Effect of pulse frequency on the morphology, microstructure, and corrosion resistance of high‑nitrogen steel prepared by laser directed energy deposition

Yang, Kun; Wang, Z.D.; Chen, M.Z.; Lan, Huifang; Zhang, Ni

doi:10.1016/j.surfcoat.2021.127450

Cited by 13 publications

(15 citation statements)

References 23 publications

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“…Owing to the existing of laser-on and laser-off stage in the PW laser mode, the constant about time should be defined. K. Yang et al defined a constant about time (δ(t)), as represented by Equation (3), and imported into the heat conduction equation to simulate temperature field in the LMD process with PW laser mode [ 27 ].

where T pulse represents the pulse width and T cycle represents the cycle period of one pulse.…”

Section: Temperature Field Simulation and Thermal Analysismentioning

confidence: 99%

“…Thus, the fish-scale patterns were not observed on the surface morphology of single-track clad that also proofed by the experiments. The pulse frequency of 60 Hz was the critical value which decided whether the molten pool remained continuous or not [ 27 ]. Therefore, the pulse frequency should be larger than the critical value to assure the continuous molten pool.…”

Section: Temperature Field Simulation and Thermal Analysismentioning

confidence: 99%

“…It turned out that that as long as there were sufficient spaces and large enough solidification rates, new branches can continuously grow from the primary dendrite arms. In addition, the SDAS value map was plotted as a function of laser power, scanning speed, and pulse frequency as shown in Figure 6 b [ 27 ].…”

Section: Microstructuresmentioning

confidence: 99%

“…In addition, the micro-porosity, which is related to the entrapment of gas in the molten pool, the unstable of melt flow behavior, and the local overheating of the molten pool, is also an important factor affecting the corrosion preformation of depositions [ 27 ]. However, except for the mentioned above formation mechanism, there will be other basic reason for the formation of micro-porosity during some material is used.…”

Section: Corrosion Behaviormentioning

confidence: 99%

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A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

2022

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Owing to the unparalleled advantages in repairing of high value-add component with big size, fabricating of functionally graded material, and cladding to enhance the surface properties of parts, the laser material deposition (LMD) is widely used. Compared to the continuous wave (CW) laser, the controllability of the laser energy would be improved and the temperature history would be different under the condition of pulse wave (PW) laser through changing the pulse parameters, such as duty cycle and pulse frequency. In this paper, the research status of temperature field simulation, surface quality, microstructural features, including microstructures, microhardness, residual stress, and cracking, as well as corrosion behavior of metallic coating created by pulsed laser material deposition have been reviewed. Furthermore, the existing knowledge and technology gaps are identified while the future research directions are also discussed.

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where T pulse represents the pulse width and T cycle represents the cycle period of one pulse.…”

Section: Temperature Field Simulation and Thermal Analysismentioning

confidence: 99%

Section: Temperature Field Simulation and Thermal Analysismentioning

confidence: 99%

Section: Microstructuresmentioning

confidence: 99%

Section: Corrosion Behaviormentioning

confidence: 99%

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A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

2022

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“…The peculiarities of the direct laser deposition (DLD) process are high temperature gradients, multiple rapid heating and cooling, residual stresses, and structural heterogeneities. The microstructure of materials, such as grain size and morphology, is very sensitive to the influence of temperature fields and directly affects the microhardness and mechanical properties of obtained materials [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Properties of Shipbuilding Steel Obtained by Direct Laser Deposition and Cold Rolling

et al. 2021

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The study of the formation of microstructural features of low-alloy bainite-martensitic steel 09CrNi2MoCu are of particular interest in additive technologies. In this paper, we present a study of cold-rolled samples after direct laser deposition (DLD). We investigated deposited samples after cold plastic deformation with different degrees of deformation compression (50, 60 and 70%) of samples from steel 09CrNi2MoCu. The microstructure and mechanical properties of samples in the initial state and after heat treatment (HT) were analyzed and compared with the samples obtained after cold rolling. The effect on static tensile strength and impact toughness at −40 °C in the initial state and after cold rolling was investigated. The mechanical properties and characteristics of fracture in different directions were determined. Optimal modes and the degree of cold rolling deformation compression required to obtain balanced mechanical properties of samples obtained by additive method were determined. The influence of structural components and martensitic-austenitic phase on the microhardness and mechanical properties of the obtained samples was determined.

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Microstructure Evolution and Mechanical Properties of Ferrite–Austenite Stainless Steel Bimetals Fabricated via Wire Arc Additive Manufacturing

Wang,

Wu,

Sun

et al. 2023

steel research int.

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A bimetallic structure is implemented by wire arc additive manufacturing from 316L austenitic stainless steel to 430 ferritic stainless steel. Microstructure, interface characteristics, and tensile properties of 316L‐430 bimetals are investigated. In 316L/430 bimetals, defects like porosity and cracks are not present. The compositional distribution and microstructure evolution of 316L‐430 bimetallic deposition are significantly impacted by the deposition sequence and heat input. As heat input increases, microstructure evolution of 430 deposited layer is single F → F+ diffusely distributed (Cr, Fe)23C6 → F+ grain internal (Cr, Fe)23C6 → F + M, and 316L deposited layer presents typical austenite + skeletal δ ferrite. Microstructure of 430 deposited layers presents heterogeneous, grain coarsening, and martensite along grain boundaries, resulting in high‐temperature embrittlement. The highest hardness of 316L‐430 bimetals appears on 430 sides near the interface. The tensile strength of 430/316L bimetals is greater than that of 316L/430, and the tensile specimens exhibit brittle fracture.

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Effect of pulse frequency on the morphology, microstructure, and corrosion resistance of high‑nitrogen steel prepared by laser directed energy deposition

Cited by 13 publications

References 23 publications

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

Structure and Mechanical Properties of Shipbuilding Steel Obtained by Direct Laser Deposition and Cold Rolling

Microstructure Evolution and Mechanical Properties of Ferrite–Austenite Stainless Steel Bimetals Fabricated via Wire Arc Additive Manufacturing

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