Fracture mechanisms in sintered steels with 3.5%(wt.) Mo

Candela, N.; Velasco, F.; Torralba, J. M.

doi:10.1016/s0921-5093(98)00865-x

Cited by 19 publications

(16 citation statements)

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“…Beyond 10 m, the surface strain hardens resulting in a stabilization of the coefficient of friction. The C f stabilizes at 0.5 for the Fe0.4C2Cu2Ni0.7Mo sample and at 0.6 for the sample containing 0.6% C. This is explained by an increased content of free graphite in the structure; and it is known that graphitization is accelerated by the presence of elements such as Ni and Cu [31]. These elements, by their action on the thermodynamic carbon activity, promote graphitization thus creating graphite nodules, which act as lubricant.…”

Section: Friction Coefficient and Wear Behaviour Of Sintered And Nitrmentioning

confidence: 95%

Effect of Liquid Salt Bath Nitrocarburizing on Mechanical Properties of Low-Alloy Sintered Steels

Serrai¹,

Mechachti²,

Benchiheub³

et al. 2018

Metallofiz. Noveishie Tekhnol.

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The purpose of this study is to produce Fe-2Cu-2Ni-0.7Mo-XC steels by means of the powder metallurgy at different sintering temperatures. The mechanical properties of sintered steels have recently reached a level equivalent to that of steels produced by other processes. The static and dynamic mechanical properties of parts made of sintered steel depend on density and microstructure. Many process parameters such as initial composition, alloying elements, atmosphere, time, sintering temperature, and nitrocarburizing influence the microstructure of steel parts. The compacts' preparation involves powder mixing, cold pressing at 500 MPa, and sintering at 1250 C within the H 2 atmosphere for 2 hours and 25 min. The influence of sintering temperature on both hardness and microstructure of the steel is investigated. In this study, sintered Fe-2Cu-2Ni-0.7Mo-XC-type steels are developed. The impact of nitrocarburizing on this structure is evaluated. Microscopy, SEM, and destructive testing are used for characterization of the sintered steels.

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Section: Friction Coefficient and Wear Behaviour Of Sintered And Nitrmentioning

confidence: 95%

Effect of Liquid Salt Bath Nitrocarburizing on Mechanical Properties of Low-Alloy Sintered Steels

Serrai¹,

Mechachti²,

Benchiheub³

et al. 2018

Metallofiz. Noveishie Tekhnol.

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“…11c se puede ver una rotura frágil transgranular en (Fig. 11c), junto con unos huecos en menor cantidad de la deformación dúctil del acero sinterizado EXT (Candela et al, 1999). La fractura dúctil de acero INT se puede observar en la Fig.…”

Section: Análisis Microestructuralunclassified

Aceros sinterizados al Mo con gradiente funcional

2016

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RESUMEN:Los materiales con gradiente funcional (FGM), los multimateriales, tratan de satisfacer los numerosos requerimientos demandados a las piezas con una combinación determinada de composiciones y microestructuras. La compatibilidad necesaria entre materiales condiciona el proceso de fabricación y el logro de una interfase, no siempre difusa. La metalurgia de polvos es una de las técnicas empleadas en la fabricación de materiales con gradiente funcional y, en concreto la compactación en matriz una de las posibles técnicas de conformado de estos materiales. En el presente trabajo se propone un proceso de conformado de un acero con gradiente funcional que varía su composición entre un acero con alto contenido en molibdeno y cobre y otro acero con cobre, sin molibdeno, con el objeto de concentrar este elemento en la superficie de la pieza, incrementando las propiedades mecánicas. El estudio se completa con la evaluación de propiedades físicas (densidad y distribución de porosidad), propiedades mecánicas (dureza, resistencia a tracción y alargamiento) y análisis microestructural mediante microscopía óptica y electrónica de barrido. ABSTRACT: Functionally Graded Mo sintered steels. Functionally graded materials (FGM), the multimaterials, strive to satisfy the numerous requirements demanded of parts in a given combination of compositions and microstructures. The required material compatibility lead the manufacturing process and the achieving of an interface, not always diffuse. Powder metallurgy is one of the techniques used in manufacturing functionally graded materials, in particular the compaction matrix of the possible techniques for forming these materials. In this paper, a process of forming a functionally graded steel based on the use of a high molybdenum steel with cooper and other steel with copper, without molybdenum, is proposed with the aim of concentrating this element to the surface of the workpiece, increasing the mechanical strength. The study is completed with the evaluation of physical properties (density and porosity distribution), mechanical properties (hardness, tensile strength and elongation) and microstructural analysis by optical and scanning electron microscopy. PALABRAS CLAVE:

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“…These materials can be heat treated [14], and there are studies regarding their fracture behaviour [15]. The influence of heat treatment on wear properties has also been evaluated [16].…”

Section: Introductionmentioning

confidence: 99%