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  • 1990-1994  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Phase transformations and heredity in iron-carbon alloys (1991)
    Springer
    Metal science and heat treatment 33 (1991), S. 451-455 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Any phase transformation in steel is accomplished as a result of forming nuclei of a new phase by shear rebuilding of the lattice which is either accompanied by diffusion of carbon and alloying elements, or not. The difference in morphology and kinetics of martensitic and ‘normal’ transformations is connected with relaxation processes at an interphase boundary. 2. A consequence of the shear nature of transformation is the effect of heredity with α→γ-transformation (restoration of grain size, strengthening heredity). The completeness of realizing this effect depends on the degree of dislocation substructure stability. 3. With PTMT the stability of the dislocations structure of α-phase may be corrected by selecting the optimum original steel structure, the method and degree of deformation, and the post-deformation tempering regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00775379
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  • 2
    Electronic Resource
    Electronic Resource
    Different austenite grain size in nonuniformly deformed billets (1991)
    Springer
    Metal science and heat treatment 33 (1991), S. 493-497 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Austenite grain growth kinetics in the range of deformation with a degree less or more than the critical (for steel 15Kh εcr=20%) differ markedly. In the case of considerable deformation grain growth commences at temperatures close to the Ac3 point, but grains coarsen comparatively uniformly. For ε 〈 εcr there is selective intense growth of individual grains even with temperatures above 900°C and prolonged soaking leading to formation of coarser grains and a more different grain structure than in severely worked steel. 2. Production processes of cold extrusion for articles subject to heat or chemical heat treatment should be developed so that the degree of deformation in a blank cross section is less than the critical amount. 3. In nonuniformly deformed blanks with deformation ε 〉 εcr the most uniform and fine grain structure forms as a result of treatment by the following schedules: a) quenching and normalizing with rapid heating to a temperature not above 900°C; b) gas carburizing at t=950–1000°C; c) carburizing in a solid carburizing agent with t=930–950°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00778646
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of cold plastic deformation of austenitic grain size in steel (1992)
    Springer
    Metal science and heat treatment 34 (1992), S. 153-157 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The ferritic grain size Lα of 15Kh steel depends upon the degree of deformation ɛ and the original grain size before deformation. In fine-grained steel deformation with degrees close to the critical leads to coarsening of the grains according to the coalescence mechanism and in coarse-grained to refinement of them. This determines the different character of the Lα=f(ɛ) relationship for original fine- and coarse-grained steel. 2. At the investigated heating rates regardless of the degree of deformation with the exception of εcr the initial austenitic grain size in the fine-grained steel agrees with the grain size of the α-phase at the point Ac1. In deformation with εcr the substructure formed during coalescence influences the austenitic grain size. As the result, after such deformation the austenitic grain size is finer than the ferritic before the start of austenitization. 3. In the austenitic area strongly deformed steel in which a fine grain size was formed before the α→γ-transformation reveals a strong tendency toward grain growth regardless of heating conditions. In accelerated and rapid heating this makes it possible to obtain a more uniform grain size in the cross section of nonuniformly deformed blanks. 4. The generally accepted opinion of refinement of the austenitic structure in deformed steel is valid for original coarse-grained steel but is not confirmed for fine-grained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703626
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