Structure and hardness of wear-resistant coatings with low-frequency current modulation deposited on low carbon steel
https://doi.org/10.17073/0368-0797-2020-6-469-473
Abstract
Influence of the modes of manual electric arc surfacing of coatings with T-590 electrodes on low-alloy steel 09G2S on their structure and hardness was investigated. It is shown that the pulsed arc surfacing of coatings by electrodes forms a fine-dendritic structure of the deposited metal. Microstructure of the heat-affected zone after surfacing consists of several sections: the overheating zone with a widmanstett structure and the normalization zone with a characteristic fine-grained ferrite-perlite structure. In the initial state, the base metal (steel 09G2S) has a hardness of ~2500 MPa. The hardness of the deposited coating material due to strong mixing with the steel metal is ~ 2700 – 3000 MPa, and of thermal impact zone: 2100 – 2300 MPa. When applying the coating on DC mode, heating temperature of the surfacing bath is higher; this, as a consequence, causes grain growth. When coating on pulse modes, a structure with smaller component sizes is formed by directed low-frequency high-energy impact of the electric arc on the formed metal and due to the constant reciprocating motion of the melt with the frequency of current modulation. It was established that the application of the pulse-arc surfacing method allows preserving the previously formed hardening phases in the deposited coatings.
Keywords
Supporting agencies: The work was performed as part of the Basic S tific Research Programs of the State Academies of Sciences for 2018–2020, project III.23.2.1.
About the Authors
Yu. N. Saraev
Institute of Strength Physics and Materials Science SB RAS
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Chief Researcher of the Laboratory of Composite Materials
Tomsk
V. P. Bezborodov
Institute of Strength Physics and Materials Science SB RAS
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior Researcher of the Laboratory of Composite Materials
Tomsk
M. V. Perovskaya
Institute of Strength Physics and Materials Science SB RAS
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Research Associate of the Laboratory of Composite Materials
Tomsk
V. M. Semenchuk
Institute of Strength Physics and Materials Science SB RAS
Russian Federation
Russian Federation
Engineer of the Laboratory of Composite Materials
Tomsk
References
1. Cantor B., Chang I.T.H., Knight P., Vincent A.J.B. Microstructural development in equiatomic multicomponent alloys. Materials Science and Engineering: A. 2004, vol. 375-377, no. 1, pp. 213-218.
2. Zhou Y.J., Zhang Y., Wang F.J., Wang Y.L., Chen G.L. Effect of Cu addition on the microstructure and mechanical properties of AlCoCrFeNiTi0.5 solid-solution alloy. Journal of Alloys and Compounds. 2008, vol. 466, no. 1-2, pp. 201–204.
3. Guo Sheng, Chun Ng, Jian Lu, Liu C. T. Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys. Journal of Applied Physics. 2011, vol. 109, no. 10, article 103505.
4. Guo Sheng, Liu C. T. Phase stability in high entropy alloys: Formation of solid-solution phase or amorphous phase. Progress in Science: Materials International. 2011, vol. 21, no. 6, pp. 433–446.
5. Yeh Jien-Wei, Chang Shou-Yi, Hong Yu-Der, Chen Swe-Kai, Lin Su-Jien. Anomalous decrease in X-ray diffraction intensities of Cu–Ni–Al–Co–Cr–Fe–Si alloy systems with multi-principal elements. Materials Chemistry and Physics. 2007, vol. 103, no. 1, pp. 41-46.
6. Mahlalela S.S., Pistorius P.G.H. Microstructural characterization of laser beam and gas tungsten arc welded zirconium-2.5Nb. Journal of the Southern African Institute of Mining and Metallurgy. 2017, vol. 117, no. 10, pp. 947–953.
7. Gao X.-L., Liu J., Zhang L.-J., Zhang J.-X. Effect of the overlapping factor on the microstructure and mechanical properties of pulsed Nd: YAG laser welded Ti6Al4V sheets. Materials Characterization. 2014, vol. 93, pp. 136–149.
8. Ram V., Kohn G., Stern A. CO 2 laser beam weldability of Zircaloy-2. Welding Journal. 1986, vol. 65, no. 7, pp. 33–38.
9. Wan Q., Bai X., Zhang X. Impact of high dose krypton ion irradiation on corrosion behavior of laser beam welded Zircaloy-4. Materials Research Bulletin. 2006, vol. 41, no. 2, pp. 387–395.
10. Song K.-N., Kim S.-S., Lee S.-H., Lee S.-B. Laser welding unit for intersection line welding of spacer grid inner straps and its application. Journal of Laser Micro/Nanoengineering. 2009, vol. 4, no. 1, pp. 11–17.
11. Song K.-N., Lee S.-H. Effect of weld properties on the crush strength of the PWR spacer grid. Science and Technology of Nuclear Installations. 2012, vol. 2012, Spec. issue, аrticle 540285.
12. Jeong D.H., Kim J.H. Fatigue characteristics of laser welded Zircaloy thin sheet. Int. J. Mod. Phys.: Conference Series. 2012, vol. 6, pp. 367–372.
13. Han Q., Kim D., Kim D., Lee H., Kim N. Laser pulsed welding in thin sheets of Zircaloy-4. J. Mater. Process. Technol. 2012, vol. 212, pp. 1116–1122.
14. Kim S., Lee W., Kim D. One-step distortion simulation of pulsed laser welding with multi-physics information. Int. Journal of Simulation Modelling. 2015, vol. 1, pp. 85–97.
15. Cai C., Tao W., Li L., Chen Y. Weld bead formation and corrosion behavior of pulsed laser welded zirconium alloy. Int. Journal of Advanced Manufacturing Technology. 2015, vol. 77, pp. 621–628.
16. Cai C., Li L., Tao W., Peng G., Wang X. Weld bead size, microstructure and corrosion behavior of zirconium alloys joints welded by pulsed laser spot welding. Journal of Materials Engineering and Performance. 2016, vol. 25, pp. 3783–3792.
17. Saraev Yu.N., Bezborodov V.P., Grigoryeva A.A., Golikov N.I., Dmitriev V.V., Sannikov I.I. Distribution of residual stresses in welded joints in 09G2S steel produced by adaptive pulsed-arc welding. Welding International. 2015, vol. 29, no. 2, pp. 131–134.
18. Saraev Yu.N., Bezborodov V.P. Effect of the energy parameters of the welding process on the structure and properties of welded joints in low-alloy steels. Welding International. 2013, vol. 27, no. 9, pp. 678–680.
19. Bezborodov V.P., Saraev Y.N. Use of coatings for protection of welded joints of steels, their structure and properties. Journal of Physics: Conference Series. 2017, vol. 857, no. 1, article 012005.
20. Bezborodov V.P., Saraev Yu.N. Microstructure and mechanical properties of eutectic nickel alloy coatings. IOP Conference Series: Materials Science and Engineering. Ser. “International Conference on Mechanical Engineering, Automation and Control Systems. 2016, vol. 124, article 012119.
Review
For citations:
Saraev Yu.N., Bezborodov V.P., Perovskaya M.V., Semenchuk V.M. Structure and hardness of wear-resistant coatings with low-frequency current modulation deposited on low carbon steel. Izvestiya. Ferrous Metallurgy. 2020;63(6):469-473. (In Russ.) https://doi.org/10.17073/0368-0797-2020-6-469-473
Views:
666
Email this article 