term cyclic softening. 9,[13][14][15][16] Le on-C azares 9 enumerated possible mechanisms resulting in cyclic hardening/ softening and discussed a physics-based description of the cyclic softening behavior based on the mechanism of continuous γ 0 precipitate shearing. Due to the cyclic slip localization, γ 0 shearing largely occurs due to the interaction with dislocations in slip bands.…”

Section: Introductionmentioning

confidence: 99%

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Importance of γ′ shearing in low‐cycle fatigue of a wrought superalloy

Babinský,

Poczklán,

Gálíková

et al. 2024

Fatigue Fract Eng Mat Struct

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The present study deals with the fatigue behavior of a wrought nickel‐based superalloy René 41. Uniaxial, fully reversed low‐cycle fatigue tests were conducted at room and elevated (800°C) temperatures under total strain control. Cyclic response was analyzed using the statistical theory of the hysteresis loop, and scanning and transmission electron microscopies were employed to study relevant damage mechanisms. At room temperature, cyclic deformation was found to localize to slip bands since the first cycle, and most slip bands were formed very early in the fatigue life. Hence, shearing of the strengthening phase, coherent γ′ precipitates, was found to be significant only in the first few cycles. At 800°C, fatigue life was affected by an environmental attack resulting in a surface oxide layer. Cyclic deformation was less localized; nevertheless, cyclic slip localization in persistent slip bands and resulting γ′ shearing contributed to cyclic softening throughout the fatigue life.

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Section: Fatigue Damage and Fatigue Life At Room Temperaturesupporting

confidence: 90%

Section: Fatigue Damage and Fatigue Life At Room Temperaturesupporting

confidence: 90%

Section: Fatigue Damage and Fatigue Life At Room Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Importance of γ′ shearing in low‐cycle fatigue of a wrought superalloy

Babinský,

Poczklán,

Gálíková

et al. 2024

Fatigue Fract Eng Mat Struct

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“…The fracture morphologies of the LCF samples with different strain amplitudes of 0.2% and 0.6% at 700 °C are exhibited in Figure 12 . Figure 12 shows the typical characteristics with the three regions comprising the fatigue source, fatigue crack propagation zone and final fracture zone [ 19 ]. It can be seen from Figure 12 that when the strain amplitude increased from 0.2% to 0.6%, the crack propagation area decreased, the number of crack initiation sources of the novel steel was less than that of the 30SiMn2MoV steel and the crack propagation area was greater than that of 30SiMn2MoV steel with the same strain amplitude.…”

Section: Resultsmentioning

confidence: 99%

Low-Cycle Fatigue Behavior of the Novel Steel and 30SiMn2MoV Steel at 700 °C

Zhao

Zhang

et al. 2020

Materials

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As a newly developed gun barrel steel, the novel steel has shown excellent high-temperature strength, high resistance to wear and erosion, contributing to the superior ballistic life of gun barrels. As ballistic life increases, the fatigue life becomes essential for the safety and reliability of gun barrels. This paper presents a comparison of the low cycle fatigue (LCF) behaviors between a novel steel and 30SiMn2MoV steel at 700 °C. A strain-controlled fatigue test was carried out on the novel steel and 30SiMn2MoV steel in the strain range from 0.2 to 0.6%. The cyclic stress response behaviors of the novel steel and 30SiMn2MoV steel show cyclic softening behavior. In addition, the shape of the hysteresis rings of the novel steel and 30SiMn2MoV steel exhibit no-Masing model behavior. Energy–life relationships results show that the novel steel has higher fatigue resistance than the 30SiMn2MoV steel at 700 °C. The results of fatigue fracture analysis show that the failure mode of the 30SiMn2MoV steel is a mixed mode of intergranular fracture and transgranular fracture, while the failure mode of the novel steel is intergranular fracture. The cyclic softening of the two materials can be attributed to the lath structure with a high density of dislocations gradually transforms into low energy subcrystalline and cellular structures at 700 °C. The novel steel has a better fatigue life than the 30SiMn2MoV steel at 700 °C and different strain amplitudes, which is mainly related to the carbides and lath martensite in the materials.

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