Effects of pulsed laser surface remelting on microstructure, hardness and lead-bismuth corrosion behavior of a ferrite/martensitic steel

Wang, Hao; Yuan, Qian; Chai, Linjiang; Zhao, Ke; Guo, Ning; Xiao, Jun; Yin, Xing; Tang, Bin; Li, Yuqiong; Qiu, Shaoyu

doi:10.1016/j.net.2021.12.030

Cited by 11 publications

(3 citation statements)

References 44 publications

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“…It is seen that while the intensity of α-Fe phase decreases, the intensity of γ-Fe phase and new phases occurred, increase. It is known that molybdenum, one of the new phases formed in the surface structure, is entered into the surface from the consumable electrode material [19]. It is known that the growth of the molybdenum nitride phase and austenite in the analyzed layer results from a deeper penetration of molybdenum and nitrogen into the bulk material and the increased carbon concentration, respectively [16].…”

Section: Resultsmentioning

confidence: 99%

“…The cathode material dramatically influences the chemical composition and the structure of the coating. The consumable electrode (molybdenum or tungsten) is used to cathode plasma accelerators [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This situation facilitates the cathode surface melting, which leads to an increase in mass transfer by a micro-droplet fraction.…”

Section: Introductionmentioning

confidence: 99%

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The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Özbek

Demirkıran

2022

J. Electrochem. Sci. Eng.

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The pulse plasma system is a surface modification method applied to steel samples. In the present study, the effect of the nozzle distance and pulse number parameters were investigated on the modification process. AISI 4140 steel was preferred as the substrate for modification. In this system, the battery capacity and voltage were constant, and, were selected as 800 mF and 3000 V, respectively. The AISI 4140 steel samples were modified by applying 5, 10, and 15 pulses with 40, 50 and 60 mm nozzle distance. The molybdenum consumable electrode was used during the process. The modified surfaces were examined by optical and scanning electron microscope (SEM) and analyzed by X-ray diffractometer (XRD). Vickers microhardness on the cross-section surface of the samples was measured under a load of 50 g for 15 s. Finally, the specimens were exposed to corrosion in 0.5 M NaCl solution. Corrosion tests were realized using the potentiodynamic polarization method. A modified layer on the steel was determined to consist of two layers, the compound layer and the diffusion layer. It was observed that the structure and thickness of the modified layer affect by pulse number and nozzle distance. New phases such as Fe2N, FeN, MoN, and γ-Fe in the modified layer have occurred. The hardness value of the treated sample has risen about 4-5 times than the untreated, depending on applied process parameters. In general, the pulse plasma treatment has improved the corrosion resistance of treated samples. It was observed that while intergranular corrosion has formed on the unmodified surface, pitting corrosion has appeared on the unmodified surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Özbek

Demirkıran

2022

J. Electrochem. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Especially, in the IOZ, alloying elements were found to assemble at grain boundaries (GBs), and their oxidization occurs at GBs with priority [15][16][17]. Therefore, gradient nano-and submicron-structured steel surface layers were produced to increase the amount of GBs to accelerate the diffusion of alloying atoms and quickly form dense oxides to retard the corrosion [18][19][20][21]. Although some Fe-based alloys with nanostructure were tested, the mechanism of the interaction between alloying elements and oxygen at the GB is still not clear, which determines the formation of oxide for improving their corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Elements on the Solution and Diffusion of Oxygen at Iron Grain Boundary Investigated by First-Principles Study

Zhang

Lei

et al. 2023

Metals

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The effects of alloying elements (Si, Cr, Mo) on the solution and diffusion of oxygen (O) atoms at the grain boundary of iron (Fe) Σ5(310)/[001] are investigated by the simulations of ab initio density functional theory (DFT). It is found that Si, Mo and Cr prefer to segregate to the grain boundary, and further affect the solution and diffusion of O atoms at Fe grain boundaries. The segregated Cr promotes the solution of O, while Si and Mo inhibit the solution of O at the grain boundary. Meanwhile, Cr and Si accelerate the diffusion of O, and Mo retards the diffusion of O in the grain boundary. Further analysis indicates that the effects are closely related to the interactions between the alloying elements and O atoms, which are determined by the competition between the distortion of local structure and the charge transfer between local atoms. Finally, the effects of alloying elements on the O concentration distribution near the grain boundary are explored by employing the Langmuir–McLean models. This work not only provides insights into the effects of alloying elements on the solution and diffusion of O at grain boundaries, but also provides parameters of the atomic interactions for the initial oxidation simulation on a large scale, which relates to the growth of oxide in polycrystalline systems with various grain sizes at experimental temperatures.

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Surface microstructures and properties of oxide-reinforced FeCrAl matrix composite coatings prepared by laser cladding on a ferritic-martensitic steel

Shen

Chai

Wang

et al. 2023

Journal of Nuclear Materials

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Effects of pulsed laser surface remelting on microstructure, hardness and lead-bismuth corrosion behavior of a ferrite/martensitic steel

Cited by 11 publications

References 44 publications

The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment

Effects of Alloying Elements on the Solution and Diffusion of Oxygen at Iron Grain Boundary Investigated by First-Principles Study

Surface microstructures and properties of oxide-reinforced FeCrAl matrix composite coatings prepared by laser cladding on a ferritic-martensitic steel

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