Effective Technological Process of Crystallization of Turning Rollers' Massive Castings: Development and Analysis
International Journal of Mineral Processing and Extractive Metallurgy
Volume 2, Issue 3, May 2017, Pages: 34-39
Received: Jun. 20, 2017; Accepted: Jul. 12, 2017; Published: Jul. 27, 2017
Views 2526      Downloads 90
Authors
Tamara Skoblo, Repair Technological Systems Department, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Oksana Klochko, Technology of Materials Department, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Efim Belkin, Repair Technological Systems Department, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Aleksandr Sidashenko, Repair Technological Systems Department, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Article Tools
Follow on us
Abstract
The paper describes a new method of maximum reducing residual stresses and stabilization of the structure, hardness of the working layer of massive sheet rolls from alloyed cast irons during their crystallization due to controlled decomposition of retained austenite. It is achieved by programmable preheating of the metal form to the temperature of magnetic transformation of doped cementite or special carbides of the castings (depending on the material being processed); meanwhile it is provided an optimum cooling rate with an exposure of up to 6 hours in this interval and maximizes decomposition of retained austenite, minimizes stresses in the working layer. This casting technology is also accompanied by appropriate structural changes. Inhomogeneity of the dislocation structure is noted in various constituent phases. Polygonization and fragmentation along dislocation walls are revealed in the carbide phase. To evaluate the occurring processes, a new method of optical and mathematical description of the phases being formed is used. As a criterion describing the changes in the dislocation structure, we use the parameter - a power dissipation power function. The proposed casting technology for rolls is particularly effective when the proportion of the carbide phase is at least 25%. In this case, the heat treatment of the rolls to relieve stress does not change the stably achieved properties. It is shown that the quality control on the stability of the achieved indicators can be carried out by the coercive force and the level of hardness.
Keywords
Alloyed Cast Iron, Crystallization, Double-Layered Rolls, Decomposition of Retained Austenite, Coercive Force, Hardness, Heterogeneity
To cite this article
Tamara Skoblo, Oksana Klochko, Efim Belkin, Aleksandr Sidashenko, Effective Technological Process of Crystallization of Turning Rollers' Massive Castings: Development and Analysis, International Journal of Mineral Processing and Extractive Metallurgy. Vol. 2, No. 3, 2017, pp. 34-39. doi: 10.11648/j.ijmpem.20170203.12
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
References
[1]
T. S. Skoblo et al. Proizvodstvo i primenenie prokatnyh valkov [Production and use of casting rollers]. Spravochnik: pod red. prof. T. S. Skoblo – Kharkiv: CD №1, 2013, 572 p. [in Russian].
[2]
T. Kudo, S. Kawashima, R. Kurahashi. Development of Monobloc Type High-carbon High-alloyed Rolls for Hot Rolling Mills // ISIJ International. - Vol. 32, 1992, No.11, pp. 1190-1193.
[3]
T. S. Skoblo, V. Tokmakov. Application of hard alloy rolls for high quality rolling // Chern. Met. - Bul. NTI, 1992, Vol. 6, pp.3-18.
[4]
E. N. Vishnyakova, T. S. Skoblo et al. The Production of Rolling Mill Rolls From High-Chromium Cast Iron // Metall. Gornorudn. Prom-st. – 1987, No.1, pp.28-30.
[5]
T. S. Skoblo, N. M. Voroncov, S. I. Rudyuk. Prokatnye valki iz vysokouglerodistyx splavov [Rolling rolls made of high-carbon alloys]: pod. red. T. S. Skoblo. – M.: Metallurgiya, 1994. – 336 p. [in Russian].
[6]
Skoblo T, Sandler N, Govor U. Mechanical properties, wear-resistance, and use of cast iron alloyed with vanadium and niobium for rolling rolls // Chernaya metalluriya. - 1967, pp.115-119.
[7]
V. M. Kolokoltsev, E. V. Petrochenko. Structure features and properties of high-alloy white irons // Vestnik of Nosov Magnitogorsk State Technical University. – 2013, No.5, pp.3-8.
