A comparison of the cavitation erosion resistance of TiNi alloys, SUS304 stainless steel and Ni-based self-fluxing alloy

Wu, S.K.; Lin, Hong‐Ping; Yeh, Cheng-Hung

doi:10.1016/s0043-1648(00)00443-9

Cited by 87 publications

(34 citation statements)

References 26 publications

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“…Thus, it is inferred that the failure of the NiTi thin film is caused by accumulated plastic deformation of the substrate as a result of loading and unloading effects from cavitation and the associated stressing of the film that results in locailised fracture. cavitation bubbles preferentially nucleated and caused accelerated erosion [106]. EDS analysis from the bottom of the pits showed a concentration of 99% Fe, indicating that the TiNi film had been perforated and that the underlying mild steel substrate was being severely eroded.…”

Section: (D) For the (E) (F) (G)mentioning

confidence: 99%

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Yang

Tieu

Dunne

et al. 2009

Wear

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AcknowledgementsFirst and foremost, I would like to thank my principal supervisor, Professor A. Kiet.Tieu., for providing timely and insightful advice, financial and spiritual support. My supervisor's implicit trust in my research abilities not only allowed me to freely pursue my goals, but also gave me an opportunity to learn how to manage time and allocate resources. Special thanks go to Professor Druce Dunne, for his insightful instruction and for all the generous attention and time he devoted to my research work. Tables Table 5. List of List of Figures AbstractThe objective of this work was to produce near-equiatomic NiTi thin films by filtered arc deposition system (FADS) to improve the cavitation erosion resistance of a steel base working in liquid. First, deposition conditions were optimized in order to obtain near-equiatomic NiTi films. Energy dispersive spectroscopy (EDS) was used to measure the composition of films. It was found that both the substrate bias voltage and arc current affect the compositions of as-deposited NiTi films. X-ray diffractometry (XRD) and transmission electron microscopy (TEM) were used to investigate the microstructures of Ni-rich, Ti-rich and near-equiatomic films. Their thermal behaviours were tested using differential scanning calorimetry (DSC). Atomic force microscopy (AFM), ultra micro-indentation system (UMIS) and Romulus scratch testing were used to measure the roughness, hardness and adhesive force of a near-equiatomic thin film.The cavitation erosion resistance of the near-equiatomic NiTi film was assessed using ASTM Test Method G32. It was found that NiTi thin films showed significantly higher cavitation erosion resistance than 316 austenitic stainless steel. The improved cavitation erosion resistance was attributed to the recoverable deformation associated with pseudoelasticity of the NiTi thin film.The effect of substrate temperature on the properties of NiTi thin films was investigated by preheating substrates to different temperatures (130 C, 300 C, 430 C and 600 C). temperature of 600 C was more resistant to cavitation erosion than films deposited at other bias voltages with a similar substrate temperature.The effect of substrate material on the properties of NiTi thin films was investigated by comparing films on mild steel and on austenitic stainless steel. For similar deposition conditions, the NiTi film deposited on mild steel consisted of B2, B19' and R phases, while the NiTi film on stainless steel was dominated by B2 parent phase. This is probably because the lower thermal conductivity of austenitic stainless steel resulted in a higher deposition temperature.The dominance of the B2 phase for deposition with a high substrate temperature, a high bias voltage and the use of stainless steel substrate was not found to be due to Ni-enrichment of the films, but is consistent with stabilization of the parent phase by possible pick-up oxygen and nitrogen from the chamber atmosphere when the deposition temperature is high.The research program successfully pro...

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Section: (D) For the (E) (F) (G)mentioning

confidence: 99%

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Yang

Tieu

Dunne

et al. 2009

Wear

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“…Além destas ligas tem-se pesquisado a utilização de ligas como NiTi e ligas Fe-Mn-Cr-Si para a produção de peças e revestimentos resistentes à cavitação [4][5][6][7][8][9][10][11]. Estes materiais apresentam elevada tenacidade, que combinada com o elevado endurecimento por encruamento e formação de martensita sob solicitação mecânica, conferem a estes materiais uma elevada resistência à cavitação.…”

Section: Introductionunclassified

Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM

et al. 2012

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“…[15] A self-fluxing property was recently observed in Ni-based alloys containing Cr, B, Si, and C during welding, hardfacing, thermal spraying, and brazing. [16] Another problem is the poor fracture toughness. Because reinforcing particles generally act as fracture initiation sites, surface composites can be easily fractured under a low level of external stress.…”

Section: Introductionmentioning

confidence: 99%

“…Because Fe-based metamorphic powders contained a large amount of Cr, Ni, Mo, B, Si, and C, the self-fluxing effect was expected, and thus flux powders were not used. [16] The advantages of VC powders, which were very hard and thermally stable, were also achieved by forming vanadium carbides, in addition. The microstructure, hardness, and fracture toughness of the four surface composites were comparatively analyzed, to understand the mechanisms involved in surface property improvement, in particular, the fracture toughness improvement due to the addition of VC powders.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Microstructure, Hardness, and Fracture Toughness of Fe-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation with Fe-Based Metamorphic Alloy Powders and VC Powders

Nam

Lee

2009

Metall Mater Trans A

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Iron-based surface composites were fabricated with Fe-based metamorphic alloy powders and VC powders by high-energy electron beam irradiation, and the correlation of their microstructure with hardness and fracture toughness was investigated. Mixtures of metamorphic powders and VC powders were deposited on a plain carbon steel substrate, and then the electron beam was irradiated on these powders without flux, to fabricate surface composites. The composite layers 1.3 to 1.8 mm in thickness contained a large amount (up to 47 vol pct) of hard Cr 2 B and V 8 C 7 particles formed in eutectic colony regions and inside colonies, respectively. The hardness of the surface composites was approximately 2 to 4 times greater than that of the substrate because of Cr 2 B and V 8 C 7 particles. According to the microfracture observation of the composite fabricated with mixing 30 wt pct VC powders, microcracks initiated at coarse V 8 C 7 particles ins inside colonies as well as at Cr 2 B particles in colony regions, and were connected with other microcracks in a zigzag shape. Thus, it showed a higher fracture toughness and hardness twice as high as the composite fabricated without mixing VC powders.

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A comparison of the cavitation erosion resistance of TiNi alloys, SUS304 stainless steel and Ni-based self-fluxing alloy

Cited by 87 publications

References 26 publications

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Cavitation erosion resistance of NiTi thin films produced by Filtered Arc Deposition

Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM

Correlation of Microstructure, Hardness, and Fracture Toughness of Fe-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation with Fe-Based Metamorphic Alloy Powders and VC Powders

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