Enhancement of the strength-toughness balance in a quenched laser-additively-manufactured low alloy mild steel: Effect of grain refinement and nanotwin bundle formation

Zhang, W.; Dong, Zhihong; Shang, Xin; Chen, Shenggui; Zhang, L.J.; Xiao, Peng

doi:10.1016/j.msea.2022.144488

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…On the contrary, no sub-grains were observed in the non-hydrogenated material (Figure 7a). The toughening effects of microstructural grain refinement are generally well-known and have been frequently reported in numerous sources in the literature, e.g., in [48][49][50][51][52][53][54][55], for various classes of structural metallic materials. However, in the case of the current investigation, it has been supposed that hydrogen charging might cause just the sub-grain visualization instead of their formation by induced hydrogen.…”

Section: Effect Of Hydrogen Charging On Cvn Impact Toughnessmentioning

confidence: 99%

The Effects of Electrochemical Hydrogen Charging on Charpy Impact Toughness and Dry Sliding Tribological Behavior of AISI 316H Stainless Steel

et al. 2023

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In this work, solution-annealed AISI 316H grade austenitic stainless steel was studied in terms of investigating the electrolytic hydrogen charging effects on the resulting Charpy impact toughness and dry sliding tribological behavior. Conventional Charpy impact bending tests were employed to study the mechanical response of the investigated material to dynamic loading conditions, whereas dry linear sliding tribological tests were used to study material friction and wear behavior. The obtained mechanical and tribological properties were correlated with corresponding fracture and tribological mechanisms, which were determined from morphological observations of fracture surfaces and tribological tracks. The applied testing procedures were individually carried out for the non-hydrogenated, hydrogen-charged, and dehydrogenated material conditions. The observed changes in individual properties due to applied hydrogen charging were rather small, which indicated the good resistance of solution-annealed AISI 316H steel against material degradation in currently used electrolytic hydrogenation conditions.

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Section: Effect Of Hydrogen Charging On Cvn Impact Toughnessmentioning

confidence: 99%

The Effects of Electrochemical Hydrogen Charging on Charpy Impact Toughness and Dry Sliding Tribological Behavior of AISI 316H Stainless Steel

et al. 2023

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“…Therefore, the comprehensive mechanical properties of the parts are significantly improved. 2 Based on the above characteristics, laser quenching can effectively solve the defects of large residual stress, thermal deformation, coarse grains, and uneven structure of the workpiece, which are inevitable in other heat treatment methods. Gear is one of the most crucial mechanical components, and industrial gears usually operate under high-speed and heavy-duty conditions, which cause severe impact wear and may lead to tooth breakage and fatigue pitting failure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of laser irradiation process parameters for 40Cr steel based on back propagation neural network and genetic algorithm

Chang

Deng

Sun

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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40Cr is a significant material in the manufacturing of gears. However, this process is plagued by uneven distribution of quenching layers and excessive residual stress, leading to a decline in the precision of the workpiece, deformation, and cracking. Relying solely on the trial-and-error method in experiments is inadequate for effectively revealing the evolution mechanism of the laser quenching process. This approach is detrimental to improving research and development efficiency. In this study, a multi-field coupled numerical model for the multi-track overlapping laser quenching of the 40Cr gear steel is established. This model quantitatively reveals the coupling evolution laws of the temperature field, stress field, and phase transformation field during the laser quenching. The focus is on calculating the size of the tempering zone under different overlapping rates and conducting correlation analysis between parameters. Based on the artificial neural networks and genetic algorithms, the width and depth of the tempering zone are selected as target values for parameter optimization. The aim is to find the nonlinear relationship between the laser power, spot diameter, scanning speed, laser overlapping rate, and the size of the tempering zone, which can accurately predict the size of the tempering zone. The material microstructure of 40Cr gear steel was characterized by the scanning electron microscope, microhardness tester and friction and wear tester. The results show that the training error and testing error of the output parameters in genetic algorithm optimized back propagation network can accurately predict the size of the tempering zone. It is found that the higher the lap rate, the more uniform the hardness of the phase transformation hardening layer surface, and the tempering softening zone becomes larger. The parts surface is easy to produce defects, which can provide a theoretical basis for optimizing the laser quenching process parameters.

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Ultra-high temperature oxidation resistant refractory high entropy alloys fabricated by laser melting deposition: Al concentration regulation and oxidation mechanism

Zhou,

Peng,

Lü

et al. 2023

Corrosion Science

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Enhancement of the strength-toughness balance in a quenched laser-additively-manufactured low alloy mild steel: Effect of grain refinement and nanotwin bundle formation

Cited by 4 publications

References 33 publications

The Effects of Electrochemical Hydrogen Charging on Charpy Impact Toughness and Dry Sliding Tribological Behavior of AISI 316H Stainless Steel

The Effects of Electrochemical Hydrogen Charging on Charpy Impact Toughness and Dry Sliding Tribological Behavior of AISI 316H Stainless Steel

Optimization of laser irradiation process parameters for 40Cr steel based on back propagation neural network and genetic algorithm

Ultra-high temperature oxidation resistant refractory high entropy alloys fabricated by laser melting deposition: Al concentration regulation and oxidation mechanism

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