Sructure and properties of low-alloy construction steels modified by nanodispersed compositions

Authors

  • V. I. Bolshakov Dr. Sc. (Tech.), Prof., Ukraine
  • A. V. Kalinin Ph. D., Assos. prof., Ukraine

Keywords:

nanomodifiеr, steel, structure, crystallization, aunstenite, mechanical properties

Abstract

Annotation. Purpose. The study of structure formation and improvement of the complex mechanical properties of structural steels, modified nanocomposite refractory carbide and carbonitride class. Metodology. Nanoparticle powders (Ti (C, N), TiC, TiN, SiC) fraction obtained 50..100 nm plasmochemical synthesis in plants. Laboratory and experimental industrial smelting low alloy steels 09G2 and 09G2S. Briquettes modifier size Ø30 × 10 mm were introduced under a stream of liquid metal in an amount 0,1..0,2% of melt weight. Results. It shows the change in free energy of the system depending on the radius of the embryo austenite. The critical radius of a nucleus in the crystallization of austenite steels. The optimal size range embryos at overcooling austenite from 10 to 40 ° C. X-ray analysis proved the existence of inclusions Ti (C, N). The modified performs increase strength properties to 19 ... 33%, plastic properties  to 11 ... 17%, impact strength to 31 ... 39%. Originality.  Crystallization set thermodynamic conditions of the steel melt containing nanoparticles modifiers. The calculation of the size of the austenite critical nuclei of between 45 to 12 nm. Practical value. The results are used to improve the mechanical properties and performance of building structures.

Author Biographies

V. I. Bolshakov, Dr. Sc. (Tech.), Prof.

кафедра материаловедения и обработки материалов, Государственное высшее учебное заведение «Приднепровская государственная академия строительства и архитектуры», ул. Чернышевского, 24-а, 49600, Днепр, Украина

A. V. Kalinin, Ph. D., Assos. prof.

кафедра материаловедения и обработки материалов, Государственное высшее учебное заведение «Приднепровская государственная академия строительства и архитектуры» (ПГАСА), ул. Чернышевского, 24-а, 49600, Днепр, Украина

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Published

2017-03-25

Issue

Section

Proceedings in memory of Starodubov