Effect of microstructural features on short fatigue crack growth behaviour in SA508 Grade 3 Class I low alloy steel

Singh, Rajwinder; Singh, Amanjot; Singh, Pawan Kumar; Mahajan, Dhiraj K.

doi:10.1016/j.ijpvp.2020.104136

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…11–13 By studying the evolution process of fatigue crack initiation and propagation on the micromechanical scale, 14–17 the crack morphology, distribution, and evolution law of short crack initiation and propagation are found. 18–20…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13] By studying the evolution process of fatigue crack initiation and propagation on the micromechanical scale, [14][15][16][17] the crack morphology, distribution, and evolution law of short crack initiation and propagation are found. [18][19][20] In order to study the initiation and propagation of cracks at the micromechanical level, a fine fatigue test is carried out directly under a microscope with the help of several micro fatigue testing devices during this paper, aiming at clarifying the micro damage mechanism at the initial stage of fatigue.…”

Section: Introductionmentioning

confidence: 99%

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Research on evolution behavior of 42CrMo microscopic fatigue short crack based on microstructure effect of material

Wang

et al. 2022

Advances in Mechanical Engineering

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To investigate the causes of damage dispersion in fatigue life of alloy materials, fatigue tests on 42CrMo are carried out under microscope with the aid of a micro fatigue testing device. The fatigue crack initiation and propagation evolution process of 42CrMo are studied on the micromechanical scale. The fatigue short crack and short crack growth rates are measured respectively under loads of 1400, 1550, and 1650 N. The experimental result shows that the initiation of fatigue short cracks is related to the randomness of microstructure defects. The initiation and propagation of fatigue short cracks on the surface of samples are random and local, while the propagation is characterized by first deceleration and then acceleration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on evolution behavior of 42CrMo microscopic fatigue short crack based on microstructure effect of material

Wang

et al. 2022

Advances in Mechanical Engineering

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“…In [ 5 ], the effect of microstructural features of the SA508 Grade 3 Class I low-alloy steel (LAS) has been investigated. The propagation of short cracks below the ΔK th threshold value, as well as limitation of the movement of dislocations in front of the crack tip and, accordingly, slowing its velocity when approaching the grain boundaries, have been found experimentally.…”

Section: Introductionmentioning

confidence: 99%

Increasing Fatigue Life of 09Mn2Si Steel by Helical Rolling: Theoretical–Experimental Study on Governing Role of Grain Boundaries

et al. 2020

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The structure and mechanical properties of the 09Mn2Si high-strength low-alloyed steel after the five-stage helical rolling (HR) were studied. It was revealed that the fine-grained structure had been formed in the surface layer ≈ 1 mm deep as a result of severe plastic strains. In the lower layers, the “lamellar” structure had been formed, which consisted of thin elongated ferrite grains oriented in the HR direction. It was shown that the five-stage HR resulted in the increase in the steel fatigue life by more than 3.5 times under cyclic tension. The highest values of the number of cycles before failure were obtained for the samples cut from the bar core. It was demonstrated that the degree of the elastic energy dissipation in the steel samples under loading directly depended on the area of the grain boundaries as well as on the grain shapes. The fine-grained structure possessed the maximum value of the average torsional energy among all the studied samples, which caused the local material structure transformation and the decrease in the elastic energy level. This improved the crack resistance under the cyclic mechanical loading. The effect of the accumulation of the rotational strain modes at the grain boundaries was discovered, which caused the local structure transformation at the boundary zones. In the fine-grained structure, the formation of grain conglomerates was observed, which increased the values of the specific modulus of the moment of force. This could be mutually compensated due to the small sizes of grains. At the same time, the coarse-grained structures were characterized by the presence of the small number of grains with a high level of the moments of forces at their boundaries. They could result in trans-crystalline cracking.

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Low Cycle Fatigue Behavior and Failure Mechanism of Wire Arc Additive Manufacturing 16MND5 Bainitic Steel

Song

et al. 2021

J. of Materi Eng and Perform

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Effect of microstructural features on short fatigue crack growth behaviour in SA508 Grade 3 Class I low alloy steel

Cited by 11 publications

References 25 publications

Research on evolution behavior of 42CrMo microscopic fatigue short crack based on microstructure effect of material

Research on evolution behavior of 42CrMo microscopic fatigue short crack based on microstructure effect of material

Increasing Fatigue Life of 09Mn2Si Steel by Helical Rolling: Theoretical–Experimental Study on Governing Role of Grain Boundaries

Low Cycle Fatigue Behavior and Failure Mechanism of Wire Arc Additive Manufacturing 16MND5 Bainitic Steel

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