Process and performance of ultra-high-speed laser cladding corrosion-resistant layer on the surface of tungsten cathode

Laser modification techniques have been widely adopted in the field of surface engineering. Among these modified techniques, ultra-high-speed laser cladding is trending most nowadays to fabricate wear-resistant surfaces. The main purpose of this research is to provide a detailed insight of ultra-high-speed laser cladding of hard Ni60 alloy on LA43M magnesium alloy to enhance its surface mechanical properties. Multiple processing parameters were investigated to obtain the optimal result. The synthesized coating was studied microstructurally by field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The microhardness and wear resistance of the Ni60 coating were analyzed under Vickers hardness and pin on disc tribometer respectively. The obtained results show that the dense Ni60 coating was fabricated with a thickness of 300 μm. No cracks and porosities were detected in cross-sectional morphology. The Ni60 coating was mainly composed of γ-Ni and hard phases (chromium carbides and borides). The average microhardness of coating was recorded as 948 HV0.3, which is approximately eight times higher than that of the substrate. Meanwhile, the Ni60 coating exhibited better wear resistance than the substrate, which was validated upon the wear loss and wear mechanism. The wear loss recorded for the substrate was 6.5 times higher than that of the coating. The main wear mechanism in the Ni60 coating was adhesive while the substrate showed abrasive characteristics.

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Laser Cladding of Wear- and Corrosion-Resistant Layer on Carbon Steel.

Journal of the Japan Society for Precision Engineering ◽

10.2493/jjspe.64.763 ◽

1998 ◽

Vol 64 (5) ◽

pp. 763-767

Author(s):

Hiromi Nagakura ◽

Kazuhiro Nakata ◽

Yosioki Honda ◽

Shogo Tomida

Keyword(s):

Carbon Steel ◽

Laser Cladding ◽

Corrosion Resistant ◽

Wear And Corrosion ◽

Resistant Layer

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Analysis on the Structure and Performance of Austenitic Stainless Steel Cladding Layer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.687-691.4214 ◽

2014 ◽

Vol 687-691 ◽

pp. 4214-4217

Author(s):

Xiao Ding ◽

Zhi Ling Wang

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Austenitic Stainless Steel ◽

Transition Layer ◽

Bending Test ◽

Micro Hardness ◽

Welding Wire ◽

Corrosion Resistant ◽

And Performance ◽

Resistant Layer

MIG welding overlaid austenitic stainless steel on low alloy Q345B. The overlay cladding comprises a transition layer and corrosion resistant layer. Overlaying specimens of transition layer with different thicknesses were prepared. The mechanical properties of joints were tested by micro-hardness, bending test and other methods. The results showed that the mechanical properties of specimen with ER309L welding wire as transition layer did not have splitting phenomena after being bended. There were no cracks. However, the specimen without transition layer had small crack or tiny cracks. When the transition layer thickness is changed, the performance of overlay cladding is essentially unchanged. The organizations of overlay cladding in four groups of specimens are similar, which are composed of austenite and ferrite, and ferrite was mostly distributed in strips and blocks.

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