Analysis of microstructure and wear performance of SiC clad layer on SKD61 die steel after gas tungsten arc welding

Lin, Yu-Chi; Chen, Han-Ming; Chen, Yong‐Chwang

doi:10.1016/j.matdes.2013.01.007

Cited by 26 publications

(13 citation statements)

References 29 publications

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“…Additionally, the formation of fine eutectic-like structures was observed in the interdendritic regions, as shown in Figure 8a,b. Based on the results of thermodynamic calculations (Section 3.2) that predicted a ternary eutectic reaction at the final solidification stage under non-equilibrium conditions, it is reasonable to assume that the above fine eutectic-like structures were ternary eutectic α-Fe/Fe 3 C/Fe 8 Si 2 C. This assumption is also supported by the fact that the morphology of the observed ternary eutectic is consistent with that previously reported for the Fe-C-Si alloy system [23]. The above results indicate a good agreement between the experimental results and those that were calculated under the Scheil condition.…”

Section: Thermodynamic Calculationssupporting

confidence: 82%

Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

et al. 2020

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The thermal conditions in the molten pool during the laser surface melting of ductile cast iron EN-GJS-700-2 were estimated by using infrared thermography and thermocouple measurements. The thermal data were then correlated with the microstructure of the melted zone. Additionally, the thermodynamic calculations of a Fe-C-Si alloy system were performed to predict the solidification path of the melted zone. It was found that increasing the cooling rate during solidification of the refined ledeburite eutectic but also suppressed the martensitic transformation. A continuous network of plate-like secondary cementite precipitates and nanometric spherical precipitates of tertiary cementite were observed in regions of primary and eutectic austenite. The solidification of the melted zone terminated with the Liquid → γ-Fe + Fe3C + Fe8Si2C reaction. The hardness of the melted zone was affected by both the fraction of the retained austenite and the morphology of the ledeburite eutectic.

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Section: Thermodynamic Calculationssupporting

confidence: 82%

Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

et al. 2020

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“…The structure was divided into three parts after quenching, including hard zone, transition zone, and substrate zone. The distribution of carbides in the hard zone decreased obviously because the high temperature of laser surface treatment dissolved surface carbides in the base, the hard zone had the highest hardness value, the transition zone and substrate zone were tempered martensite structure and fine carbides [8,9,10] The mechanical properties of medium carbon steel AISI 1045, chrome-molybdenum steel AISI 4140, and nickel-chromium-molybdenum steel AISI 4340 after laser surface treatment. The experimental results showed that the hardness of medium carbon steel AISI 1045 was increased from 316HV to 755HV, the surface hardness was increased by 138%.…”

Section: Introductionmentioning

confidence: 99%

Development Research on Integrating CNC Machine Tool with Plasma for On-line Surface Heat Treatment

Chen¹,

Wang²

2021

Preprint

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The mechanical engineering requires heat treatment after rough machining to reach the mechanical strength, but the heat treatment can induce workpiece deformation, so that the workpiece cannot be reworked. In this study, the plasma was integrated with a lathe, and the on line heat treatment was performed to achieve the mechanical strength and hardness, so as to reduce the machining process and handling. However, for on line heat treatment, it is important to study the machine and plasma parameters of the lathe and plasma, and the research method is used eventually to optimize the process, reduce the machining cost and machining error. The variable factors in surface on line real-time heat treatment are revolution, feed rate and current, the objective function is the hardness of mechanical properties. In the screening experiment, the interaction of factors was discussed using full factorial experiment. The Central Composite Design was combined with the Lack-of-Fit test for optimization experiment, the R2 coefficient was used to determine whether the regression model is appropriate. The optimum parameters were derived from the contour diagram and response surface diagram. The experimental results show that the significant factors include revolution, feed rate and current, the optimum parameters include revolution 168rpm, feed rate 0.068mm/rev and current 86A. The experimental results of optimum parameters show that the surface hardness is increased from 306HLD to 806HLD, the surface hardening effect is enhanced by 163%, so the on line real-time heat treatment equipment has a best hardening effect.

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“…In the molten pool, metallurgical reactions occur by means of the contacting of the raw materials, and the reinforced particles are in-situ synthesized during the fabrication process. In-situ particle reinforced composite coatings have many advantages over ex-situ particle reinforced coatings, such as uniform dispersion of reinforcements in the metal matrix, finer grain size, and that they are more cost-effective [14][15][16][17]. It is worth mentioning that the interface between the reinforcements and the metal matrix is stable and defect-free resulting in strong interfacial bonding.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Behavior of In-Situ NbC Reinforced Composite Coatings

et al. 2020

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In the present study, plasma spray welding was used to prepare an in-situ niobium carbide (NbC) reinforced Ni-based composite coating on the low carbon steel, and the phase composition and the microstructure of the composite coatings were studied. The wear resistance and the wear mechanism of the composite coatings were also researched by the wear tests. The results showed that the main phases of the composite coating were NbC, γ-Ni, Cr23C6, Ni3Si, CrB, Cr5B3, Cr7C3 and FeNi3. A number of fine in-situ NbC particles and numerous chromium carbide particles were distributed in the γ-Ni matrix. The increase in the mass fraction of Nb and NiCr-Cr3C2 could lead to the increase in NbC particles in the composite coatings. Due to the high hardness of NbC and chromium carbides, the micro-hardness and the wear resistance of the composite coatings were advanced. The composite coating with the powder mixtures of 20% (Nb + NiCr-Cr3C2) and 80% NiCrBSi had the highest micro-hardness and the best wear resistance in this study. The average micro-hardness reached the maximum value 1025HV0.5. The volume loss was 39.2 mm3, which was merely 37% of that of the NiCrBSi coating and 6% of that of the substrate under the identical conditions.

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Analysis of microstructure and wear performance of SiC clad layer on SKD61 die steel after gas tungsten arc welding

Cited by 26 publications

References 29 publications

Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

Development Research on Integrating CNC Machine Tool with Plasma for On-line Surface Heat Treatment

Microstructure and Wear Behavior of In-Situ NbC Reinforced Composite Coatings

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