Wear performance of the Fe-based alloy coatings produced by plasma transferred arc weld-surfacing process

Yoon, Byoung-Hyun; Lee, Changhee

doi:10.1016/s0043-1648(01)00683-4

Cited by 72 publications

(29 citation statements)

References 7 publications

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“…The coatings of Fe-Cr-B metamorphic alloys have been fabricated by detonation gun thermal spray [2,4,5], high velocity oxygen fuel (HVOF) thermal spray [3,6,7], plasma transferred arc (PTA) weld-surfacing [6,8] and high-energy electron beam irradiation (HEEBI) [7] processes. For all of these fabrication processes, microstructure analysis showed that the coating consisted of boride particles such as Cr 1.65 Fe 0.35 B 0.96 and/or Cr 2 B dispersed in Fe-Cr solid solution matrix [2][3][4][5][6][7][8]. Although the existing phases are usually crystalline, HVOF spray produces a trace amount of amorphous phase and oxides [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

et al. 2011

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The spark plasma sintering (SPS) process was used to fabricate a bulk Fe-Cr-B alloy (known as Armacor M) from gas-atomized powders. The purpose of this work is to study the microstructure, hardness and tribology of this sintered bulk alloy. Post microstructure and mechanical characterizations were performed to investigate the effects of wear on the microstructure and mechanical properties. Microstructural analysis using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that SPS successfully produced a fully dense bulk material containing 67 vol.% Cr 1.65 Fe 0.35 B 0.96 particles dispersed in 33 vol.% solid solution matrix consisting of Fe, Cr and Si. Using nanoindentation, the hardness of the Cr 1.65 Fe 0.35 B 0.96 particles and the matrix was found to be 24 and 6 GPa, respectively. From microindentation, the bulk hardness of the sintered alloy was 9.7 GPa (991 HV). Dry sliding wear testing under mild conditions (i.e., initial Hertzian mean contact pressure of 280 MPa) was conducted against a stainless steel pin. The steady state coefficient of friction against Armacor M was about 0.82. The wear of Armacor M proceeded primarily by adhesive and mild oxidative wear. The wear volume for Armacor M was 80% less than that of carbon steel and its wear rate was 5.53 9 10 -6 mm 3 N -1 m -1 .

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Section: Introductionmentioning

confidence: 99%

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

et al. 2011

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“…As variações microestruturais ocorridas durante a solidificação de revestimentos soldados, tanto as decorrentes da alteração da composição química (mudança de fase e quantidade de região interdendritica) como as da taxa de solidificação (refino da microestrutura), são refletidas em variações na microdureza do revestimento em maior ou menor intensidade dependendo da magnitude das alterações. Apesar da extrapolação destes valores para prever a resistência ao desgaste ser limitada, a dureza tem sido amplamente utilizado na avaliação de revestimentos por PTA [14,[19][20][21][22][23].…”

Section: Resultsunclassified

Influência da corrente e granulometria do material de adição nos revestimentos processados por PTA

Bond¹,

Becker

D'Oliveira

2011

Soldag. insp.

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Resumo Revestimentos soldados são aplicados com o intuito de prolongar a vida útil IntroduçãoA campanha operacional de equipamentos que operam em ambientes agressivos pode ser ampliada se estes forem protegidos por revestimentos. Para isto existem várias técnicas de proteção superficial de componentes tais como: pintura, galvanização, metalização por aspersão térmica, cladização (chapas revestidas), eletrodeposição (Cu, Ni), por difusão (cementação e deposição em fase gasosa), redução química (niquelação), soldagem (hardfacing) [1,2].O termo hardfacing refere-se à deposição de um revestimento soldado de composição química distinta daquela do metal de base (componente) com o objetivo de alcançar na superfície propriedades específicas e que o substrato não possui. Existe uma grande variedade de materiais que podem ser aplicados como revestimentos, entre os mais importantes destacam-se as superligas a base de níquel e a base de cobalto. Os substratos mais comumente utilizados são os aços de baixo carbono ou médio carbono e os aços inoxidáveis, [2,3]. As superligas a base de níquel são conhecidas pela excelente resistência à corrosão em elevadas temperaturas. Já aquelas a base de cobalto destacam-se pela elevada resistência ao desgaste, sendo a mais e empregada a superliga denominada Stellite 6. Este material possui excelente resistência às várias formas de degradação química e mecânica sob temperaturas, mantém a dureza até 800°C, e tem baixa tendência ao aparecimento de trincas [4]. No entanto, as propriedades dos revestimentos de ligas de cobalto dependem do processo de deposição e para cada tipo de processo, dos parâmetros de processamento utilizados. Para a deposição são utilizados os processos de soldagem oxigás, a arco e laser, os quais são aplicados, preferencialmente, para obter espessuras maiores quando comparados aos processos de aspersão térmica, nos quais ocorre um ancoramento mecânico entre material de base e o revestimento [2]. Segundo Wu et al [3]

