The Paton Welding Journal, 2014, №05



2014 №05 (02)

DOI of Article 10.15407/tpwj2014.05.03

2014 №05 (04)

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The Paton Welding Journal, 2014, #5, 16-20 pages  

INVESTIGATION OF THERMAL RESISTANCE OF DEPOSITED METAL DESIGNED FOR RESTORATION OF MILL ROLLS

A.A. BABINETS, I.A. RYABTSEV, I.A. KONDRATIEV, I.I. RYABTSEV and G.N. GORDAN

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
The method of experimental evaluation of thermal resistance of deposited specimens was updated. The new method allows evaluating the nature of propagation of thermal fatigue cracks across the thickness of deposited layer, as well as the effect of deposition of intermediate layers of different composition on thermal resistance of specimens. Using the updated procedure, the investigations of effect of deposition of a plastic sublayer by wire Sv-08A on thermal resistance of specimens, deposited by flux-cored wires PP-Np-35V9Kh3GSF and PP-Np-25Kh5FMS, which are most widely used for restoration and strengthening of hot mill steel rolls, were carried out. Hardfacing of the plastic sublayer allowed increasing the general thermal resistance of deposited specimens by 1.2-1.5 times. In addition, it was found that the plastic sublayer arrests the propagation of thermal fatigue cracks into the base metal, thus preventing, to a certain degree, the fracture of the deposited part. 6 Ref., 1 Table, 5 Figures.
 
 
Keywords: arc hardfacing, hardfacing of mill rolls, multilayer hardfacing, plastic sublayer, thermal resistance, procedure of tests
 
 
Received:                05.02.14
Published:               28.05.14
 
 
References
1. Ryabtsev, I.A., Kondratiev, I.A. (1999) Mechanized hardfacing of metallurgical equipment. Kiev: Ekotekhnologiya.
2. Dulnev, P.A., Kotov, P.I. (1980) Thermal fatigue of metals. Moscow: Mashinostroenie.
3. Balandin, Yu.F. (1967) Thermal fatigue of metals in ship power machine building. Leningrad: Sudostroenie.
4. Tylkin, M.A. (1971) Increase in service life of metallurgical equipment parts. Moscow: Metallurgiya.
5. Ryabtsev, I.I., Chernyak, P.F., Osin, V.V. (2004) Block-module unit for deposited metal tests. Svarshchik, 1, 18-20.
6. Senchenkov, I.K., Chervinko, O.P., Ryabtsev, I.A. (2013) Numerical modeling of stress-strain and microstructural state of hot roll during multilayer hardfacing and service. In: Mathematical problems of technical mechanics: Transact., Issue 2(22), 139-144.

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