Effect of chemical composition and production parameters on nanostructured component formation and a set of properties for high-strength low-alloy structural steels

Rodionova, I. G.; Зайцев, А. И.; Shaposhnikov, N. G.; Chirkina, I. N.; Покровский, А. М.; Nemtinov, A. A.; Mishnev, P. A.; Kuznetsov, V. V.

doi:10.1007/s11015-010-9301-6

Cited by 7 publications

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“…5a), despite some enlargement of the grains (from 4 to 6 μm) [22][23][24]. This is associated with increased supersaturation of the solid solution before winding and correspondingly with increased contribution of dispersional hardening.…”

Section: Production Of High Strength Microalloyed Steelsmentioning

confidence: 99%

A new generation of economical automotive steel

et al. 2016

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To meet the demands of the auto industry, facilitate import substitution, and improve the global competitiveness of Russian products, there is a pressing need for new high quality economical steels with excellent stamping properties, strength, and corrosion resistance. Between 2001 and 2011, intensive research permitted the development of high technology production processes for a new generation of automotive steels; these technologies have no counterparts around the world. A fundamentally new approach was adopted: the required structure and properties of the metal are obtained by regulating the deposition of non metallic excess phases, the state of the solid solution, the grain boundaries, and the types of impurities at all stages of production. On the basis of extensive research, including more than 1000 trial melts, production technologies for more than 30 grades of automotive steel that match-and in many respects outperformtheir foreign counterparts have been introduced at OAO MMK and OAO Severstal'.

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Section: Production Of High Strength Microalloyed Steelsmentioning

confidence: 99%

A new generation of economical automotive steel

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“…On heating metal for hot rolling there is homogenization to some extent of the concentration of components throughout the metal volume, and also dissolution of phase precipitates present, in particular total dissolution of carbides (carbonitrides) of niobium, vanadium, aluminum nitride, etc. [10,11]. During hot rolling, product cooling proceeds from the surface, which stimulates the formation of new phase precipitates.…”

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“…In order to determine the key production parameters, controlling the intensity of its occurrence, initially low-carbon microalloyed steels were studied. Since the main phase precipitated in the hot rolling temperature range of 800-1200°C normally used is niobium carbide (carbonitride) [10,11], then microalloying systems with niobium, niobium and titanium, and niobium and vanadium were considered. Tests were performed on metal from an industrial melt of three compositions (Table 1).…”

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Mechanisms for Improving Chemical and Structural Homogeneity of Hot-Rolled Product for Objects Prepared by Hot Stamping

et al. 2016

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A. I. Zaitsev, A. V. Koldaev, UDC 669.018.26:621.77.016.2 N. A. Karamysheva, and I. G. RodionovaRedistribution of components forming the structure and properties during hot rolling of microalloyed steels, similar in chemical composition to hardened steels during hot stamping, of an industrial melt containing carbon from 0.098 to 0.219%, is studied in detail. It is established that a key production parameter controlling the intensity of occurrence of these processes is the temperature at the start of rolling in the fi nishing group of stands, i.e., T 6 . An increase in T 6 leads to signifi cant enrichment with respect to carbon content, and a fi ner structure due to the formation of niobium carbonitride precipitates in surface layers compared with the rolled product axial zone. An increase in carbon content and a reduction in the concentration of niobium and other microalloying components within steel reduces the intensity of development of these processes. It has been shown by experiment that signifi cant metal chemical and structural inhomogeneity forming in the continuous billet casting stage may be avoided or signifi cantly reduced during hot rolling on the basis of controlling excess phase precipitation. This leads to a marked increase in the level of production and service properties of both hot-rolled product and metal objects prepared from it by hot stamping. Improvement of the reliability and operating effi ciency of heavy-duty components, transport, heavy-lifting, mining, agricultural, and other engineering objects requires an increase in strength properties, resistance to corrosion, and corrosion-mechanical breakdown, and the reliability of steels used for their manufacture. As a rule, an increase in strength leads to a sharp reduction in ductility, which makes it diffi cult or impossible to prepare components of complex shape. An original outcome from this situation is use of hot stamping methods based on converting steel with a normal ferrite-pearlite microstructure and relatively low strength, as a rule 500-650 N/mm 2 , by heating in an austenitic condition followed by stamping combined with quenching. In this way, there is conversion of the metal microstructure, mainly into a martensitic structure and multiple increase in strength properties, i.e., ultimate strength up to 2200 N/mm 2 and above. Due to stamping at elevated temperatures, a martensitic microstructure is obtained, there is a reduction in the elastic aftereffect from hot-rolled product, and thin components of complex shape may be prepared with good specifi c strength and geometric precision [1][2][3][4][5].The results of research indicate that a key parameter controlling strength and other service property indices for a metal object prepared by hot stamping are the characteristics of microstructural fi neness and uniformity of an original hot-rolled product [6,7]. In particular, it has been established that a change-over from a coarse-grained microstructure (ferrite grain

