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steel_11 | However, Wang [14] indicated that a detailed description of both the chemical reactions and the ionic transport was not included in it [13]. | [
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steel_11 | Through the use of interaction | [
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steel_11 | Materials 2019, 12, 2130; doi:10.3390/ma12132130 www.mdpi.com/journal/materials Materials 2019, 12, 2130 2 of 13 | [
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steel_11 | function to simulate the effect of the corrosion potential and corrosion current density on the corrosion process, Xu [15] developed an FE model for the simulation of the mechanoelectrochemical effect of pipeline corrosion. | [
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steel_11 | Because the fatigue strength of the metallic alloys decreases differently under the different corrosion depths and stress amplitudes [16], Pidaparti [17] established a new FE model to investigate the stress state around corrosion pits. | [
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steel_11 | Through the use of the damage tolerance method to predict the corrosion fatigue life for 7075-T6 stainless steel, Huang [18] indicted that the nucleation time of pits and the material constant of crack propagation can affect the residual fatigue life of stainless steel significantly. | [
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steel_11 | On the basis of [16–18], Zheng [19] proposed that the decrease of fatigue life depends on the pre-corroded time and the size of pre-corrosion pits. | [
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steel_11 | The stress concentration caused by corrosion pits can dramatically influence the basic macroscopic mechanical properties of a steel [20]. | [
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steel_11 | Based on experiment results, an FE model is conducted to investigate stress distribution around corrosion pits, and regression formula of the stress intensity factor varying with corrosion pits in different size parameters is then derived. | [
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steel_11 | Subsequently, by coupling the regression formula with the Paris formula [25], the fatigue performance is predicted by the FE method and then compared with experimental tests. | [
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steel_11 | 2.Materials and Methods | [
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steel_11 | 2.1. Material and Specimen Preparation | [
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steel_11 | To better understand the stress intensity factor varying with corrosion pits in different size parameters and to accurately depict the residual fatigue life of 42CrMo steel subject to corrosion, it is necessary to quantitatively investigate the effects of pre-corrosion levels on the fatigue behavior of 42CrMo steel. | [
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steel_11 | Experimental specimens were fabricated using the 42CrMo steel (American grade: AISI 4140), which was provided by Baowu Steel Company (Wuhan, China). | [
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steel_11 | Specimens were manufactured in the form of flat bare sheets with a thickness of 6 mm by wire cutting machine, the sizes of specimens are provided in Figure 1. | [
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steel_11 | The chemical composition was measured using an FLS980-stm Edinburgh fluorescence spectrometer (Edinburgh Instruments Ltd., Livingston, UK). | [
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steel_11 | A comparison of the measured chemical composition of 42CrMo specimens and the standard of GB/T3077-2015 (the national standard of the People’s Republic of China for alloy structural steel) for 42CrMo steel is presented in Table 1. | [
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steel_11 | It can be seen from Table 1 that the chemical composition of the specimens used in this study meets the requirement of the national standard. | [
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steel_11 | Figure 1. Schematic diagram of specimen sizes (mm). | [
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steel_11 | Table 1. A comparison of the measured chemical composition of 42CrMo specimens and the standard of GB/T3077-2015 for 42CrMo steel (wt.%). | [
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steel_11 | Twelve smooth samples were numbered and divided into four groups. | [
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steel_11 | The accelerated neutral salt spray corrosion experiment was established to achieve the pre-corroded steel plates based on the standard of JIS H 8502.5 [26]. | [
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steel_11 | A schematic drawing of the sample preparation and the pre-corroded experiment procedure is shown in Figure 2. | [
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steel_11 | The sample preparation was carried out in five steps: (1) samples were manufactured in the form of flat bare sheets with the dimensions in Figure 1 by wire cutting machine; (2) the surface of each sample was burnished by the 1000 grit abrasive paper to dispel burrs; (3) samples were rinsed in distilled water; (4) samples were degreased through the use of acetone solvent; (5) all surfaces of samples were rinsed with deionized water and dried by a blower for the pre-corroded experiment. | [
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steel_11 | In this study, the pre-corroded experiment procedure can be devised as four main steps: 1) the pure NaCl crystals of 50 g were weighed by an electronic balance and poured into one liter of deionized water and stirred with glass rod at an ambient temperature of (25 ± 1 °C) for 5 min; 2) four groups of numbered samples were alternately immersed in 5% NaCl solution at an ambient temperature of (25 ± 1 °C) for 0 h, 24 h, 48 h, and 96 h, respectively; 3) the corrosion products were removed by membrane removal solution (prepared with 100 mL HCl, 100 mL deionized water and 0.6 g C6H12N4); 4) all surfaces of samples were rinsed with deionized water and dried by a blower for pit depth measurement. | [
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steel_11 | 2.2. Pre-Corrosion Pit Measurements and Fatigue Test | [
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steel_11 | On the basis of the experiment test, a single semi-elliptical pit model was conducted, and the symmetry plane of the flat sheet and refined mesh around the pit are shown in Figure 3. | [
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steel_11 | The sweeping method [31] was used to generate the mesh in the integral region and the singularity of the mesh was controlled by the mesh regeneration technique [32]. | [
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steel_11 | The use of the above techniques [31,32] with local refinement and appropriate local mesh density can improve the precision of the calculation. | [
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steel_11 | 3.Results and Discussion | [
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steel_11 | 3.1.Corrosion Surface Characterization | [
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steel_11 | When the 42CrMo specimens were immersed in NaCl solution, the Cl element in the solution adhered to the surface of specimens and reacted with the Fe2+ in the metal to form a soluble clathrate, which resulted in the anodic dissolution of the metal surface and the formation of corrosion pits. | [
