Effect of substrate dilution on corrosion of colmonoy-6 weld overlays in nitric acid

Chandran, Sinu; Vinayak, Seema; Subramanian, Veena; Rangarajan, S.; Velmurugan, S.; Narasimhan, S.V.; Ramasubbu, V.; Albert, Shaju K.

doi:10.1504/ijnest.2011.043395

Cited by 20 publications

(7 citation statements)

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“…Nickel-based hardfacing on different ASS produces microstructure comprising of γ -Ni phase with an interdendritic eutectic mixture of γ -Ni and Ni-rich borides [7,21,[23][24][25][26][27][28]. Hardfacing of Ni50 on 304L ASS with PTA welding gives an average hardness value of 660 HV in the coating region and an average wear rate of 0.000106 g min −1 at 30N load and 180 min test time with Ni-rich γ (Ni, Fe), Cr 7 C 3 , CrB, Cr 3 C 2 , M 23 C 6 , Ni 3 B, and Ni 3 Si phases in as deposited coating [3].…”

Section: Review Of Literaturementioning

confidence: 99%

“…and out of these, it is evident that weld current is mainly responsible for the variation in heat input. Previous researchers have also witnessed heat input as a major criteria for variation in microstructure and mechanical properties such as micro-hardness and wear resistance [2,3,21,[25][26][27]29,38]. Actual hardfacing is executed in synergetic mode, i.e.…”

Section: Preparation Of Weld Overlay Surfacementioning

confidence: 99%

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On the performance of weld overlay characteristics of Ni–Cr–Si–B deposition on 304 ASS using synergetic pulse-GMAW process

Zunake

Калыанкар

2020

Science and Technology of Welding and Joining

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Ni-Cr-Si-B alloy deposition on 304 ASS is executed by making use of automated processes like PTA, laser cladding, etc., which are supportive in the mass production. However, for repairment and job-specific works, such processes become more expensive and hence cost-effective pulse-GMAW process is proposed. The effect of current on the coating characteristics is investigated. Microstructure reveals a eutectic structure near interface, which changes to a hypereutectic near the top surface. γ -Ni, carbides and borides phases are observed in coating, which increases hardness (529.3 HV 1.0 ) and wear resistance (20 times). The present study reveals an inverse relation of hardness and wear resistance with current due to increased iron content in coating at higher current which suppresses boride formation.

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Section: Review Of Literaturementioning

confidence: 99%

Section: Preparation Of Weld Overlay Surfacementioning

confidence: 99%

On the performance of weld overlay characteristics of Ni–Cr–Si–B deposition on 304 ASS using synergetic pulse-GMAW process

Zunake

Калыанкар

2020

Science and Technology of Welding and Joining

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“…Also, higher carbon concentration results in improved resistance against corrosion [ 52 ]. After the cladding process, there is an increase in the area fraction of carbides, which in turn increases the carbon content [ 53 ]. Further, the increased carbon content can be due to the decomposition of metallic bonds in the alloy during high laser power radiation.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Microstructure, Nanohardness and Corrosion Response of Laser Cladded Colmonoy-6 Particles on 316L Steel Substrate

2021

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316L steel is predominantly used in manufacturing the components of high-pressure boilers, heat exchangers, aerospace engines, oil and gas refineries, etc. Its notable percentage of chromium offers resistance against corrosion and is mostly implemented in harsh environments. However, long-term exposure to these components in such environments can reduce their corrosion resistance property. Particularly at high temperatures, the oxide film formed on this type of steel reacts with the chloride, sulfides, sulfates, fluorides and forms intermetallic compounds which affect its resistance, followed by failures and losses. This work is focused on investigating the hardness, microstructure and corrosion resistance of the laser cladded Colmonoy-6 particles on the 316L steel substrate. The cladded specimens were dissected into cubic shapes and the microstructure present in the cladded region was effectively analyzed using the FESEM along with the corresponding EDS mapping. For evaluating the hardness of the cladded samples, the nanoindentation technique was performed using the TI980 TriboIndenter and the values were measured. The potentiodynamic polarization curves were plotted for both the substrate and clad samples at 0, 18, 42 and 70 h for revealing the corrosion resistance behavior. In addition, the EIS analysis was carried out to further confirm the resistance offered by the samples. The surface roughness morphology was evaluated after the corrosion process using the laser microscope, and the roughness values were measured and compared with the substrate samples. The result showed that the cladded samples experience greater hardness, lower values of surface roughness and provide better corrosion resistance when compared with substrate samples. This is due to the deposition of precipitates of chromium-rich carbide and borides that enhances the above properties and forms a stable passive film that resists corrosion during the corrosion process.

