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National Research Nuclear University “MEPhI”
ArticleName Surface hardening of construction materials by method of laser cladding of heat-resistant nickel alloys
DOI 10.17580/tsm.2015.03.07
ArticleAuthor Polskiy V. I., Yakushin V. L., Dzhumaev P. S., Petrovskiy V. N.

Chair “Physical Problems of Materials Science”, National Research Nuclear University “MEPhI”, Moscow, Russia:

V. I. Polskiy, Assistant Professor, e-mail:

V. L. Yakushin, Professor

P. S. Dzhumaev, Assistant


Chair “Laser physics”, National Research Nuclear University “MEPhI”, Moscow, Russia:

V. N. Petrovskiy, Assistant Professor


A large number of machinery components fails during operation due to various factors, such as: abrasive wear, impact loading, erosion, etc. Modern technology has different methods of hardening and recovery of parts for their lifetime increasing. One of the promising methods of restoration and strengthening is laser cladding — applying a metallic material layer on the surface by laser melting of powder, wire, etc, supplied to the laser irradiation zone. Laser surface cladding technique of cylindrical and flat samples, made of various structural steels, was developed. Heat resistant complex nickel-based alloy powder was used as cladding material. Laser cladding process was carried out on the “Scanner” and “Huffman HC-205” laser facilities. There were investigated the changes of microstructure and microhardness of laser processed samples, depending on laser radiation specific power and different methods of Ni-alloy powder application on sample surface. As a result, there were revealed the optimal technological regimes of laser processing, which lead to formation of clad layer with homogeneous microstructure. In comparison with initial material, this layer has the 2 times increased value of microhardness. Clad layer adhesion improves with increase of laser radiation specific power and reaches the optimum value at P = 800 W for “Huffman HC-205” and P = 1100 W for “Scanner” instal lation.The studies established the optimal modes of application of laser weld overlays on substrates of various sizes and configurations, which minimize the heat affected zone sizes and variations of hardness values, reducing the probability of occurrence of cracks and discontinuities.

keywords Surface hardening, laser, construction material, heat-resistant nickel alloy, laser cladding, microstructure, surface modification, surface hardening

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