[8]
A. Wiengmoon, J. T. H. Pearce, S. Nusen, T. Chairuangsri. Effects of Si on microstructure and phase transformation at elevated temperatures in ferritic white cast irons // Materials Characterization. - October 2016, Vol.120, pp.159-167.
[9]
T. S. Skoblo, O. Yu. Klochko, A. I. Sidashenko, R. G. Sokolov. Heat treatment of two-layer alloyed-iron rollers // Steel in Translation. – September 2013, Vol. 43, Issue 9, p. p. 603-606.
[10]
D. Kopyciński, E. Guzik, D. Siekaniec, A. Szczęsny. Analysis of the High Chromium Cast Iron Microstructure after the Heat Treatment // Archives of foundry engineering. – Vol. 14, Issue 3/2014, pp.43-46.
[11]
O. Yu. Klochko. Vlijanie nizkotemperaturnoj ciklicheskoj termoobrabotki na strukturnuju neodnorodnost' v massivnyh otlivkah iz vysokohromistogo kompleksnolegirovannogo chuguna [Effect of low-temperature thermal cycling on structural heterogeneity within massive castings from high-chromium complex-iron] // Vіsnik of HNTUSG. - Vol.101, 2010, pp.73-77 [in Russian].
[12]
O. I. Nikitina, S. V. Spirina, E. P. Gubenko, T. S. Skoblo, V. P. Danilenko. Isolation of Carbide Phase in Chromium-Nickel and High-Chromium Cast Iron With a Potentiostatic Method // Ind. Lab.(USSR). – 1979, 45 (11), pp.1214-1217.
[13]
T. S. Skoblo, E. N. Vishnyakova et al. Thermodynamic evaluation of carbide phase precipitation in high-chromium cast irons //Metallovedenie i Termicheskaya Obrabotka Metallov.-1990, No.1., pp.56-59.
[14]
A. I. Sidashenko, T. S. Skoblo, O. Yu. Klochko et al., Ukrainian patent UA 105761, Byull. Izobret., 2016, No. 7.
[15]
T. S. Skoblo, O. Yu. Klochko, E. L. Belkin. Structure of high-chromium cast iron. Steel in Translation. – March 2012, Volume 42, Issue 3, pp. 261-268.
[16]
T. S. Skoblo, O. Yu. Klochko, E. L. Belkin. Primenenie kompjuternogo analiza metallograficheskih izobrazhenij pri issledovanii structury vysokohromistogo chuguna [The use of computer analysis of metallographic images in the study of high-chromium cast iron structure] // Zavodskaya laboratoriya. Diagnostika materialov. – 2012, 6 (78), pp.35-42 [in Russian].
[17]
Patrick J. Roache. Fundamentals of Computational Fluid Dynamics. Publisher: Hermosa Pub, 1998, 648 p.
[18]
T. S. Skoblo, E. L. Belkin, O. Y u. Klochko. Obosnovanie primenenij ponyatij uravnenij gidrodinamiki Navje-Stocksa dlya analiza mettalographicheskih izobrazhenij [Application justification of the concepts of fluid dynamics Navier-Stokes equations for the analysis of metallographic images] // Materiały VII Mięzdynarodowej naukowi-praktycznej konferencji. – Przemyśl: 2011, Vol. 21, p. p.94-96 [in Russian].
[19]
T. S. Skoblo. Field Emission Microscope Applied to Study of Structure and Properties of Cast Iron // Ind. Lab. – 1972, Vol.38 (8), pp.1217-1219.
[20]
M. F. Ashby. The deformation of plastically non-homogeneous materials // Philosophical Magazine. - Vol. 21, 1970, pp. 399-424.
[21]
K. Ammar, B. Appolaire et al. Modelling inheritance of plastic deformation during migration of phase boundaries using a phase field method // Meccanica. - August 2014, Springer.
ADDRESS
Science Publishing Group
1 Rockefeller Plaza,
10th and 11th Floors,
New York, NY 10020
U.S.A.
Tel: (001)347-983-5186