Effect of laser power on gradient microstructure of low-alloy steel built by laser melting deposition

Kang, Xueliang; Dong, Shiyun; Wang, Hongbin; Shen, Yan; Liu, Xiaoting; Xu, Bin

doi:10.1016/j.matlet.2019.127073

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…Nevertheless, the PDAS decreased from 25.23 µm to 7.16 µm when the scanning speed increased from 5 mm/s to 15 mm/s. These results were in line with prior studies on the influence of laser power and scanning speed on the microstructure [20]. The size of the martensite and lower bainite increased during the process of low alloy steel fabrication through laser melting deposition.…”

Section: Microstructuresupporting

confidence: 91%

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Martínek

Peng

et al. 2023

Coatings

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Cr5Mo steel with high thermal strength is frequently applied as the material for hydrocracking furnace tubes. Nonetheless, Cr5Mo tubes are prone to material failure in a high-temperature environment, threatening production safety. Considering that the IN718 nickel-base superalloy has favorable high-temperature oxidation resistance, the IN718 coating was fabricated on Cr5Mo substrate through laser cladding. The effect of process parameters on the high-temperature oxidation resistance of laser cladding IN718 coating was investigated. The results confirm that laser power and scanning speed affected the eutectic quantity precipitation of this layer, and the eutectic quantity precipitation was positively correlated with the mass gain of the coating. The high-temperature behavior of the coating could be divided into surface oxidation, intergranular corrosion, and material shedding. The scanning speed has a more significant impact on the high-temperature oxidation resistance. When the scanning speed is 15 mm/s, cracks originating in the heat-affected zone could exert a negative impact on the high-temperature oxidation resistance.

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Section: Microstructuresupporting

confidence: 91%

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Martínek

Peng

et al. 2023

Coatings

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“…There are various effective processing parameters in the LMD process (such as laser power and scanning speed) that must be considered to achieve a favorable cohesion and metallurgical bonding between the deposited layer and BM [15,[23][24][25]. Moradi et al [11] indicated that the lower grain size, lower distortion, higher microhardness, and higher stability can be achieved by employing a unidirectional scanning pattern in direct laser metal deposition of Stellite 6 powders on DIN 1.2714 hot work tool steel.…”

Section: Introductionmentioning

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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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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Microstructure, mechanical properties and machinability of 316L stainless steel fabricated by direct energy deposition

Ding

Zou

Wang

et al. 2023

International Journal of Mechanical Sciences

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Effect of laser power on gradient microstructure of low-alloy steel built by laser melting deposition

Cited by 12 publications

References 8 publications

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

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

Microstructure, mechanical properties and machinability of 316L stainless steel fabricated by direct energy deposition

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