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Numerical and experimental analysis of the forging of a bimetallic crosshead

Rosiak André, dos Santos Thomas Gomes, Alba Diego Rafael, Schaeffer Lirio

Advances in Materials Science

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2023

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Vol. 23, nr 4(78)

37--47

EN

The automobile sector has been making increasing efforts to reduce the weight of automobiles, aiming at mitigating pollutant gas emissions. The use of innovative concepts, such as bimetallic components, has become attractive because it makes it possible to increase the strength-to-weight ratio of the components. In this study, the hot forging of a bimetallic crosshead is investigated. In the process, a billet with a cylindrical core of the magnesium alloy AZ61 is enclosed with a hollow cylinder of the aluminum alloy AA 6351 and forged at 400°C. The objective is to reconcile the low density of Mg alloys with the high corrosion resistance of Al alloys. In parallel, a finite element analysis of the process was carried out.

2

A theoretical analysis of bi-metallic (Cu-Ag)(n=1) (-) (7) nano alloy clusters invoking DFT based descriptors

Ranjan P., Dhail S., Venigalla S., Kumar A., Ledwani L., Chakraborty T.

Materials Science Poland

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2015

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Vol. 33, No. 4

719--724

EN

Due to its large scale applications in the real field, the study of bi-metallic nano-alloy clusters is an active field of research. Though a number of experimental reports are available in this domain, a deep theoretical insight is yet to receive. Among several nano-clusters, the compound formed between Cu-Ag has gained a large importance due to its remarkable optical property. Density Functional Theory (DFT) is one of the most popular approaches of quantum mechanics to study the electronic properties of materials. Conceptually, DFT based descriptors have turned to be indispensable tools for analyzing and correlating the experimental properties of compounds. In this venture, we have analyzed the experimental properties of the (Cu-Ag)n= 1 - 7) nano-alloy clusters invoking DFT methodology. A nice correlation has been found between optical properties of the aforesaid nano-clusters with our evaluated theoretical descriptors. The similar agreement between experimental bond length and computed data is also reflected in this analysis. Beside these, the effect of even-odd alternation behavior of nano compounds on the HOMO-LUMO gap is very important in our computation. It is probably the first attempt to establish such type of correlation.

3

Studies of the transition zone in steel - chromium cast iron bimetallic casting

Tenerowicz S., Suchoń J., Cholewa M.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1

199-204

EN

In this work authors presented the results of transition zone studies on steel - cast iron interface in bimetallic casting. During the investigations cylindrical castings with different diameter were prepared of cast iron with steel rods placed in the center. From each bimetallic casting a microsection was prepared for microhardness tests and metalographic analysis, consisting of transition zone measurement, point and linear analysis as well as quantitative analysis.

4

Enrichment of surface of low-alloyed cast iron with use of austenite layer

Szajnar J., Cholewa M., Tenerowicz S., Wróbel T.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1

187-190

EN

In paper is presented method of obtainment of bimetallic casting for lining of quenching car to coke production. In range of studies were made bimetallic casting of cast iron with chromium-nickel steel plates for their different thickness, researches of joint quality with use of ultrasonic method, metallographic examinations of microstructure and researches of selected usable properties.

5

Characterization and catalytic properties of supported Ni-Rh catalysts in CO2 reforming of methane.

Rynkowski J., Jóźwiak W., Nowosielska M.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

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2002

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Vol. 10, nr 57

87-93

EN

A series of silica supported rhodium-nickel catalysts with varying amounts of both components have been characterized by temperature-programmed reduction, X-Ray diffraction, hydrogen chemisorption and tested in the CO2 reforming of methane reaction. The reduction of bimetallic catalysts occurs at lower temperatures, as compared to a monometallic nickel catalyst, showing that rhodium and nickel are in close interaction. XRD results Indicate the formation of Ni/Rh alloys in the process of bimetallic catalysts reduction. All catalysts under study show high activity in the reaction of CO2 reforming of methane, but the significant improvement in the stability is characteristic for rhodium and bimetallic catalysts.

6

A modified flow field in the extrusion of bimetallic systems

Śliwa R. E., Mishuris G. S.

Engineering Transactions

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1999

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Vol. 47, iss. 2

203-215

EN

The aim of the paper is to propose a new kinematically admissible velocity field corresponding to experimental results of the co-extrusion of various materials. A modified mathematical description of the plastic flow in the extrusion of the bi-metallic composite including boundaries of the plastic zone described by appropriate function has been proposed. Velocities, grid distortion and strain rate distribution have been calculated by taking into account information on the plastic zone boundaries and their forms. Excellent agreement between the analytical and the experimental results of the plastic flow of longitudially oriented metal composite has been established.