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“…Such coatings must have an increased thickness, good durability of adhesion with a basis, sufficient hardness and wear-resistance. In world practice the reduction of worn-out large-sized parts is carried out by retailoring [12,13,14], sputtering [15,16,17], cladding [18,19,20] and so on. But all these methods suppose an intensive thermal impact upon a part under reduction that results in hard-removable buckling and shrinkage.…”

Section: Problem Definitionmentioning

confidence: 99%

Peculiarities of heavy electro-mechanical plating on medium carbon steel 30 and 38 ChN3MA

2017

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Abstract.One of the urgent problems in mechanical engineering is development of efficient inexpensive thick-layered coatings for repair worn-out large-sized parts. To solve these problems a comparatively new method of electro-plating with simultaneous mechanical impact of a tool upon coating under formation is promising enough. In this paper there are considered the peculiarities of plating through this method of thick-layer electro-mechanical iron plating on medium carbon steel 30 and 38 ChN3MA, and the composition, structure and properties of coatings obtained are analyzed. Coatings were applied upon crank main journals made of steel 38ChN3MA and upon models imitating crank main journals made of steel 30. Micro-hardness of the coating obtained, roughness, a chemical composition and a structure were analyzed. The results of the investigations have shown that a more significant role in hardness increase is played not by a chemical composition of medium carbon steel upon which it is applied, but a preparation of the surface and the technology of coating and also an electrolyte composition. The structure of electro-mechanical plating is less defective, contains a value of detrimental impurities considerably lower of allowable values and has a satisfactory adhesion strength with a substrate. Problem definitionAt present one of the urgent problems in mechanical engineering is development of efficient and inexpensive heavy coatings for repair of worn large-sized parts [9,10,11]. Such coatings must have an increased thickness, good durability of adhesion with a basis, sufficient hardness and wear-resistance. In world practice the reduction of worn-out large-sized parts is carried out by retailoring [12,13,14], sputtering [15,16,17], cladding [18,19,20] and so on. But all these methods suppose an intensive thermal impact upon a part under reduction that results in hard-removable buckling and shrinkage.Therefore, more and more attention is paid to the process of galvano-mechanical metal deposition without temperature increase -flow-contact deposition of galvanoplatings with the mechanical activation of a cathode surface [5,6,7,8]. It is well-known that the mechanical effect upon a part in the course of galvanic deposition allows increasing the allowable current density, a deposition rate, micro-hardness, coating thickness and also improving the adhesion with a basis and decreasing residual stresses. Investigation procedure and equipmentThe considered in this paper off-bath method of the restoration through an electro-galvanic dry topping in a flowing electrolyte with the mechanical effect by a smoothing tool in the course of deposition is realized at small temperatures (40 -50 0 С). It prevents buckling and shrinkage in parts and ensures the required thickness (1.5 -1.8 mm), micro-hardness (600 -650 HV) and low roughness (Rа 1.25 -2.5 µm) stipulating for a small allowance for the further grinding of a layer restored. The method has small material and power expenses and a quick recoupment at the espense of the applicatio...

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Wear performance of the Fe-based alloy coatings produced by plasma transferred arc weld-surfacing process

Cited by 72 publications

References 7 publications

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

Microstructure and Tribology of Spark Plasma Sintered Fe–Cr–B Metamorphic Alloy Powder

Influência da corrente e granulometria do material de adição nos revestimentos processados por PTA

Peculiarities of heavy electro-mechanical plating on medium carbon steel 30 and 38 ChN3MA

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