Dilution effects in laser cladding of Ni–Cr–B–Si–C hardfacing alloys

Hemmati, I.; Ocelík, Václav; Hosson, J.Th.M. De

doi:10.1016/j.matlet.2012.06.054

Cited by 157 publications

(90 citation statements)

References 3 publications

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“…31 The clads were made with a scanning speed of 5 mm/s on a stainless steel bar substrate with a 50 mm diameter. In all cases, a 50% laser track overlap was used to create continuous coatings, and up to three layers of the coatings were built to eliminate compositional change by dilution 32,33 from the substrate. Equimolar mixtures of elemental powders with purity higher than 99.9% were fed using argon as a carrier gas into the melt pool created by a defocused laser beam (diameter of Gaussian beam of about 2.3 mm).…”

Section: Laser-deposited Alcocrfeni and Alcrfenita Heasmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

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129

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This contribution concentrates on the possibilities of additive manufacturing of high-entropy clad layers by laser processing. In particular, the effects of the laser surface processing parameters on the microstructure and hardness of high-entropy alloys (HEAs) were examined. AlCoCrFeNi alloys with different amounts of aluminum prepared by arc melting were investigated and compared with the laser beam remelted HEAs with the same composition. Attempts to form HEAs coatings with a direct laser deposition from the mixture of elemental powders were made for AlCoCrFeNi and AlCrFeNiTa composition. A strong influence of solidification rate on the amounts of face-centered cubic and bodycentered cubic phase, their chemical composition, and spatial distribution was detected for two-phase AlCoCrFeNi HEAs. It is concluded that a high-power laser is a versatile tool to synthesize interesting HEAs with additive manufacturing processing. Critical issues are related to the rate of (re)solidification, the dilution with the substrate, powder efficiency during cladding, and differences in melting points of clad powders making additive manufacturing processing from a simple mixture of elemental powders a challenging approach.

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Section: Laser-deposited Alcocrfeni and Alcrfenita Heasmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

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129

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“…Isso sugere que uma distribuição refinada e os boretos em forma de bloco também podem ter uma contribuição efetivos no endurecimento, ou seja, dificultam mais a movimentação das discordâncias. Durezas semelhantes, para revestimentos processados com laser cladding foram encontrados por Hemmati [3] (750 HV para diluição de 5% e 680 HV para diluição de 15%). Durezas entre 430 e 480 HV para revestimentos depositados por PTA (1 cordão) foram reportadas por Gurumoorthy et al [8] e Kesavan e Kamaraj [11,12] porém, esses autores não consideraram a diluição.…”

Section: Silva Et Alunclassified

“…Essa liga foi originalmente desenvolvida para deposição por aspersão térmica, mas devido as suas excelentes características e menor custo, em relação às superligas de Co, vem sendo depositada por vários processos de soldagem, como PTA [1], TIG [2] e Laser Cladding [3].…”

Section: Introductionunclassified

“…Hemmati et al [3] depositaram a liga Colmonoy-6  com a técnica laser cladding sobre chapas de aço baixo carbono e observaram alterações significativas na microestrutura e redução da dureza dos revestimentos com o aumento da diluição. Os autores atribuem essas alterações ao aumento do teor de Fe e explicam que o Fe modifica e suprime a formação dos boretos do eutético NiSiB, durante a solidificação.…”

Section: Introductionunclassified

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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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“…Не менее привлекательным способом восста-новления старых или повышения прочности новых деталей машин и механизмов является лазерная наплавка [13]. Ее технология характеризуется ми-нимальным тепловым вложением в наплавляемую деталь, что позволяет сохранить без изменений структуру сердцевины детали и получить высоко-дисперсную структуру наплавленного металла [14].…”

Section: Izvestiya Vuzov Poroshkovaya Metallurgiya I Funktsional'nyeunclassified

Hardening and welding with a fiber laser as the methods of purposeful formation of the structure and properties of VT6 titanium alloy

Горунов¹,

Gil'mutdinov²

2015

Izv. VUZ. Poroshk. Met.

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40Модифицирование поверхности, в том числе пучками заряженных частиц, потоками фотонов и плазмы Известия вузов. Порошковая металлургия и функциональные покрытия 4 2015 Введение В изделиях современного авиа-и машиностро-ения широкое применение находят титановые α + β-сплавы благодаря высоким прочностным и антикоррозионным свойствам, а также хорошей свариваемости. Они используются в крупнога-баритных сварных конструкциях летательных аппаратов [1]. Однако из-за высокой склонности к схватыванию и задиранию при работе на тре-ние скольжения их применение для изготовления УДК 621.9.048.7 DOI dx.doi. org/10.17073/1997-308X-2015-4-40-44 Упрочнение и наплавка волоконным лазером как способы целенаправленного формирования структуры и свойств титанового сплава ВТ6 © 2015 г. А.И. Горунов, А.Х. Гильмутдинов Казанский национальный исследовательский технический университет (КНИТУ) им. А.Н. Туполева Статья поступила в редакцию 13.11.14 г., доработана 24.04.15 г., подписана в печать 28.04.15 г.Приведены результаты изучения микроструктуры и твердости поверхностных слоев наплавленного с использованием воло-конного лазера никелевого сплава на титановый α + β-сплав после их комбинированного упрочнения при воздействии ла-зерного излучения. Лазерная наплавка позволяет получать покрытия с высокой твердостью и закалочными структурами в поверхностных слоях титанового сплава. Твердость наплавленного металла после высокоскоростного охлаждения с темпе-ратуры расплава на поверхности титановой подложки в 2,7 раза больше твердости мартенситного слоя, сформированного в титановом сплаве после закалки.Ключевые слова: лазерная наплавка, лазерное упрочнение, титановый сплав, микроструктура, микротвердость. The results of studying microstructure and hardness of surface layers of nickel alloy welded on titanium α + β alloy using fiber laser after their combined hardening under the effect of laser radiation are presented. Laser cladding makes it possible to form coatings with high hardness and quenching structures in surface layers of titanium alloy. Hardness of welded metal after the high-speed cooling from the melt temperature on the titanium substrate surface is larger than the density of martensite alloy formed in the titanium alloy after quenching.Keywords: laser cladding, laser hardening, titanium alloy, microstructure, microhardness.

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Dilution effects in laser cladding of Ni–Cr–B–Si–C hardfacing alloys

Cited by 157 publications

References 3 publications

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Additive Manufacturing of High-Entropy Alloys by Laser Processing

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

Hardening and welding with a fiber laser as the methods of purposeful formation of the structure and properties of VT6 titanium alloy

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