Effect of shot peening coverage on hydrogen embrittlement of a ferrite-pearlite steel

Wang, Yanfei; Xie, Hai; Zhou, Zhi; Li, Xinfeng; Wu, Weijie; Gong, Jianming

doi:10.1016/j.ijhydene.2020.01.021

Cited by 31 publications

(19 citation statements)

References 69 publications

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“…Besides, the increase in surface roughness (Figure 7b) and changes in the surface morphology (Figures 3 and 4) at the elevated peening pressure are indicative of the larger plastic deformation of the alloy at the higher peening pressure, leading to improved hardness. The improvement in hardness gradually decreases with increasing depth (Figure 2), in parallel to the literature on SP of 2024 Al alloy [74], 6061 Al alloy [42], Ti6Al4V alloy [56], ferrite-pearlite steels [63], pure copper [6], and AZ31 magnesium alloy [4]. The influence of the cover rate on hardness is not notable at the lower peening pressure, where it slightly enhances the hardness at high peening pressure (Figure 2b).…”

Section: Mechanical Properties Of Shot-peened Aa1050 Alloysupporting

confidence: 82%

“…Surface and cross-sectional SEM images of the shot-peened samples (Figures 3 and 4) revealed the modifications in surface morphology and subsurface microstructure as a function of SP pressure and cover rate. Even at the lower SP pressure (0.1 MPa), the surface of the samples is plastically deformed considerably, exhibiting dents and ridges caused by indentation by shots [35,45,63] (Figure 3a,b). The cross-sectional microstructure was crack-free at 0.1 MPa and 100% cover rate, proving that the surface integrity of the samples was generally maintained.…”

Section: Modification Of Surface Morphology and Subsurface Microstructurementioning

confidence: 99%

“…The mechanical properties of the surface and subsurface were significantly improved by SP (Figure 2) due to the aforementioned strengthening mechanisms. Briefly, SP improves the hardness of metals by refining the grain size and increasing the dislocation density within the peening-affected zone through localised SPD [54], activating the aforementioned strengthening mechanisms (i.e., Hall-Petch strengthening) [63]. Furthermore, forming a nanocrystalline layer with high dislocation density beneath the shot-peened surface improves microhardness [58].…”

Section: Mechanical Properties Of Shot-peened Aa1050 Alloymentioning

confidence: 99%

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Modification of Surface and Subsurface Properties of AA1050 Alloy by Shot Peening

et al. 2021

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AA1050 Al alloy samples were shot-peened using stainless-steel shots at shot peening (SP) pressures of 0.1 and 0.5 MPa and surface cover rates of 100% and 1000% using a custom-designed SP system. The hardness of shot-peened samples was around twice that of unpeened samples. Hardness increased with peening pressure, whereas the higher cover rate did not lead to hardness improvement. Micro-crack formation and embedment of shots occurred by SP, while average surface roughness increased up to 9 µm at the higher peening pressure and cover rate, indicating surface deterioration. The areal coverage of the embedded shots ranged from 1% to 5% depending on the peening parameters, and the number and the mean size of the embedded shots increased at the higher SP pressure and cover rate. As evidenced and discussed through the surface and cross-sectional SEM images, the main deformation mechanisms during SP were schematically described as crater formation, folding, micro-crack formation, and material removal. Overall, shot-peened samples demonstrated improved mechanical properties, whereas sample surface integrity only deteriorated notably during SP at the higher pressure, suggesting that selecting optimal peening parameters is key to the safe use of SP. The implemented methodology can be used to modify similar soft alloys within confined compromises in surface features.

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Section: Mechanical Properties Of Shot-peened Aa1050 Alloysupporting

confidence: 82%

Section: Modification Of Surface Morphology and Subsurface Microstructurementioning

confidence: 99%

Section: Mechanical Properties Of Shot-peened Aa1050 Alloymentioning

confidence: 99%

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Modification of Surface and Subsurface Properties of AA1050 Alloy by Shot Peening

et al. 2021

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“…However, over shot peening (OSP) which induces higher kinetic energy than SSP has detrimental influence on surface of the target material. OSP create surface defects such as overlaps and nano/micro cracks [19][20][21]. It was reported that fatigue life reduces after performing OSP compared to the severely and/ or conventionally shot peened material [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Analysing the Fatigue Behaviour and Residual Stress Relaxation of Gradient Nano-Structured 316L Steel Subjected to the Shot Peening via Deep Learning Approach

et al. 2021

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In this study, the effect of kinetic energy of the shot peening process on microstructure, mechanical properties, residual stress, fatigue behavior and residual stress relaxation under fatigue loading of AISI 316L stainless steel were investigated to figure out the mechanisms of fatigue crack initiation and failure. Varieties of experiments were applied to obtain the results including microstructural observations, measurements of hardness, roughness, induced residual stress and residual stress relaxation as well as axial fatigue test. Then deep learning approach through neural networks was used for modelling of mechanical properties and fatigue behavior of shot peened material. Comprehensive parametric analyses were performed to survey the effects of different key parameters. Afterward, according to the results of neural network analysis, further experiments were performed to optimize and experimentally validate the desirable parameters. Based on the obtained results the favorable range of shot peening coverage regarding improved mechanical properties and fatigue behavior was identified as no more than 1750% considering Almen intensity of 21 A (0.001 inch). Graphic abstract

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“…For dual-phase steel consisting of ferrite and martensite phases, hydrogen may be trapped at the phase interface, grain boundaries, dislocations, and lattice vacancies [ 17 , 18 ]. The microstructure of some low-carbon steels is mainly composed of a ferrite and fine pearlite phase in which hydrogen can be enriched [ 19 , 20 ]. At present, a lot of studies have been carried out on the HIC behavior of microstructures, but researches on how to quantitatively analyze the relationship between microstructure and hydrogen are in progress.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Tian

Xin

et al. 2021

Materials

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Electrochemical H charging, hydrogen permeation, and hydrogen-induced cracking (HIC) behavior of 690 MPa grade steel substrate and different heat-treatment states (annealed, quenched, normalized, tempered) are investigated by cyclic voltammetry (CV), hydrogen permeation, electrochemical H charging, and slow strain rate tensile test (SSRT). The results show that hydrogen diffuses through the steel with the highest rate in base metal and the lowest rate in annealed steel. The hydrogen-induced cracks in base metal show obvious step shape with tiny cracks near the main crack. The cracks of annealed steel are mainly distributed along pearlite. The crack propagation of quenched steel is mainly transgranular, while the hydrogen-induced crack propagation of tempered steel is along the prior austenite grain boundary. HIC sensitivity of base metal is the lowest due to its fine homogeneous grain structure, small hydrogen diffusion coefficient, and small hydrogen diffusion rate. There are many hydrogen traps in annealed steel, such as the two-phase interface which provides accommodation sites for H atoms and increases the HIC susceptibility.

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Effect of shot peening coverage on hydrogen embrittlement of a ferrite-pearlite steel

Cited by 31 publications

References 69 publications

Modification of Surface and Subsurface Properties of AA1050 Alloy by Shot Peening

Modification of Surface and Subsurface Properties of AA1050 Alloy by Shot Peening

Analysing the Fatigue Behaviour and Residual Stress Relaxation of Gradient Nano-Structured 316L Steel Subjected to the Shot Peening via Deep Learning Approach

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

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