Threshold stress intensity factor of ultra-high strength steel (HV670) containing surface crack by hydrogen assisted cracking and cumulative elastic wave

Lee, Ki-Sik; Paeng, Jae-Eun; Gu, Kyoung-Hee; Nam, Ki-Woo

doi:10.1007/s12206-021-0515-2

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…4 shows the static fatigue limit with respect to the crack depth. The solid line was obtained by substituting the static fatigue limit (400 MPa) obtained experimentally (solid line) and the threshold stress intensity factor 𝐾𝐾 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼(𝑎𝑎) = 1.96 MPa√𝑚𝑚 based on the crack depth [21]. The results obtained from the static fatigue test and the calculation using Eq.…”

Section: Static Fatigue Limit Of Cracked Specimenmentioning

confidence: 99%

Evaluation of Fatigue Life of Ultra-High-Strength Steel under Stress Corrosion Environment

Lee

et al. 2022

AMM

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Ultra-high-strength steel (UHSS) structures are exposed to corrosive environments during service, and hydrogen-assisted cracking (HAC) may occur owing to stress corrosion cracking and hydrogen embrittlement. In this study, the HAC threshold stress intensity factor and fatigue life of UHSS steel were evaluated by applying stress in a corrosive environment to prevent structural fracture. For specimen with semicircular slits by electric discharge machining, fatigue limit was obtained by static fatigue test under corrosive environment. The fatigue limit of the crack specimen was evaluated by the fatigue limit of the experiment and HAC threshold stress intensity factor, and comparative evaluation was performed. On the surface of cracks, grain boundaries were embrittled by corrosion, and grains were clearly observed. Meanwhile, cracks in the surface direction propagated slightly, unlike cracks in the depth direction. The static fatigue limit of UHSS (SKD11:HV670) was determined to be 400 MPa, and the fatigue limit of the crack specimen could be evaluated. The experimental results agreed well with the evaluation results.

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Section: Static Fatigue Limit Of Cracked Specimenmentioning

confidence: 99%

Evaluation of Fatigue Life of Ultra-High-Strength Steel under Stress Corrosion Environment

Lee

et al. 2022

AMM

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“…The surface adsorption theory states that hydrogen adsorbed at the crack tip reduces the surface energy of crack growth [17], and the local plasticity increase theory asserts that cracks occur because of local suppression of plastic deformation by hydrogen [18]. However, there are few nondestructive evaluations for the detection of an elastic wave following the initiation and propagation of cracks in a hydrogen atmosphere [19].…”

Section: Introductionmentioning

confidence: 99%

Elastic-Wave Characteristics from Crack Initiation and Propagation of High-Strength Steel Immersed in Acetic-Acid Solution

Paeng

Lee

et al. 2023

AMM

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In this study, elastic waves were detected when different bending stresses were applied to cracked specimens of high-strength steel (SKD11: HV550) immersed in a 0.057 M solution of acetic acid (CH3COOH), and frequency characteristics were analyzed using time-frequency analysis. The dominant frequency obtained using the tensile test was approximately 103 kHz, and those in the acetic-acid solution without stress were approximately 32 and 101 kHz. The dominant frequencies of the crack specimens in which cracks propagated were approximately 30–40 (F1), 60–85 (F2), and 100–110 (F3) kHz. An elastic wave was obtained by corrosion, pitting, crack initiation, and propagation but not during the hydrogen aggregation time. The dominant frequencies of the crack specimens without crack propagation were approximately 28–33 (F1) and 94–109 (F3) kHz. These were the same as the dominant frequency in the acetic-acid solution under nonstress conditions. The fractured surface showed many traces of pitting and corrosion regardless of the applied stress, resulting in microcracks in the Cr carbide. -----------------------------------------------------------------------------------------------------------

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Elastic wave properties in ultra-high strength steel (HV670) exposed to various corrosive solutions

2023

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Threshold stress intensity factor of ultra-high strength steel (HV670) containing surface crack by hydrogen assisted cracking and cumulative elastic wave

Cited by 5 publications

References 22 publications

Evaluation of Fatigue Life of Ultra-High-Strength Steel under Stress Corrosion Environment

Evaluation of Fatigue Life of Ultra-High-Strength Steel under Stress Corrosion Environment

Elastic-Wave Characteristics from Crack Initiation and Propagation of High-Strength Steel Immersed in Acetic-Acid Solution

Elastic wave properties in ultra-high strength steel (HV670) exposed to various corrosive solutions

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