Microstructure, microhardness and corrosion resistance of Stellite-6 coatings reinforced with WC particles using laser cladding

Bartkowski, Dariusz; Młynarczak, A.; Piasecki, Adam; Dudziak, B.; Gościański, M.; Bartkowska, Aneta

doi:10.1016/j.optlastec.2014.12.005

Cited by 181 publications

(69 citation statements)

References 19 publications

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“…Increasing of wear and corrosion resistance, as well as reduction the brittleness of boronized layers can be obtained by modification of these layers using chromium [1,6,7], nickel [8][9][10], and copper [6]. To achieve this purpose, the diffusion methods [1,6,8]; laser methods (e.g., laser hardening [11][12][13], laser remelting [4,7,14], laser alloying [15][16][17], laser cladding [18][19][20][21]); as well as the electroplating [8][9][10] or thermal spraying methods [22] can be applied. Laser remelting of boronized layers allows changes in their microstructure and properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, chemical composition, wear, and corrosion resistance of FeB–Fe2B–Fe3B surface layers produced on Vanadis-6 steel using CO2 laser

Bartkowska

Bartkowski

Swadźba

et al. 2017

Int J Adv Manuf Technol

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The paper presents the study results of laser modification of FeB-Fe 2 B surface layers produced on Vanadis-6 steel using pack cementation method. Microstructure, x-ray phase analysis, chemical composition study using wave dispersive spectrometry method, microhardness, corrosion resistance as well as surface condition, roughness, and wear resistance were investigated. The diffusion boronizing processes were performed at 900°C for 5 h in the EKabor® powder mixture. The boronized layers had a dual-phase microstructure composed of two types of iron borides, FeB and Fe 2 B, and their microhardness ranged from 1800 to 1400 HV. The laser surface modification was carried out on specimens after diffusion boronizing process using CO 2 laser with a nominal power of 2600 W. Laser beam power used in this experiment was equal to 1040 W and was constant. While the three values of scanning speed were used: 19, 48, and 75 mm/s. During laser modification, the multiple tracks were made where distance between of axis tracks was equal to 0.5 mm. As a result of this process, microstructure consisted of remelted zone, heat-affected zone, and substrate was obtained. In remelted zone, the boron-martensite eutectic was observed. Boronized layers after laser modification were characterized by the mild gradient of microhardness from surface to the substrate and their value was dependent on the scanning speed used and was between 1700 and 1100 HV. Corrosion resistance tests revealed reducing the current of corrosion in case of laser modification process. Wear resistance of laser modified specimens was improved in comparison to diffusion boronized layers.

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Section: Introductionmentioning

confidence: 99%

Microstructure, chemical composition, wear, and corrosion resistance of FeB–Fe2B–Fe3B surface layers produced on Vanadis-6 steel using CO2 laser

Bartkowska

Bartkowski

Swadźba

et al. 2017

Int J Adv Manuf Technol

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“…According to Li's research, the microstructure of laser additive manufacturing consisted of γ', MC and γ [25]. According to the research of microstructure of Stellite-6 [26][27][28], the Stellite-6 deposition microstructure might consist of γ (Co) and carbide formations (M 23 C 6 , M 6 C, M 7 C 3 ). Figure 6a illustrates the microstructures of K465 by LMDS, and white precipitates appear discontinuously in the interdendritic, which was an MC phase.…”

Section: Phase Compositionsmentioning

confidence: 99%

Microstructure and Microhardness of Laser Metal Deposition Shaping K465/Stellite-6 Laminated Material

Wang

Zhao

et al. 2017

Metals

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K465 superalloy with high titanium and aluminum contents was easy to crack during laser metal deposition. In this study, the crack-free sample of K465/Stellite-6 laminated material was formed by laser metal deposition shaping to control the cracking behaviour in laser metal deposition of K465 superalloy. The microstructure differences between the K465 superalloy with cracking and the laminated material were discussed. The microstructure and intermetallic phases were analyzed through scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that the microstructure of K465/Stellite-6 laminated material samples consisted of continuous dendrites with a similar structure size in different alloy deposition layers, and the second dendrite arm spacing was finer compared with laser metal deposition shaping K465. The intermetallic phases in the different alloy deposition layers varied, and the volume fraction of carbides in K465 deposition layer of the laminated material was higher than only K465 deposition under the fluid flow effect. In addition, the composition and microhardness distribution of laminated materials variation occurred along the deposition direction.Keywords: laser metal deposition shaping; laminated material; microstructure; microhardness BackgroundK465 superalloy, known as a nickel-based alloy, is widely used for gas turbine blades and vanes [1]. K465 superalloy parts are mainly formed by conventional casting, leading to some disadvantages in forming efficiency and mechanical properties. Laser metal deposition shaping (LMDS) is an efficient way for producing components with near-net-shaped, directional solidification, and controlled porosity or chemical composition gradient [2,3], and it also knows direct laser fabrication (DLF), or laser solid form (LSF [12], and CM247LC [13] were prone to cracking. The crack sensitivity of nickel-based superalloy increases with the increasing of aluminum and titanium elements. As a result, the research focus of LMDS K465 superalloy concentrates on controlling the cracks. Based on previous studies, the crack category of laser deposition superalloy may contain solidification cracking, grain boundary liquation cracking and ductility dip cracking [10]. Among them, the liquation cracks are the most serious in nickel-based superalloy with a high content of (Al + Ti), and may originate from the liquation of low melting point eutectic in the previous build layers. Chen et al. [6] have found that liquation cracking in laser deposited 718 alloy was on account of

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“…wetting carbide, part of the due to the difference in temperature between the alloy and carbide formation stratification cause melting groove in cladding process. Cobalt based commercial Stellate alloy [4] is actually a kind of self fluxing alloy with better self fluxing, preparation process the same as self fluxing alloy by atomization process, and different form coated composite alloy powder by chemical plating process. Figure.4 shows self fluxing alloy mixed carbide tungsten cladding coating surface, same as single self fluxing alloy coating.…”

Section: Morphology Analysismentioning

confidence: 99%

Study on Cladding Performance, Coating Microstructure and Interfacial Bonding of Metal-base Coatings by Non-contact Cladding

Ma¹,

Shao²,

Zhang³

et al. 2017

dtmse

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Coating material and its cladding performance is the key to the preparation of high quality coating. In this paper, cladding performance, cladding coating morphology, interface diffusion and microstructure of typical alloy powder material were studied, such as self-melting alloy powder, coated composite powder and mixture metal ceramic powder by experiment. The results show that self-melting alloy prepared by atomization technology has well cladding performance which coating with compact microstructure. Composite alloy powder prepared by chemical method technology has poor cladding performance which loose microstructure. Mixed metal ceramic powder has well cladding performance which homogeneous microstructure. Fe-base alloy and Co-base alloy can be achieved diffusion metallurgical combination with the steel substrate.

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Microstructure, microhardness and corrosion resistance of Stellite-6 coatings reinforced with WC particles using laser cladding

Cited by 181 publications

References 19 publications

Microstructure, chemical composition, wear, and corrosion resistance of FeB–Fe2B–Fe3B surface layers produced on Vanadis-6 steel using CO2 laser

Microstructure, chemical composition, wear, and corrosion resistance of FeB–Fe2B–Fe3B surface layers produced on Vanadis-6 steel using CO2 laser

Microstructure and Microhardness of Laser Metal Deposition Shaping K465/Stellite-6 Laminated Material

Study on Cladding Performance, Coating Microstructure and Interfacial Bonding of Metal-base Coatings by Non-contact Cladding

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