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“…Outra abordagem, com a mesma metodologia de Ramasubbu et al [2], porém com o objetivo de avaliar o efeito da diluição na resistência a corrosão aquosa foi realizada por Chandran e Vinayak [5]. Os resultados apresentados mostram que a resistência à corrosão é menor no 1° e 2° cordão.…”

Section: Introductionunclassified

“…Ramasubbu et al [2] e Chandran e Vinayak [5] levantaram essa hipótese quando compararam a dureza do revestimento (5° cordão com pouca diluição) com a dureza de uma amostra sem diluição, depositada sobre uma chapa de cobre. Ao contrário do esperado, a amostra depositada sobre o cobre, sem diluição e com maior taxa de resfriamento (cobre tem alta condutividade térmica) apresentou menor dureza.…”

Section: Introductionunclassified

Liga NiCrSiBC: Microestrutura e Dureza de Revestimentos Processados a Arco e a Laser

Silva

D'Oliveira

2015

Soldag. insp.

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualq'uer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Recebido: 21 Jan., 2015 Aceito: 13 Mar., 2015 E-mails: leandro.tools@gmail.com (LJS), sofmat@ufpr.br (ASCMDO)Resumo: A técnica de processamento é determinante sobre características de um revestimento. Isso porque o aporte térmico, que depende da técnica e dos parâmetros, tem influência sobre a diluição e a taxa de solidificação. Em ligas com baixa complexidade metalúrgica, o impacto do processamento com técnicas de deposição que impõem maior taxa de resfriamento podem se traduzir em refino da microestrutura. Espera-se que quanto mais refinada a microestrutura maior a resistência mecânica do revestimento. Entretanto, na deposição de ligas de maior complexidade metalúrgica isso nem sempre ocorre, porque a elevada taxa de resfriamento pode suprimir formação/precipitação de fases responsáveis pela resistência. Neste estudo, a influência do processamento sobre microestrutura e dureza de revestimentos da liga Colmonoy-6  foi avaliada. A liga foi processada por plasma com arco transferido (PTA) e laser de diodo de alta potência (HPDL) sobre chapas de AISI 304 com dois níveis de diluição. Em ambos os casos, revestimentos de boa qualidade e livres defeitos foram obtidos. O aumento do teor de Fe (diluição) e as diferentes taxas de resfriamento decorrem do processamento com diferentes parâmetros e técnicas. Em consequência, ocorrem mudanças significativas na microestrutura e na dureza dos revestimentos que estão associadas à distribuição, morfologia e composição química dos carbonetos e, principalmente, dos boretos. Palavras-chave:Revestimentos soldado; Processamento; PTA; Laser cladding. NiCrSiBC Coating: Microstructure and Hardness of Coatings Processed by Arc and LaserAbstract: The processing technique rules the characteristics of coatings. The heat input that depends on the technique and deposition parameters, accounts for changes on the dilution and solidification rate. Depositing alloys with low metallurgical complexity with a faster solidification rate can result on microstructure refining and therefore a higher mechanical resistance is expected. However, in the deposition of more complex alloys, a higher cooling rate can suppress the formation/precipitation of hard phases/compounds compromising the mechanical resistance of coatings. In this study, the influence of the processing technique on microstructure and hardness of Colmonoy-6  alloy coating was analyzed. Coatings were processed by plasma transferred arc (PTA) and high power diode laser (HPDL) on plates of AISI 304 with two different dilutions each. High quality and defect-free coating were processed. Iron content in coatings and their cooling rate were determined by the deposition technique. Consequently, significant changes in microstructure and hardness of coating occurred and were as...

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Effect of substrate dilution on corrosion of colmonoy-6 weld overlays in nitric acid

Cited by 20 publications

References 0 publications

On the performance of weld overlay characteristics of Ni–Cr–Si–B deposition on 304 ASS using synergetic pulse-GMAW process

On the performance of weld overlay characteristics of Ni–Cr–Si–B deposition on 304 ASS using synergetic pulse-GMAW process

Investigation on Microstructure, Nanohardness and Corrosion Response of Laser Cladded Colmonoy-6 Particles on 316L Steel Substrate

Liga NiCrSiBC: Microestrutura e Dureza de Revestimentos Processados a Arco e a Laser

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