Effect of the Austenitization Route on the Bainitic Reaction Kinetics and Tensile Properties of an Alloyed Austempered Ductile Iron

Pereira, Henrique Boschetti; Tschiptschin, André Paulo; Goldenstein, Hélio; Azevedo, César Roberto de Farias

doi:10.1007/s40962-020-00569-1

Cited by 11 publications

(6 citation statements)

References 58 publications

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“…The presence of secondary graphite in small amounts can increase the self-lubricating effects of the layer and thus decrease the coefficient of friction. However, their formation must be controlled because a large content can gradually decrease the mechanical properties [58]. Wang and Yu [59] deposited high chromium hypoeutectic cast iron (2.6C-22Cr-Fe) on a D32 low-alloy steel substrate.…”

Section: Effects Of Pwht Treatments On Layersmentioning

confidence: 99%

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

et al. 2023

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A TIG surface alloying process was applied to modify the surface of ductile cast iron samples. Using this process, in-situ metal matrix composite (MMC) layers were produced on samples to improve their wear resistance. These layers were made by melting substrates and powders as additional material into this melt pool. The efficiency of preheating of the samples to prevent cold cracks during solidification was verified. Moreover, a buffer layer produced in situ to decrease the mismatches between the chemical and physical properties of the materials was also tested. Post-weld heat treatment (PWHT) was used to increase the tribological characteristics of the layers and eliminate adverse effects of the heat-affected zone (HAZ) created by the fusion of the substrate surface. The results showed that, in the samples without preheating, the formation of cold cracks occurred. Additionally, layers produced without a buffer layer showed defects, such as shrinkage and porosity. However, using both preheating and a buffer layer prevented cold cracks, discontinuities, shrinkage, and porosity defects in the layers. Furthermore, PWHT allowed for the transformation of brittle martensite into tempered martensite at the HAZ. MMC layers presented high hardness of up to 1230 HV and wear resistance up to 5.8 times greater compared to the substrate samples without layers.

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Section: Effects Of Pwht Treatments On Layersmentioning

confidence: 99%

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

et al. 2023

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“…But by applied research, careful control, and application of metallurgical principles our industry has been able to double and triple the strengths obtained from these alloys while still maintaining toughness and ductility, creating custom engineered microstructures with numerous grades and international specifications (Figure 5). 6 This has then opened new markets available to casters and provided the casting user community an expanded array of options not even envisioned those 80 years ago to help make products lighter and stronger though the use of this family of cast metals But even as the base metal reaches a level of maturity, the investigations, understanding, learning and advancement continues. You just need to look at the recent number of papers and issues dedicated to cast iron in the IJMC (International Journal of Metalcasting), like the Carl Loper Cast Iron Symposium issue and the Keith Millis Symposium focus section from last year, to see that change and growth comes from investigation, discussion, and technology transfer.…”

Section: The Power Of Metallurgical Transformationsmentioning

confidence: 99%

Metalmorphasis: Change and Transition

Prucha¹

2021

Inter Metalcast

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Change is constant, as nothing stays the same. Consider the words of the Chinese philosopher Lao Tzu, ''Life is a series of natural and spontaneous changes. Don't resist them-that only creates sorrow. Let reality be reality. Let things flow naturally forward in whatever way they like.'' Some changes are the result of biology and the passage of time, within the natural cycle or order of things. Others are self-generated, under our own control and resulting from willful efforts, or dependent upon encounters with significant others-family, friends, colleagues, and others close to us. Still, other changes occur because of circumstance or fate, a proverbial ''date with destiny'' and often beyond what we feel is our control. Whether it is our personal life or occupational, like metalcasting, this change can facilitate transition and transformation. I have coined the term metalmorphasis and this lecture as reflection of how to embrace change, recognize the opportunities presented and utilize it as a vehicle for new beginnings. This is not just philosophical but also a look how we as metallurgist and metalcasters apply and control input variables (time, temperature, pressure, chemical reactions, etc.) to transform metals and create metalmorphasis.

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“…Until now, many researchers have investigated the effect of various factors in ductile iron, their main focus has been on the effect of the volume percentage of the hard phase on the mechanical properties of ductile iron [12]. Considering the influence of hard phase distribution around graphite spherical particles on the mechanical properties of ductile iron, how this distribution in the microstructure is of great importance [13,14]. Jayashree and Godbole [15] analyzed the microstructures of spherical graphites in cast iron structures using an image processing method.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties prediction of ductile iron with spherical graphite using multi-scale finite element model

Alizadeh,

Ajri,

Maleki

2023

Phys. Scr.

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In this paper, using the multi-scale finite element method, the effect of graphite particles on the mechanical behavior of ductile iron has been investigated under tensile loading. For this purpose, taking into account the spherical geometric shape of the graphite phase and considering a specific volume fraction, these spheres are randomly placed in the whole body and a two-component composite material is created. Next, by defining the mechanical properties of two separate phases including the matrix and graphites as well as the interfaces between these two phases, a micromechanical model is developed for these materials. The mechanical properties of the matrix are simulated using the Ramberg-Osgood elastic-plastic model. By simulation in ABAQUS software and using nonlinear dynamic analysis, the effects of volume percentages and adhesion of graphite particles with matrix on the direct tensile load-displacement behavior of ductile iron were investigated. The results of experimental tests were used to verify the results of the numerical model. The weight percentage of graphite particles has a significant effect on the tensile strength and elastic modulus of these cast irons. The results show that with the increase in the amount of graphite particles, the tensile strength of cast iron increases up to a certain value and then reverses. With 21% graphite particles, the maximum tensile strength of ductile iron is 601 MPa. Compared with a pure sample of cast iron, the tensile strength increases by approximately 13.4% for this weight percentage of graphite particles.

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Effect of the Austenitization Route on the Bainitic Reaction Kinetics and Tensile Properties of an Alloyed Austempered Ductile Iron

Cited by 11 publications

References 58 publications

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

In-Situ Production of Metal Matrix Composites Layers by TIG Surface Alloying to Improve Wear Resistance of Ductile Cast Iron Using a Buffer-Layer and Post Weld Heat Treatment

Metalmorphasis: Change and Transition

Mechanical properties prediction of ductile iron with spherical graphite using multi-scale finite element model

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