Microstructure and oxidation resistance of cryomilled NiCrAlY coating by laser induction hybrid rapid cladding

Zhou, Shengfeng; Xiong, Zheng; Dai, Xiaoqin; Liu, Jia; Zhang, Tianyou; Wang, Chunxia

doi:10.1016/j.surfcoat.2014.07.052

Cited by 20 publications

(14 citation statements)

References 35 publications

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“…As a result, the solidification process starts from plane grains and gradually changes to columnar grains or coarse dendrites. The coarse dendrites become fine dendrites and equiaxed grains with the solidification frontline moving upwards [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding

Feng

2021

Materials

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This paper investigated 55 NiTi commercial alloy powder and 55 NiTi with 5% pure Ni mixed powder (55 NiTi + 5 Ni) coatings fabricated by laser cladding to study the effect of extra Ni addition on the microstructure and properties of the coating. The XRD and EDS results show that the major phases in the coatings were NiTi and Ni3Ti. Besides that, a second phase like Ni4Ti3, Fe2Ti, and NiTi2 was also detected, among which, NiTi2 was only found in 55 NiTi coating. The proportion of the phase composition in the coating was calculated via the software Image-Pro Plus. The hardness of the cladding layer reaches 770–830 HV, which was almost four times harder than the substrate, and the hardness of 55 NiTi + 5 Ni coating was around 8% higher than that of 55 NiTi coating. The wear resistance of the 55 NiTi + 5 Ni coating was also better; the wear mass loss decreased by about 13% and with a smaller friction coefficient compared with the 55 NiTi coating. These results are attributed to the solid solution strengthening effect caused by Ni addition and the second phase strengthening effect caused by the content increase of the Ni3Ti phase in the cladding layer.

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Section: Resultsmentioning

confidence: 99%

Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding

Feng

2021

Materials

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“…Some cracks, marked with white arrows in Figures 4 and 5, along the direction perpendicular to the laser scanning path were found on the surface of 55NiTi coating. The formation of these cracks was observed during the cooling stage after the cladding process, which is attributed to the release of the thermal stress caused by the rapid cooling [26]. However, no cracks were found on 55NiTi + 5Ni coating, the surface of which was plain and smooth.…”

Section: Macroscopic Morphology Of the Coatingmentioning

confidence: 99%

“…Coatings 2021, 11, x FOR PEER REVIEW 7 of 18 results are in line with the microstructure observed in Figure 7. With the increase of the undercooling degree, the critical nucleation radius decreased while the nucleation ratio increased, which resulted in the finer grain size in the cladding layer during the solidification process [26]. As is well known, small grains are beneficial to improve the mechanical properties of materials according to the fine-grain strengthening effect.…”

Section: Phase Composition and Microstructure Of The Coatingmentioning

confidence: 99%

“…Fe and Cr atoms, which diffused from the substrate, were on the one hand trapped in the NiTi phase and existed in the form of a solid solution due to the high cooling rate of the laser cladding process; on the other hand, Fe and Cr atoms have results are in line with the microstructure observed in Figure 7. With the increase of the undercooling degree, the critical nucleation radius decreased while the nucleation ratio increased, which resulted in the finer grain size in the cladding layer during the solidification process [26]. As is well known, small grains are beneficial to improve the mechanical properties of materials according to the fine-grain strengthening effect.…”

Section: Phase Composition and Microstructure Of The Coatingmentioning

confidence: 99%

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Effect of Ni Addition on the Corrosion Resistance of NiTi Alloy Coatings on AISI 316L Substrate Prepared by Laser Cladding

Feng

2021

Coatings

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In this paper, an equiatomic NiTi (55NiTi) alloy powder was mixed with pure Ni powder to prepare laser cladding coatings on a 316L stainless steel substrate to study the effect of Ni addition on the microstructure and corrosion resistance of the coatings. The microstructure and phase composition of the coatings were analyzed using a scanning electron microscope (SEM) with configured energy-dispersive spectrometer (EDS) and X-ray diffractometer (XRD). OCP (open-circuit potential), PD (potentiodynamic polarization) and EIS (electrochemical impedance spectroscopy) experiments were conducted by a Gamry electrochemical workstation, and corresponding eroded morphologies were observed to evaluate the coating’s anti-corrosion performance. The addition of Ni led to fine and uniform dendrites and dense microstructure under the metallurgical microscope, which were beneficial for the formation of the passive film mainly consisting of titanium dioxide (TiO2). The results show that the pitting potential of the 55NiTi + 5Ni coating was 0.11 V nobler than that of the 55NiTi coating, and the corrosion current density was less than half that of the 55NiTi coating. The corrosion initiated preferentially at the interfaces of dendrites and inter-dendritic areas, then spread first to dendrites rather than in the inter-dendritic areas.

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“…Pereira et al prepared two kinds of MCrAlY (M–Ni, Co) coatings on austenitic steel by laser cladding, and proved that NiCoCrAlY has better high temperature oxidation resistance than CoNiCrAlY. Zhou et al applied laser‐induced cladding to prepare coating by ball milled NiCrAlY powder, and concluded that the ball milling time has effects on the microstructure growth and can improve the oxidation resistance of the coating. It is noted that present studies do not involve any research related to different ratios of NiCrAlY/Ni‐based metal composites.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inconel718–NiCrAlY Composites Prepared by Laser Engineered Net Shaping

et al. 2018

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Near-defect-free block Inconel718-NiCrAlY composites prepared by laser engineered net shaping are investigated in this study. XRD, SEM, and EDS are applied to analyze the phase composition and microstructure characteristics. The mechanical properties are evaluated by microhardness tester and friction-wear tester. The results show that NiAl brittle intermetallic compounds precipitate in the matrix when NiCrAlY content reaches 60% or more. With the increase of NiCrAlY ratio, the distribution of NiAl changes from intergranular precipitation to intragranular precipitation, and the dendrites growth directions become chaotic. The microhardness of composites improves as the NiCrAlY content rises, reaching to 419 HV for 100% NiCrAlY, and solid solution strengthening has better strengthening effect on microhardness than precipitation strengthening. The wear loss has a clear decrease only when 80% or more NiCrAlY is added, with the maximum wear loss drop of 15.66% for 100%NiCrAlY. The wear mechanisms change from the coexistence of adhesive wear and abrasive wear to mainly abrasive wear with micro brittle fractures when NiCrAlY content is high.

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Microstructure and oxidation resistance of cryomilled NiCrAlY coating by laser induction hybrid rapid cladding

Cited by 20 publications

References 35 publications

Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding

Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding

Effect of Ni Addition on the Corrosion Resistance of NiTi Alloy Coatings on AISI 316L Substrate Prepared by Laser Cladding

Microstructure and Mechanical Properties of Inconel718–NiCrAlY Composites Prepared by Laser Engineered Net Shaping

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