Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

Liu, Xiubo; Pang, Ming; Guo, Jing; Yu, Gang

doi:10.1016/j.jallcom.2007.07.079

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…In the joining of dissimilar alloys, laser welding method provides some advantages such as high energy density, rapid heating/cooling velocity and accessibility to the heating zone [20,21]. Specially, the laser welding-brazing method to attach metallurgical non-fitting partners to each other can suppress effectively the growth of brittle intermetallic compounds [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Joining mechanism of Ti/Al dissimilar alloys during laser welding-brazing process

Chen

et al. 2011

Journal of Alloys and Compounds

197

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Section: Introductionmentioning

confidence: 99%

Joining mechanism of Ti/Al dissimilar alloys during laser welding-brazing process

Chen

et al. 2011

Journal of Alloys and Compounds

197

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“…Fathy et al [6] reported that liquid to solid volume ratio should be kept higher than 5:1 to successfully fabricate Babbitt-steel bimetallic composite at low pouring temperature with the assistance of Sn-Pb interlayer. Similarly, Liu et al [26] found that the effective interfacial bonding could be achieved using a liquid-to-solid volume ratio of 8:1 that mainly depends on the imported heat energy of the poured liquid metal. One of the previous investigations [4] is in good agreement with the above findings that the liquid-to-solid volume ratios of 5:1 and 6.5:1 are not enough to partially remelt the tin + tin oxide layer (that formed during atmosphere preheating) on the surface of tinned solid steel, resulting in the appearance of an unboned interface area.…”

Section: Effect Of Volume Ratio Of Liquid-to-solid On the Interfacialmentioning

confidence: 95%

Development and Optimization of Tin/Flux Mixture for Direct Tinning and Interfacial Bonding in Aluminum/Steel Bimetallic Compound Casting

et al. 2020

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Interfacial bonding highly affects the quality of bimetallic bearing materials, which primarily depend upon the surface quality of a solid metal substrate in liquid–solid compound casting. In many cases, an intermediate thin metallic layer is deposited on the solid substrate before depositing the liquid metal, which improves the interfacial bonding of the opposing materials. The present work aims to develop and optimize the tinning process of a solid carbon steel substrate after incorporating flux constituents with the tin powder. Five ratios of tin-to-flux—i.e., 1:1, 1:5, 1:10, 1:15, and 1:20—were used for tinning process of carbon steel solid substrate. Furthermore, the effect of volume ratios of liquid Al-based bearing alloy to solid steel substrate were also varied—i.e., 5:1, 6.5:1 and 8.5:1—to optimize the microstructural and mechanical performance, which were evaluated by interfacial microstructural investigation, bonding area determination, hardness and interfacial strength measurements. It was found that a tin-to-flux ratio of 1:10 offered the optimum performance in AlSn12Si4Cu1/steel bimetallic materials, showing a homogenous and continuous interfacial layer structure, while tinned steels using other percentages showed discontinuous and thin layers, as in 1:5 and 1:15, respectively. Furthermore, bimetallic interfacial bonding area and hardness increased by increasing the volume ratio of liquid Al alloy to solid steel substrate. A complete interface bonding area was achieved by using the volume ratio of liquid Al alloy to solid steel substrate of ≥8.5.

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“…The substrates and coating materials used in this experiment were of AISI 4130 steel and Stellite 6, respectively; the chemical compositions of the two materials are shown in Table 1. AISI 4130 steel is one type of high-strength low-alloy steel [29], commonly used in the manufacture of crankshafts for power plant [14], for automotive application [15], shaft of turbocharger [16], and aircraft components [17]. Round bar of AISI 4130 steel, with a diameter of 5.5 mm, was laser clad with Stellite 6 powder with the powder size range of 45-150 lm.…”

Section: Laser Cladding and Microstructural Examinationmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties at the Interface Region of Laser-Clad Stellite 6 on Steel Using Nanoindentation

Hutasoit

Wang

Cottam

et al. 2013

Metallogr. Microstruct. Anal.

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The interface area in laser cladding, microstructures and mechanical properties of which determine the structural integrity of the laser-deposited coating, consists of two distinctive zones: the dilution and heataffected zones (HAZs). The dilution region is the region where melted substrate forms a mixture with coating material and possesses microstructure similar to the coating. The HAZ is the region that lies in the substrate but possesses different microstructures compared with original substrate due to heat transfer from melt pool during processing. There are limited data available on mechanical properties of the dilution and HAZ and, in this study, the mechanical properties of the two regions have been evaluated using nanoindentation. This testing technique has the ability to resolve the mechanical properties at fine spacings, unlike microhardness testing and conventional mechanical testing. Stellite 6 powder was deposited onto a round bar AISI 4130 steel using a continuous wave Nd:YAG laser. The effect of laser cladding process on the microstructure, hardness, and elastic modulus of the coating, at the interface has been examined by nanoindentation testing. The elastic modulus of the substrate measured was found to be 198.76 ± 24.96 GPa, which is in a good agreement with the standard elastic modulus of AISI 4130 reported in literature. For the laser clad specimen, dilution area showed elastic modulus of 192.62 ± 7.67 GPa, slightly higher than the average elastic modulus of the HAZ, 189.94 ± 14.75. This is due to the dilution area containing a mixture mainly of Fe, Cr and Co. The increased level of Fe in this dilution area leads the tendency of this region to behave as substrate.

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Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

Cited by 13 publications

References 19 publications

Joining mechanism of Ti/Al dissimilar alloys during laser welding-brazing process

Joining mechanism of Ti/Al dissimilar alloys during laser welding-brazing process

Development and Optimization of Tin/Flux Mixture for Direct Tinning and Interfacial Bonding in Aluminum/Steel Bimetallic Compound Casting

Evaluation of Microstructure and Mechanical Properties at the Interface Region of Laser-Clad Stellite 6 on Steel Using Nanoindentation

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