Marina Polyakova

Protypology: A new stage in the standardization of metal products

Standardization is analyzed as a scientific discipline. The science of standardization may be referred to as protypology. On that basis, the stages in the development of standards for various types of carbon-steel products with ultrafine-grain structure are discussed.

Investigation of Microstructure and Mechanical Properties of Carbon Steel Wire after Continuous Method of Deformation Nanostructuring

The continuous method of wire deformation nanostructuring is developed on the basis of simultaneous applying of tension deformation by drawing, bending deformation when going through the system of rolls and torsional deformation on a continuously moving wire. The patent for an invention of the Russian Federation patent office is got. The efficiency estimation of the developed continuous method of deformation nanostructuring was carried out using wire made of medium and high-carbon steels containing 0.2 and 0.75 % C. The wire processed by this method has a uniform ultra-fine grain structure across the cross-section without internal discontinuities that indicates the possibility of combining different deformation schemes for achieving this type of structure in wire. Not only increasing strength properties of carbon steel wire is achieved after this method but increasing plastic properties occurs at the same time.

Forming ultrafine-grain structure in steel wire by continuous deformation

Attention focuses on means of increasing the strength of steel wire, without loss of plasticity. A fundamentally new continuous method of free extension in bent uniform channels permits the formation of ultrafine-grain wire structure.

Adaptive Approach to Quality Management in Combined Methods of Materials Processing

One of the requirements of the modern materials market is the stable balance between the manufacturer and customer interests. However in order to improve the competitive edge the manufacturer should be able to adapt well to the changing market conditions. This feature is especially important when the manufacturer only starts producing the products with improved consumer properties. The article is concerned with the concept of real-time technological adjustment of quality ratings to external impact and the development of the new combined method of carbon wire plastic deformation resulting in improving its mechanical properties is given as an example. The proposed concept is based on the principle of complex technological systems generation on the basis of precedent selection as well as on the application of vertical and horizontal adaptation. The authors show the results of complex theoretical and experimental investigation of various technological operations influence of the developed method on formation of the wire mechanical characteristics.

Effect of Microstructure and Mechanical Properties Formation of Medium Carbon Steel Wire through Continuous Combined Deformation

The combination of different types of deformation can create a continuous method that ensures the formation of ultrafine-grain structure in medium carbon steel wire. The method is based on drawing operation combined with torsion and bending. Tools and equipment applied in the wire and cables manufacturing are used for the implementation of this method. As a result of the combined strain effect the ultrafine homogeneous structure is formed in the medium carbon steel wire. The wire has increased strength while maintaining the plastic properties when compared with the corresponding properties after drawing.

Influence of hybrid plastic deformation on the microstructure and mechanical properties of carbon-steel wire

Since the mechanical properties of metals and alloys with ultrafine-grain structure are of great practical interest, the development of continuous methods of intense plastic deformation deserves attention. The introduction of nanostructuring methods in existing production processes is subject to numerous constraints, mainly associated with the dimensions of the machined workpiece. Continuous methods of intense plastic deformation must be introduced, with corresponding gains of expediency and productivity. The combination of different types of plastic deformation is promising. Carbon-steel wire is studied in the present work. If drawing is combined with external loading, its applicability in wire production may be greatly expanded. If drawing is combined with flexure and torsion, a new production technology may be developed for the production of ultrafine-grain components. In this approach, continuously moving wire is subjected to tensile deformation (by drawing), flexural deformation (on passing through a system of rollers), and torsional deformation. The instruments employed are versatile and compatible with existing industrial equipment. If drawing is combined with flexure and torsion, the carbon-steel wire produced are characterized by ultrafinegrain structure. This approach permits modification of the mechanical properties of the wire over a broad range, without loss of strength or plasticity.

Technological Inherited Connections in Continuous Method of Deformational Nanostructuring

It is proposed to study technological processes of metal ware production as a consequence of macroscopic, microscopic and submicroscopic building typical for an initiate structure, transformed by phases or structurally. It makes possible to use the technological heredity theory in order to predict product quality. This approach is shown on the example of continuous method of deformational nanostructuring. It allowed to formulate the basics of the assessment strategy of various multistage processes of material processing in terms of achieving the required set of properties.

Effect of Stress-Strain State during Combined Deformation on Microstructure Evolution of High Carbon Steel Wire

It is shown that new methods of severe plastic deformation design require combining different methods of plastic deformation. As for carbon steel wire, using drawing as a basic operation is obvious. The combination of drawing with bending and twisting was estimated by the stress-strain uniformity complex. It allows choosing the deformation processing conditions which ensure the uniform stress-strain state in each point of the carbon steel wire cross section. Based on such combination, a new method for manufacturing of semi-products with ultra fine grain structure by drawing with torsion was developed. The combination of wire drawing in two consecutively arranged dies with simultaneous bending and torsion allows achieving complex stress-strain state of the processed metal and ensure the share stresses. Metallographic investigation shows that such scheme of combined plastic deformation provides the uniformity of metal microstructure in its cross section.

Modern Engineering Techniques for Designing Materials with a Specified Set of Properties

In order to design new progressive technological processes for metal ware production it is necessary to use unconventional methods. It is proposed to use the main aspects of TRIZ methodology to devise the new method of carbon steel wire processing. It is suggested to combine different operations of carbon steel wire production. It allows to achieve the different combination of strength and ductile properties of carbon steel wire with one diameter and carbon content. Metallographic investigations showed that microstructure of carbon steel wire after combined deformation is uniform and can be classified as ultra fine grain one. It is proved that TRIZ methodology makes it quicker the development of new methods of metal ware production which are very perspective from the market demands.

New View to Quality Assessment and Decision Making

This paper contains main principles of function-oriented analysis. This approach may be used to estimate the product quality from the point of view of its consumer properties. The object and its components are studied in terms of the functions they fulfill, which corresponds to the degree of satisfaction of the customer requirements (or expectations). It makes possible to find out the relation between the consumer functions and the product properties and determines the practical ways of quality improvement. It is proved that the function-oriented analysis can be used efficiently for both current metal products and for research and design of up-to-date engineering and manufacturing systems.