Process, microstructure and microhardness of GH3039 superalloy processed by laser metal wire deposition

Li, Qingqing; Chen, Jie; Wang, Xudong; Liu, Yang; Jiang, Kun; Yang, Shiyu; Liu, Yong

doi:10.1016/j.jallcom.2021.160330

Cited by 8 publications

(3 citation statements)

References 47 publications

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“…Based on Table 4, it can be observed that D and ζ reduced with the increment of scanning speed, while β rose. The β is regarded as a characteristic tied to the W and H of layers; raising the scanning speed conspicuously increased H and slightly decreased W, but the greater extent of change in H led to the increase in β, which is following the previous studies stating that the effect of laser scanning speed on the layer height is comparatively more notable than its effect on the width [38]. Then, a comparison of Figure 3a,c, Figure 3b,d, Figure 3e,g, and Figure 3f,h respectively illustrates the impact of focal length on the geometrical attributes.…”

Section: Geometrical Attributes and Microstructure Of Layerssupporting

confidence: 59%

“…During LMD, a high dilution provides a large heat-affected zone (HAZ) and a high probability of cracking [35,36], while too low dilution may lead to inadequate bound. The wetting angle, also called the bead root angle, is well-known as another eminent quality indicator in LMD [37], which can prevent porosity and offer a fully dense deposited layer [38]. The ideal deposition produces a clad with a synthesis of a minimum dilution and a maximum aspect ratio as well as a moderate wetting angle.…”

Section: Geometrical Attributes and Microstructure Of Layersmentioning

confidence: 99%

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Effect of Laser Metal Deposition Parameters on the Characteristics of Stellite 6 Deposited Layers on Precipitation-Hardened Stainless Steel

et al. 2021

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Laser metal deposition (LMD) is one of the manufacturing processes in the industries, which is used to enhance the properties of components besides producing and repairing important engineering components. In this study, Stellite 6 was deposited on precipitation-hardened martensitic stainless steel (17-4 PH) by using the LMD process, which employed a pulsed Nd:YAG laser. To realize a favor deposited sample, the effects of three LMD parameters (focal length, scanning speed, and frequency) were investigated, as well as microstructure studies and the results of a microhardness test. Some cracks were observed in the deposited layers with a low scanning speed, which were eliminated by an augment of the scanning speed. Furthermore, some defects were found in the deposited layers with a high scanning speed and a low frequency, which can be related to the insufficient laser energy density and a low overlapping factor. Moreover, various morphologies were observed within the microstructure of the samples, which can be attributed to the differences in the stability criterion and cooling rate across the layer. In the long run, a defect-free sample (S-120-5.5-25) possessing suitable geometrical attributes (wetting angle of 57° and dilution of 25.1%) and a better microhardness property at the surface (≈335 Hv) has been introduced as a desirable LMDed sample.

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Section: Geometrical Attributes and Microstructure Of Layerssupporting

confidence: 59%

Section: Geometrical Attributes and Microstructure Of Layersmentioning

confidence: 99%

Effect of Laser Metal Deposition Parameters on the Characteristics of Stellite 6 Deposited Layers on Precipitation-Hardened Stainless Steel

et al. 2021

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“…Figure 6b shows the measured and predicted values of the aspect ratio. It can be noticed that the experimental values are more centrally distributed on both sides of the fitted straight line, which also indicates the accuracy of the model [23]. In summary, the insignificant factors in the model were removed to develop a quadratic regression model for the effect of process parameters on the aspect ratio.…”

Section: Response Surface Analysis For Aspect Ratiomentioning

confidence: 97%

Multi-Objective Optimization of Process Parameters in Laser DED Ni-Based Powder on Steel Rail Using Response Surface Design

Li,

Yang,

Chen

et al. 2024

Coatings

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With the rise of global industrialization, the requirements for the operating speed and carrying capacity of high-speed trains are increasingly higher. Because the wear and tear of rails gradually increases during the running of high-speed trains, strengthening or repairing rail surfaces is of paramount significance. Laser-directed energy deposition (DED) exhibits significant advantages in improving surface hardness, corrosion resistance, and abrasion resistance. Because of the multiple interacting optimization objectives, the development of a multi-objective optimization method for process parameters is significant for improving DED deposition quality. Response surface design employs multivariate quadratic regression equations to fit the functional relationship between the factors and the responses, which can be employed to find the optimal process parameters and solve multivariate problems. This study develops a multi-objective optimization model with response surface design and 2D process mappings to visually analyze the effects of scanning speed, laser power, and powder feed rate on aspect ratio, dilution rate, and microhardness. The optimal combination of process parameters for Ni-based alloys on U71Mn rail is a laser power of 431 W, a scanning speed of 5.34 mm/s, and a powder feed rate of 1.03 r/min. In addition, a multi-physics field finite element model is developed to analyze the evolution mechanism of the microstructure from the bottom to the top of the single track. This study can provide theoretical and technical support for the surface strengthening or repair of U71Mn rail.

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High deposition rate powder- and wire-based laser directed energy deposition of metallic materials: A review

Zuo

Sui

et al. 2022

International Journal of Machine Tools and Manufacture

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Process, microstructure and microhardness of GH3039 superalloy processed by laser metal wire deposition

Cited by 8 publications

References 47 publications

Effect of Laser Metal Deposition Parameters on the Characteristics of Stellite 6 Deposited Layers on Precipitation-Hardened Stainless Steel

Effect of Laser Metal Deposition Parameters on the Characteristics of Stellite 6 Deposited Layers on Precipitation-Hardened Stainless Steel

Multi-Objective Optimization of Process Parameters in Laser DED Ni-Based Powder on Steel Rail Using Response Surface Design

High deposition rate powder- and wire-based laser directed energy deposition of metallic materials: A review

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