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“…With a reduction in T fr from 820 to 780°C steel's yield strength increases, which to all appearances is connected with the precipitation of VC carbide, and this starts in fact at 780-790°C in the upper range of the two-phase (γ + α)-region. Yield strength decreases with an increase in T co from 490 to 530°C (see Table 1), and this may be connected with steel tempering during strip cooling and a slowdown in carbide (carbonitride) particle precipitation in this temperature range due to low carbon diffusion mobility [3,8]. A further increase in temperature, starting from 540°C leads to an increase in yield strength, which is apparently connected with the prevalence of strengthening processes as a result of dispersion hardening over self-tempering processes.…”

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Development of a New Generation of High-Strength Low-Carbon Microalloyed Steels for the Main Layer of Clad Rolled Product

et al. 2015

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The importance is demonstrated of developing new low-carbon high-strength steels for a marked improvement in both mechanical and service properties of the main metal layer, strength and continuity of joined layers, and also quality characteristics of corrosion-resistant clad rolled product as a whole. In order to resolve this problem on the basis of original methods of physicochemical prediction, a new low-carbon highstrength steel is created of weldable economically alloyed steel, and its main production technology is developed. It is shown that in order to achieve simultaneously high indices of strength (yield strength more than 700 MPa, strength more than 850 MPa), ductility (relative elongation more than 17%), and other steel service properties, nanostructuring is of prime importance, realized with relatively slow metal cooling rates typical for preparing clad rolled product. Keywords: high-strength corrosion-resistant clad rolled product, main layer, high-strength low-carbon microalloyed steels, electroslag surfacing, material layer compatibility, strength, ductility, strength mechanisms, weldability, structural state, excess phase precipitation.New installations of power generation, chemical, petrochemical, coke chemistry, oil processing, and a number of other branches of industry function under conditions of extreme action of corrosive media, high temperature, pressure, variable mechanical and thermal loads, etc. In view of this, readily weldable metal materials are required in order to manufacture their components, exhibiting good corrosion resistance, high strength, ductility, and a number of other properties that are difficult to combine. Realization of a set of the properties listed in monometal material is impossible, especially considering solution of the problem for reducing material and energy consumption, and economic consumption of scarce and expensive alloying elements. Therefore, for these purposes it is promising to use high-strength corrosion-resistant clad steels that are readily weldable. Their high structural strength is provided due to the use of high-strength structural steels as a supporting layer.The range of clad steels produced by electroslag surfacing is quite limited [1]. It includes composites consisting of the main layer (steels St3, 10, 20, 09G2S) with low strength properties (ultimate strength does not exceed 600 N/mm 2 ), clad with corrosion-resistant steel of ferritic (type Kh13) or austenitic (type Kh18N10T) classes. Low strength and, as a conse-

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Effect of chemical composition and production parameters on nanostructured component formation and a set of properties for high-strength low-alloy structural steels

Cited by 7 publications

References 1 publication

A new generation of economical automotive steel

A new generation of economical automotive steel

Mechanisms for Improving Chemical and Structural Homogeneity of Hot-Rolled Product for Objects Prepared by Hot Stamping

Development of a New Generation of High-Strength Low-Carbon Microalloyed Steels for the Main Layer of Clad Rolled Product

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