Eng
Ukr
Rus
Print
2017 №03 (04) DOI of Article
10.15407/as2017.03.05
2017 №03 (06)

Automatic Welding 2017 #03
Avtomaticheskaya Svarka (Automatic Welding), #3, 2017, pp. 40-43
 
Formation of nanodimensional polygonization substructure in sprayed electric arc coatings


 
 
Authors
A.N. Dubovoj, A.A. Karpechenko, M.N. Bobrov and Yu.E. Nedelko
National University of Ship Building named after Admiral Makarov 9 Geroyev Ukrainy Ave., 54025, Nikolayev, Ukraine. Е-mail: laborantmtm@gmail.com
 
Abstract
In the work the possibility of forming a thermally stable nanodimensional polygonization substructure in the sprayed electric arc coatings of Sv-08G2S and 12Kh18N10T wires was studied applying the additional deformation and pre-recrystallization heat treatment. It was shown that carrying out additional deformation of coatings allows 15–40 % increasing the duration of holding at heat treatment of up to 90–180 min without a significant deterioration in hardness due to decrease in the mobility of polygonization subboundaries. It was established that the size of the coherent scattering regions (CSR) of both deformed coatings, as well as coatings without deformation after performing the heat treatment (which provides the maximum hardness) is 1.5–3.0 times smaller than that in the state after spraying. With an increase in duration of holding the deformed coatings up to 150 min, the size of their CSR due to reduced mobility of subboundaries increases slightly, that is correlated with the slight decrease in hardness. As a result, carrying out the additional deformation by 40 and 15% and the subsequent heat treatment of the sprayed electric arc coatings of Sv-08G2S and 12Kh18N10T allows forming a thermally stable nanodimensional polygonization substructure, which provides an increased hardness as compared to the sprayed state by 75 and 54 %, respectively. 8 Ref., 1 Table, 2 Figures.
 
Keywords: deformation, polygonization substructure, pre-recrystallization heat treatment, electric arc coatings
 
Received: 05.01.17
Published: 19.04.16
 
 
References
  1. Kear, B.H. et al. (2000) Thermal sprayed nanostructured WC/Co hard coatings. J. of Thermal Spray Technology, 9, 399–406. https://doi.org/10.1361/105996300770349863
  2. Siegmann, S., Brandt, O., Drovak, D. (2004) Thermally sprayed wear resistant coatings with nanostructured hard phases. Ibid., 3, 37–43. https://doi.org/10.1007/s11666-004-0047-1
  3. Borisov, Yu.S. et al. (2010) Producing of powders for thermal spray coatings by methods of mechanic alloying and mechanochemical synthesis. Proizvodstvo, 12, 18–22.
  4. Kalita, V.I. (2005) Physics, chemistry and mechanics of formation of coatings strengthened by nanosized phases. Fizika i Khimiya Obrabotki Materialov, 4, 46–57.
  5. Dubovy, O.M. et al. (2010) Influence of prerecrystallization of heat treatment on physical-mechanical properties of sprayed coatings and wrought metals and alloys. Metaloznavstvo ta Obrobka Metaliv, 3, 7–11.
  6. Method of deposition of coatings. Pat. 88755 Ukraine. Fill. 23.09.2009. Publ. 10.11.2009.
  7. Method of deformation-thermal treatment of electric arc coatings. Pat. 10721 Ukraine. Fill. 03.11.15. Publ. 25.04.16.
  8. Gorelik, S.S., Rastorguev, L.N., Skakov, Yu.A. (1970) X-ray and electro-optical analysis. Moscow: Metallurgiya.

>