Microstructure and mechanical properties of Cr12MoV by ultrasonic vibration-assisted laser surface melting

Zhou, Jing; Xu, Jiale; Huang, Shu; Hu, Zengrong; Meng, Xiankai; Fan, Yujie

doi:10.1080/02670836.2016.1273989

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…As can be seen from reference [19] that the fine and uniform distributed microstructure is beneficial for the improvement of microhardness. The higher the microhardness is, the better the wear resistance will be.…”

Section: Resultsmentioning

confidence: 99%

Laser cladding Co-based coating coupled with electromagnetic/ultrasonic compound energy field

Wang

et al. 2023

Materials Science and Technology

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Co-based coatings were fabricated by laser cladding coupled with electromagnetic/ultrasonic compound energy field. The microstructural evolution and wear resistance were investigated. The experiment results indicate that the number of coarse dendrites is continuously reduced and that of fine grains is gradually increased as the energy field changes from single to compound energy field. The compound energy field makes the cladding layer microstructure more uniform and refined, leading to the cladding layer showing the best wear resistance, in terms of highest microhardness (531.95 Hv0.2), lowest friction coefficient (0.259), minimum wear rate (8.96 × 10−2mm3 (Nm)−1). The solidification structure of cladding layer can be effectively controlled by applying an external physical field in the process of laser cladding with obvious improvements in mechanical properties, especially for the compound energy field.

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Section: Resultsmentioning

confidence: 99%

Laser cladding Co-based coating coupled with electromagnetic/ultrasonic compound energy field

Wang

et al. 2023

Materials Science and Technology

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“…The prepared AZ31B magnesium alloy samples were fastened onto the fixture by screws. The experimental apparatus was described in Zhou et al [14] in detail.…”

Section: Methodsmentioning

confidence: 99%

Study on laser surface melting of AZ31B magnesium alloy with different ultrasonic vibration amplitude

Zhou

Tan

et al. 2017

Corrosion Engineering, Science and Technology

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The laser surface melted layers were fabricated on AZ31B magnesium alloy by ultrasonic vibrationassisted using with different vibration amplitude. Microstructural evolution and corrosion resistance were studied systematically. The uniformity and compactness of the microstructure can be get further improved with the increase of vibration amplitude, while the coarse microstructure is observed at an even higher vibration amplitude. The melted layer with a reasonable vibration amplitude at the maximum outputs of 80% possess the highest microhardness, and the lowest corrosion current density as well as the minimal corrosion rate than the substrate. The results of electrochemical impedance spectra (EIS) and corrosion morphology are in agreement with potentiodynamic polarisation measurements, the charge transfer resistance (Rct) and corrosion area of the sample at 80% vibration amplitude are highest and smallest, respectively. Experimental results revealed that the melted layer fabricated at 80% of the maximum vibration amplitude output value exhibit the best anti-corrosion performance.

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“…The ultrasonic wave interacts with materials in the molten pool in the process of laser cladding to produce cavitation and thermal effects. The effects vary the subcooling degree of the local molten pool, thus refining grains [ 12 , 13 ] and uniforming the structure [ 14 , 15 , 16 ] to a certain extent. Therefore, ultrasonic vibration can effectively upgrade the internal microstructure of coatings by reducing internal defects such as cracks and pores and improving powder agglomeration [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties of NbC-Reinforced Ni-Based Coatings Synthesized In Situ by Ultrasonic Vibration-Assisted Laser Cladding

et al. 2023

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This paper aims to explore the mechanism of an ultrasonic applied field on the microstructures and properties of coatings, and clarify the evolution of the molten pool under different ultrasonic frequencies. The Taguchi experimental design method was adopted in this paper. NbC-reinforced Ni-based coatings were in situ synthesized by laser cladding to investigate the effects of ultrasonic vibration process parameters on the microstructure, pore area, microhardness, and wear resistance of the cladding layer. The results show that the pore area decreases first and then increases as ultrasonic power increases from 600 to 900 W and ultrasonic frequency from 23 to 40 kHz. On the contrary, the hardness and wear resistance increase at first and then decrease. The pore area is minimized at 800 W ultrasonic power and 32 kHz ultrasonic frequency, and the hardness is maximized at 600 W ultrasonic power and 40 kHz ultrasonic frequency. Meanwhile, the highest wear resistance can be obtained when ultrasonic power is 700 W and ultrasonic frequency is 32 kHz. Based on the phase structure analysis, the cladding layer mainly consists of FeNi3, NbC, B4C, and CrB2. Ultrasonic vibration will not change the phase composition of the layer. Combined with the varying G/R value and cooling rate, the reasons for the change in grain morphology in different areas were analyzed to reveal the evolution mechanism of the molten pool under the influence of ultrasound.

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Microstructure and mechanical properties of Cr12MoV by ultrasonic vibration-assisted laser surface melting

Cited by 14 publications

References 28 publications

Laser cladding Co-based coating coupled with electromagnetic/ultrasonic compound energy field

Laser cladding Co-based coating coupled with electromagnetic/ultrasonic compound energy field

Study on laser surface melting of AZ31B magnesium alloy with different ultrasonic vibration amplitude

Microstructures and Properties of NbC-Reinforced Ni-Based Coatings Synthesized In Situ by Ultrasonic Vibration-Assisted Laser Cladding

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