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steel_11 | Figure 4. Corrosion surface characterization: (a) pre-corroded for 0 h; (b) pre-corroded for 24 h; (c) pre-corroded for 48 h; and (d) pre-corroded for 96 h. | [
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steel_11 | According to Figure 4, corrosion surface characterization can be clearly observed and the obvious corrosion pits after pre-corrosion can be found within the crack source area in each diagram. | [
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steel_11 | As shown in Figure 4a, there was no corrosion pit on the surface of specimens without pre-corrosion. | [
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steel_11 | With the pre-corrosion treatment, Figure 4b shows that there were local micro-pits and pits distributed densely. | [
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steel_11 | With the increase of pre-corroded time, Figure 4c,d shows that corrosion pits became larger since the small pits were interconnected to form larger corrosion pits. | [
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steel_11 | A series of electrochemical corrosion processes occurred when the specimen was immersed in the NaCl solution. | [
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steel_11 | In this study, the corrosion process can be generally divided into two stages: 1) the initiation of the pits stage and 2) the pit development stage. | [
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steel_11 | In the first stage, adsorption and agglomeration of chloride ions took place at certain weak sites and the corrosion pits formed. | [
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steel_11 | In the second stage, the pits developed as a result of the anodic dissolution of the metal [34–36]. | [
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steel_11 | Thus, the small pits were interconnected to form larger corrosion pits. | [
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steel_11 | To obtain the effect of the stress distribution around corrosion pits on the stress intensity factor and the residual fatigue life of corroded steel, the size of pre-corroded pits should be accurately assessed and the depth of pre-corroded pits can be measured by a surface profiler. | [
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steel_11 | The schematic diagram of pre-corrosion pits under the pre-corroded times 24 h, 48 h, and 96 h is shown in Figure 5. | [
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steel_11 | 3.2.Fatigue Test Results and Discussion | [
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steel_11 | Pre-corrosion not only reduces residual fatigue life, but also leads to the change of the stress intensity factor. | [
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steel_11 | Under the cyclic load with a frequency of 10 Hz, the local stress concentration around the corrosion pits accelerated the process of fatigue damage and resulted in the reduced fatigue life of the specimen. | [
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steel_11 | Three constant stress levels (100 MPa, 200 MPa, and 300 MPa) were carried out to pre-corroded specimens for 0 h, 24 h, 48 h, and 96 h. | [
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steel_11 | Table 2 shows that the fatigue life decreased obviously with the increase of pre-corroded time under the same constant stress level. | [
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steel_11 | Although the external load is normally invariant in practical engineering structures and residual fatigue life usually depends on corrosion surface condition and the nominal stress level, the raised nominal stress caused by the reduction of the cross-sectional area of components due to corrosion still decreases the fatigue life of steel [39]. | [
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steel_11 | After fatigue testing, the fracture surface of the corroded specimens under 100 MPa was observed by SEM, and the results are shown in Figure 6. | [
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steel_11 | Figure 6. The fracture surface of the corroded specimens under 100 MPa: (a) pre-corroded for 0 h; (b) pre-corroded for 24 h; (c) pre-corroded for 48 h; and (d) pre-corroded for 96 h. | [
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steel_11 | Figure 6a shows the fracture surface of the non-corroded specimen under the constant stress of 100 MPa, and it can be seen that the crack propagated along grain boundaries. | [
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steel_11 | Figures 6b–d reveal that the crack originated at the tip of the corrosion pit and propagated along the grain boundaries, and the white highlight area phenomena was caused by the deposition of corrosive elements. | [
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steel_11 | Due to the existence of corrosion defects, stress concentration occurred around the sharp intrusion at the pit bottom and accelerated the process of fatigue damage. | [
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steel_11 | 3.3. FE Investigations | [
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steel_11 | Based on Equations (1)–(3), ABAQUS was applied to compute the stress intensity factor corresponding to different corrosion pit morphology characteristics, which were depicted in the previous section. | [
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steel_11 | The same material properties and loading conditions in Section 2.2 were applied to the FE models, and the computed stress distributions around the crack tip are shown in Figure 7. | [
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steel_11 | The ashy area in Figure 7 represents the yielding zone in specimens. | [
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steel_11 | From Figure 7, it can be seen that, under the same pre-corroded time, the yielding zone increased with the increase of applied loads through the transverse comparison. | [
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steel_11 | Under the same applied loads, it can be seen that the yielding zone increased with the increase of the size of pre-corrosion pits. | [
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steel_11 | Moreover, the FEM investigations revealed that the rate of crack extension accelerated when the crack length increased. | [
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steel_11 | By the adoption of Equations (2) and (3), the stress intensity factor around the crack tip in the process of crack propagation for non-corroded specimens can be calculated and compared with the stress intensity factor that was computed by ABAQUS software to validate the accuracy of the FE simulation results. | [
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steel_11 | A comparison of the stress intensity factor by theoretical Paris formula and FE simulation is shown in Figure 8. | [
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steel_11 | Figure 8. Comparison of the stress intensity factor by theoretical Paris formula and FE simulation. | [
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steel_11 | The maximum percentage error of the calculated stress intensity factor between the theoretical Paris formula and the FEM is 4.7%, which indicates that the theoretical calculation agreed well with the simulated results. | [
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steel_11 | Through the integration of the ashy area around the crack tip in Figure 7, the stress intensity factor of the crack tip for pre-corroded specimens can be obtained and the relationship between the stress intensity factor at the crack tip and the depth of the pre-corrosion pits can be established. | [
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Subsets and Splits