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ArticleName Relation between anomalies of ferrum physical properties at ∼650 °C with possible transformation in it
DOI 10.17580/cisisr.2017.01.05
ArticleAuthor K. Yu. Shakhnazarov, E. I. Pryakhin

St. Petersburg State Mining University (St. Petersburg, Russia):

K. Yu. Shakhnazarov, Cand. Eng., Associate Prof., the Chair of Material Science and Technology of Art Objects, e-mail:
E. I. Pryakhin, Dr. Eng., Prof., the Chair of Material Science and Technology of Art Objects


According to the researches by G. Tamman, E. Gudremon, A. A. Bochvar, A. M. Samarin and B. G. Livshits, any property is suitable for detecting of transformation: bending or extremal value on a curve. Transformations in ferrum at the temperature below 700 °С have been discussed many times. V. S. Meskin denies transformation at the temperature below 700 °С without any references, but at the same time he refers to the data by G. N. Mekhed and A. Sover that testify about the contrary conclusions (minimal values of  and number of torsion twistings at 600 °С). The paper presents analysis of extremal values on the curves (strength of upsetting resistance, parameters of fine structure and metallographic structure) in dependence on temperature, as well as multiple literature data on anomalies of physical and mechanical properties if ferrum and steels. Based on the above-mentioned, transformation at ~650 °C is declared. Recognition of transformation at the preset temperature is one of the ways allowing to formulate the version of the nature of embrittlement of forged (P. Oberhoffer) or quenched (E. Gudremon) or cold-worked (E. Gudremon, G. A. Kashchenko) steel after tempering (annealing) at the temperature above ∼ 650 °C. Other variants of considered metal post-treatment are presented by isothermal austenite transformation (M. Gensammer) and gigantic diffusion (Yu. I. Ustanovshchikov) at the same temperature as well as a “wonderful fact” of transformation in pearlite during seconds at the temperature 670 – 630 °C (V. M. Schastlivtsev).

keywords Polymorphism, ductility, relative elongation, relative narrowing, impact strength, heat capacity, heat conductivity, magnetostriction, tempering brittleness

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Full content Relation between anomalies of ferrum physical properties at ∼650 °C with possible transformation in it