Experimental investigation of grain size effect on fatigue crack growth rate in turbine disc superalloy GH4169 under different temperatures

Hu, Dianyin; Mao, Jianqin; Song, Jun; Meng, Fanchao; Shan, Xiaoming; Wang, Rongqiao

doi:10.1016/j.msea.2016.05.063

Cited by 65 publications

(21 citation statements)

References 34 publications

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“…In summary, these researchers considered that crack propagation is dependent on dislocation motion, so in a finer grain structure, more grain boundaries are available to hinder the dislocation motion, which can be beneficial to improving the fatigue crack propagation resistance. By contrast, other researchers find that a coarse microstructure is associated with better fatigue crack propagation resistance . For example, Ma et al investigated the fatigue crack growth behaviors of coarser‐grained and fine‐grained high manganese austenitic twin‐induced plasticity steels.…”

Section: Introductionmentioning

confidence: 99%

Competition mechanisms of fatigue crack growth behavior in lath martensitic steel

Yang

Zhong

Liang

2018

Fatigue Fract Eng Mat Struct

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The fatigue crack growth behavior in 20CrMnTi lath martensitic steel with a hierarchical structure was investigated at room temperature. The microstructure was quantitatively characterized by optical microscopy, scanning electron microscopy, electron backscattering diffraction, and transmission electron microscopy. Crack growth tests were performed at a stress ratio of 0.1 under the control of a stress intensity factor range using compact tension specimens. The results show that the lath martensite with medium grain size quenched in ice salt water possessed the highest fatigue crack propagation resistance, which was attributed to the relatively high intrinsic propagation resistance and extrinsic propagation resistance. Meanwhile, the results indicate that the intrinsic propagation resistance increased with the grain size, while the extrinsic propagation resistance showed an inverse tendency. In addition, the effect of substructure on the fatigue propagation properties is discussed. The deflection angle of block interfaces in the crack growth path indicated the block unit had a significant effect on the fatigue crack propagation behavior of lath martensitic steel. Based on the Taylor model, the block size (db) was considered to be the effective grain size for controlling the crack growth threshold value (∆Kth).

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Section: Introductionmentioning

confidence: 99%

Competition mechanisms of fatigue crack growth behavior in lath martensitic steel

Yang

Zhong

Liang

2018

Fatigue Fract Eng Mat Struct

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“…Therefore, the microstructures of these materials would be more parametrically affected when compared with traditional alloys, resulting in different macro‐ and micro‐mechanical properties of alloys from forged and casted materials. Hovig et al reported that the surface roughness of SLM alloys might lead to a notch effect and stress concentration, which are due to the inclusions inside the materials . The stress concentration would lead to earlier crack initiation and thereby reduce fatigue life.…”

Section: Introductionmentioning

confidence: 99%

“…Hovig et al 13 reported that the surface roughness of SLM alloys might lead to a notch effect and stress concentration, 14,15 which are due to the inclusions inside the materials. [16][17][18] The stress concentration would lead to earlier crack initiation and thereby reduce fatigue life. Witkin et al 19 also reported that the stress intensity associated with surface roughness on as-produced surfaces of SLM Inconel 718 exhibited a negative effect on the fatigue life of specimens.…”

Section: Introductionmentioning

confidence: 99%

On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

Zhang

Ren

et al. 2020

Fatigue Fract Eng Mat Struct

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The building of Inconel 625 material was carried out using the selective laser melting method, and its fatigue crack growth property at ambient temperature was experimentally investigated. Compact‐tension specimens with different building orientations were utilized to determine the stress intensity factor threshold and fatigue crack growth rate curves at different stress ratios (R). The results indicated that the fatigue crack growth properties in the near threshold stress intensity factor and Paris regions were greatly affected by the loading factor, as well as the orientation of the alloy. The mechanism of fatigue crack growth at different stages was observed and discussed using scanning electron microscopy. Finally, based on the framework of the linear elastic fracture, a new and applicable effective driving force factor range was introduced to replace the traditional stress intensity factor range (ΔK) with good accuracy for all of the fatigue crack growth test data, considering both the stress ratio and orientation.

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“…Lower carbon content of core increases the fatigue resistance, particularly due to the enlarged compressive residual stresses at the surface, compared with the cases of higher carbon content [11]. The refinement of austenitic grain size is also one of these performances, which results in a fine martensitic structure and/or reduced size and density of micro cracks in the structure produce better fatigue resistance [12,13]. Many factors such as carburizing time and temperature during the various stages of a carburizing process affect the performance above [14,15].…”

Section: Introduction mentioning

confidence: 99%

Improvement and Analysis of Fatigue Strength for Mild Steel 20MnCrS5 during Carburizing and Quenching

Miao

Wang

et al. 2019

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Distortion and fatigue are both important criteria for evaluating carburizing and quenching process. An optimized process was proposed to reduce distortion and improve fatigue strength simultaneously. Mild steel 20MnCrS5 were heat treated using standard condition and optimized condition respectively. The microstructure, hardness, residual stress, domain size, fatigue performance and crack growth rate with different conditions were studied. Due to carburization, the near surface of the materials have different microstructures with different carbon concentration. The carburized layer, subsurface layer and central layer were selected to prepare the fatigue specimens and to be evaluated. The strengthening effect was verified by comparing the fatigue limit and the crack growth rate. The strengthening mechanism was analyzed by comparing microstructure, retained austenite, residual stress and domain size. The results show that with the optimized condition the fatigue performance at different layers are improved while achieving higher surface hardness. The joint action of domain refinement, more compressive residual stress and less retained austenite results in the strengthening.

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Experimental investigation of grain size effect on fatigue crack growth rate in turbine disc superalloy GH4169 under different temperatures

Cited by 65 publications

References 34 publications

Competition mechanisms of fatigue crack growth behavior in lath martensitic steel

Competition mechanisms of fatigue crack growth behavior in lath martensitic steel

On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

Improvement and Analysis of Fatigue Strength for Mild Steel 20MnCrS5 during Carburizing and Quenching

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