Abrasive wear in Austempered Ductile Irons: A comparison with white cast irons

Cardoso, Paulo Henrique Sanchez; Israel, Charles Leonardo; Strohaecker, Telmo Roberto

doi:10.1016/j.wear.2014.02.009

Cited by 33 publications

(11 citation statements)

References 14 publications

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“…ADI components used in these areas are often subjected to adhesive, abrasive, fatigue, or erosive wear. Cardoso et al [14] aimed to evaluate the mechanical properties and the abrasive wear resistance of a group of nodular cast irons and a white cast iron, while Zhang et al [15] recently investigated ADI with three strength grades matched with high-carbon-chromium bearing steel, and the rolling-sliding wear tests under high contact load were conducted on an Amsler-type tribotester. And in other aspects, the influence of sliding speed, [16] austempering temperature, [17][18][19] microstructure, [20,21] graphite shape [22,23] , and alloying element [24][25][26][27] has been investigated in detail on the wear behavior of ADI.…”

Section: Junjun Cui and Liqing Chenmentioning

confidence: 99%

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Cui

Chen

2015

Metall Mater Trans A

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To further improve the mechanical performance of a new type of alloyed bainitic wear-resistant ductile iron, the effects of the various austempering temperatures have been investigated on microstructure and mechanical behaviors of alloyed ductile iron Fe-3.50C-1.95Si-3.58Ni-0.71Cu-0.92Mo-0.65Cr-0.36Mn (in weight percent). This alloyed ductile iron were firstly austenitized at 1123 K (850°C) for 1 hour and then austempered in a salt bath at 548 K, 573 K, and 598 K (275°C, 300°C, and 325°C) for 2 hours according to time-temperature-transformation diagram calculated by JMatPro software. The microstructures of austempered wearresistant ductile irons consist of matrix of dark needle-like ferrite plus bright etching austenite and some amount of martensite and some dispersed graphite nodules. With increasing the austempering temperature, the amount of ferrite decreases in austempered ductile iron, while the amount of austenite and carbon content of austenite increases. There is a gradual decrease in hardness and increase in compressive strength with increasing austempering temperature. The increased austenite content and coarsened austenite and ferrite can lead to a hardness decrease as austempering temperature is increased. The increased compressive strength can be attributed to a decreased amount of martensitic transformation. The alloyed ductile iron behaves rather well wear resistance when the austempering is carried out at 598 K (325°C) for 2 hours. Under the condition of wear test by dry sand/rubber wheel, the wear mechanisms of austempered ductile irons are both micro-cutting and plastic deformation.

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Section: Junjun Cui and Liqing Chenmentioning

confidence: 99%

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Cui

Chen

2015

Metall Mater Trans A

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“…DCIs are ferrous alloys that are comprised of graphite elements within a ferritic matrix, where the graphite elements, usually called graphite nodules, are characterized by a semi-spherical shape [2]. Because of the particular geometry of the graphite nodules, the DCIs have good characteristics, such as excellent mechanical properties, machinability characteristics, superior corrosion, and abrasive resistance [3][4][5][6]. The different DCIs mechanical properties, such as, high values of tensile strength and Young's modulus, among others [7], are some of the reasons that make DCIs very versatile for different engineering fields such as the automotive industry, mining industry, among others [8,9].…”

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm-Based Optimization Methodology of Bézier Curves to Generate a DCI Microscale-Model

et al. 2017

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Abstract:The aim of this article is to develop a methodology that is capable of generating micro-scale models of Ductile Cast Irons, which have the particular characteristic to preserve the smoothness of the graphite nodules contours that are lost by discretization errors when the contours are extracted using image processing. The proposed methodology uses image processing to extract the graphite nodule contours and a genetic algorithm-based optimization strategy to select the optimal degree of the Bézier curve that best approximate each graphite nodule contour. To validate the proposed methodology, a Finite Element Analysis (FEA) was carried out using models that were obtained through three methods: (a) using a fixed Bézier degree for all of the graphite nodule contours, (b) the present methodology, and (c) using a commercial software. The results were compared using the relative error of the equivalent stresses computed by the FEA, where the proposed methodology results were used as a reference. The present paper does not have the aim to define which models are the correct and which are not. However, in this paper, it has been shown that the errors generated in the discretization process should not be ignored when developing geometric models since they can produce relative errors of up to 35.9% when an estimation of the mechanical behavior is carried out.

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“…An ordinary method against abrasive wear on metals, technically referred as hardfacing, is the application of a special alloy on a metal surface subjected to wear process by the deposition of weld beads. This method is currently being used quite effectively [1][2][3] . The hardfacing is the application of a hard metal with considerable wear resistant on the surface of a component by welding, metallization or combination of welding processes with the aim to reduce the material loss by abrasion, impact, erosion, surface slip and cavitation 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Pushing and Pulling the Electrode Procedure and Addition of Second Layer of Welding on the Wear in Hardfacing of Fe-Cr-C

et al. 2016

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The aim of this work is evaluate the influence of welding conditions on abrasive wear resistance in coating of Fe-Cr-C. The metal base used in this investigation was the steel SAE 1020 and as welded metal the selfshilded tubular wires of Fe-Cr-C with 1.6 mm of diameter. The welding parameter such as amperage, voltage, welding speed, wire feed speed and the distance between the point and samples were kept constant by varying the electrode inclination and the number of layers deposited. These resulted in four different weld conditions: pulling and pushing the weld pool and hardfacing formed with 1 end 2 layers. Their influences on dilution, microhardness and microstructure were evaluated and correlated with the abrasive wear according to the standard tests methods for abrasion measurements through the usage of dry sand/rubber wheel apparatus, ASTM G-65-04. The results showed that the wear resistance of the four different conditions was affected by dilution, microstructure morphology and carbide volume fraction. The best conditions for hardfacing deposition were for pushing the torch and two layers added.

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Abrasive wear in Austempered Ductile Irons: A comparison with white cast irons

Cited by 33 publications

References 14 publications

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Genetic Algorithm-Based Optimization Methodology of Bézier Curves to Generate a DCI Microscale-Model

Influence of Pushing and Pulling the Electrode Procedure and Addition of Second Layer of Welding on the Wear in Hardfacing of Fe-Cr-C

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