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
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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
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