Phase composition and formation mechanisms of a high-velocity electric arc-sprayed FeNiCrAl coating

AlSi10Mg alloy has been widely used in selective laser melting (SLM). However, the formation of metallurgical defects in this material during SLM process has not been studied sufficiently. In this work, different laser parameters were adopted to fabricate the specimens. The effects of volumetric energy density (VED) on the metallurgical defect, densification, phase composition and mechanical property were also comprehensively analyzed. At low VED of 37.39[Formula: see text]J/mm3, a nearly full dense sample with density of 2.602[Formula: see text]g/cm3 can be printed. The sample with maximal tensile strength of 475[Formula: see text]MPa can be printed. While with the increase of VED, the ultimate tensile strength decreases due to the formation of micro-pores. The formation mechanisms of micro-pores including gas pores and keyhole-induced pores were disclosed from the angle of alloy smelting. Better understanding of the influence mechanisms of the laser parameters on the formation of metallurgical defects is beneficial for the production of high performance SLM parts.

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High velocity electric arc sprayed Fe-Al-Nb-B composite coating and its wear behavior

Acta Metallurgica Sinica (English Letters) ◽

10.1007/s40195-013-0017-z ◽

2013 ◽

Vol 26 (3) ◽

pp. 313-320 ◽

Cited By ~ 2

Author(s):

Yongxiong Chen ◽

Xiubing Liang ◽

Jinyuan Bai ◽

Binshi Xu

Keyword(s):

Composite Coating ◽

High Velocity ◽

Wear Behavior ◽

Electric Arc

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INFLUENCE OF ENERGY ON PHASE COMPOSITION OF END-PRODUCT OBTAINED BY VACUUM-FREE ELECTRIC ARC SYNTHESIS OF CUBIC SILICON CARBIDE

RUDN Journal of Engineering Researches ◽

10.22363/2312-8143-2018-19-2-165-176 ◽

2018 ◽

Vol 19 (2) ◽

pp. 165-176

Author(s):

A.Y. Pak ◽

◽

G.Y. Mamontov ◽

O.A. Bolotnikova ◽

◽

...

Keyword(s):

Silicon Carbide ◽

Phase Composition ◽

Electric Arc ◽

Cubic Silicon Carbide

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The effect of gas atmosphere on the coating formation by electric arc surfacing with cermet SHS electrodes of the TiB2–Co2B composition

Image Journal of Advanced Materials and Technologies ◽

10.17277/jamt.2021.03.pp.216-224 ◽

2021 ◽

Vol 6 (3) ◽

pp. 216-224

Author(s):

Alexandra O. Zhidovich ◽

Alexander M. Stolin ◽

Andrey P. Chizhikov ◽

Pavel M. Bazhin ◽

Alexander S. Konstantinov

Keyword(s):

Phase Composition ◽

Metal Matrix ◽

Protective Coatings ◽

Steel Substrate ◽

Nitrogen Atmosphere ◽

Electric Arc ◽

Argon Atmosphere ◽

Shs Extrusion ◽

Wide Range ◽

Gas Atmosphere

Due to their unique properties, metal-matrix composite materials, when used as a surfacing material for electric arc surfacing, provide high properties of the deposited layers. SHS-extrusion is a promising method for a wide range of surfacing metal-matrix electrodes. The gas environment of surfacing affects the quality of coatings formed by SHS electrodes, their microstructure and properties. In this paper, cermet SHS electrodes of the TiB2–Co2B composition obtained by SHS-extrusion were used to form protective coatings on a steel substrate by electric arc surfacing in an argon atmosphere and in a nitrogen atmosphere. The elemental and phase composition, as well as the microstructure of the deposited layers, were investigated. Based on the conducted studies, the influence of the gas atmosphere on the formation of the structure of cermet coatings was established. It is shown that, despite the similar phase composition, there are fundamental differences in the microstructures of the deposited coatings, which are caused by the partial fusion of the tungsten electrode and the transfer of the electrode material in the coating during surfacing in an argon atmosphere. The maximum values of the microhardness of coatings deposited in a nitrogen atmosphere exceed the maximum microhardness of coatings obtained by surfacing in an argon atmosphere by 200–450 HV.

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Study of Properties of Nanostructured and Conventional WC-12Co Coatings Deposited by HVO/AF

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.709.166 ◽

2013 ◽

Vol 709 ◽

pp. 166-171

Author(s):

Bai Lin Zha ◽

Su Lei Qiao ◽

Ding Yuan Huang ◽

Wei He ◽

Zhi Hong Zha ◽

...

Keyword(s):

Phase Composition ◽

Elastic Modulus ◽

Adhesive Strength ◽

High Velocity ◽

Fuel Spray ◽

High Microhardness

The three kinds of WC-12Co coatings were sprayed by High Velocity Oxygen/Air Fuel Spray (HVO/AF) in three different spray conditions, HVOF、HVO-AF and HVAF. The high velocity flame flow was produced by HVO/AF with the burning of kerosene and propellant which was mixed by oxygen and air at different ratio, it can be controlled from 1400°C to 2800°C.The microstructure was investigated by SEM, the phase composition was tested by XRD, and the microhardness and elastic modulus of coatings were investigated. The results indicate that the coatings with better adhesive strength and little porosity than conventional ones are dense and have a large value of elasticity and a high microhardness which is 0.4 times harder than the conventional coatings. The coatings are mainly composed of WC and Co, and there are also traces of W2C and Co6W6C. As temperature decreased, the decomposition of WC is being reduced.

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