Laser Melt Injection of Austenite Cast Iron ChN16D7GKh with Titanium
https://doi.org/10.17073/1997-308X-2015-3-44-52
Abstract
The results of studying the microstructure and microhardness of Ni-resist cast iron ChN16D7GKh after laser melt injection by means of introducing titanium into the melt are presented. The treatment was performed using a fiber laser with a beam focused into a spot 0,2 mm in diameter with the radiation power of 1 kW and motion velocity of the laser beam of 10–40 mm/s. Titanium is dissolved in the cast-iron melt, and TiC particles are formed in the structure in he course of cooling. The coefficient of using the titanium powder increases as the size of the fusion zone increases and reaches 50 % in the best case. A modified layer has a composite structure with a metallic matrix and comparatively uniform distribution of titanium carbide particles. Microhardness of the modified zone is 600–700 HV. Its further growth is suppressed by the partial removal of carbon from the melt zone in the composition of red fume isolated in the process course. Therefore, the Laves phase (TiFe2) is formed instead of increasing the TiC content upon increasing the titanium supply. The experimental data on the regularities of the weight loss of the samples caused by substance removal from the melt zone depending on laser fusion parameters are presented.
About the Authors
V. G. Gilev
Пермский национальный исследовательский политехнический университет (ПНИПУ)
Russian Federation
Russian Federation
E. A. Morozov
Пермский национальный исследовательский политехнический университет (ПНИПУ)
Russian Federation
Russian Federation
References
1. Takuto Yamaguchi, Hideki Hagino, Mamoru Takemura, Yasunori Hasegawa, Yasuhiro Michiyama, Atsushi Nakahira. Microstructure of Fe—TiC Composite Surface Layer on Carbon Steel Formed by Laser Alloying Process. Mater. Trans. 2013. Vol. 54. No. 9. P. 1755—1759.
2. Turichin G.A., Zemlyakov E.V., Pozdeeva E.Yu. Technological possibilities of laser cladding with the help of powerful fiber lasers. Metal Science and Heat Treatment. 2012. Vol. 54. No. 3-4. July.
3. Gilev V.G., Bezmaternykh N.V., Morozov E.A. Study of steel—copper pseudo alloy microstructure and microhardness after laser heat treatment. Metal Science and Heat Treatment. 2014. Vol. 56. No. 5-6. September.
4. Gilev V.G., Morozov E.A. Rusin E.S., Khanov A.M. Lazernaya termicheskaya obrabotka kol’tsevykh vystupov iz poroshkovoi medistoi stali (psevdosplava stal’—med’) [Laser hardening of annular ledges made from powder copper-bearing steel (pseudo-alloy steel—copper)]. Izv. Vuzov. Poroshk. Metallurgiya i Funkts. Pokrytiya. 2014. No. 2. P. 36—42.
5. Jiang W.H., Kovacevic R. Laser deposited TiC/H13 tool steel composite coatings and their erosion resistance. J. Mater. Processing Technol. 2007. Vol. 186. P. 331—338.
6. Gilev V.G., Morozov E.A., Denisova A.S., Khanov A.M. Issledovanie mikrostruktury i rel’efa poverkhnosti pri lazernoi termicheskoi obrabotke tonkostennogo tsilindra iz poroshkovogo psevdosplava stal’-med’ [Research of microstructure and surface relief at laser thermal processing of the thin-walled cylinder made from powder pseudo-alloy steelcopper]. Izvestiya Samarskogo nauchnogo tsentra RAN. 2012. Vol. 14. No. 4(5). P. 1212—1217.
7. Safonov A.N. Izuchenie struktury i tverdosti poverkhnosti zhelezouglerodistykh splavov posle ikh oplavleniya lazernym izlucheniem [The study of the structure and surface hardness of iron-carbon alloys after melting by laser radiation]. Metallovedenie i termicheskaya obrabotka metallov. 1999. No.1. P.7—10.
8. Gilev V.G., Morozov E.A., Purtov I.B., Rusin E.S. Issledovanie mikrostruktury i mikrotverdosti zon lazernogo oplavleniya chuguna nirezist ChN16D7GKh [Microstructure and microhardness research of Nirezist cast iron after laser surface melting]. Izvestiya Samarskogo nauchnogo tsentra RAN. 2014. No. 6. P. 227—233.
9. Deus A.M. A Thermal and Mechanical Model of Laser Cladding. In: Mechanical Engineering. Urbana-Champaign: University of Illinois at Urbana-Champaign, 2004.
10. Verezub O., Kálazi Z., Buza G., Verezub N.V., Kaptay G. Insitu synthesis of a carbide reinforced steel matrix surface nanocomposite by laser melt injection technology and subsequent eat treatment. Surf. Coat. Technol. 2009. Vol. 203. P. 3049—3057.
11. Do Nascimento A.M., Ocelí k V., Ierardi M.C.F., De Hosson J.Th.M. Microstructure of reaction zone in WCp/duplex stainless steels matrix composites processing by laser melt injection. Surf. Coat. Technol. 2008. Vol. 202. P. 2113–2120.
12. Verezub O.N., Kálazi Z., Buza G., Boross P., Vero B, Kaptay G. Surface metal matrix composite Fe—Ti—C/TiC layers produced by laser melt injection technology. In: Int. Conf. «Advanced metallic materials» (Smolenice, Slovakia, 5—7 November 2003). P. 297—300.
13. Stavrev D., Dikova Ts. Behaviour of graphite in laser surface hardening of irons. Machines, technologies, materials.2007. No. 4 P. 98—101. URL: http://www.mech-ing.com/journal/Archive/4-5-2007/3.Materiali/3.2_journal-statia-DimitarStavrev-070920.pdf
14. Yanbin Chen, Dejian Liu, Fuquan Li, Liqun Li. WCp/Ti—6Al—4V graded metal matrix composites layer produced by laser melt injection. Surf. Coat. Technol. 2008. Vol. 202. P. 4780—4787.
15. Kraposhin V.S. Vliyanie ostatochnogo austenita na svoistva stalei i chugunov posle poverkhnostnogo oplavleniya [Effect of retained austenite on the properties of steels and irons after surface melting]. Metallovedenie i termicheskaya obrabotka metallov. 1994. No. 2. P. 2—5.
16. Kraposhin V.S., Shakhlevich K.V., Vyaz’mina T.M. Influence of laser heating on the quantity residual austenite in steels and cast irons. Metal Science and Heat Treatment. 90.
17. Vol. 31. No. 9-10. P. 745—757.
Review
For citations:
Gilev V.G., Morozov E.A. Laser Melt Injection of Austenite Cast Iron ChN16D7GKh with Titanium. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2015;(3):44-52. (In Russ.) https://doi.org/10.17073/1997-308X-2015-3-44-52
Views:
1224
Email this article 