powderИзвестия вузов. Порошковая металлургия и функциональные покрытияPowder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)1997-308X2412-8767НИТУ "МИСИС"10.17073/1997-308X-2015-3-44-52powder-139Research ArticleМодифицирование поверхности, в том числе пучками заряженных частиц, потоками фотонов и плазмыModification of Surface Including Charged Particle Beams and Photon and Plasma FluxesЛазерное инжекционное легирование аустенитного чугуна ЧН16Д7ГХ титаномLaser Melt Injection of Austenite Cast Iron ChN16D7GKh with TitaniumГилевВ. Г.GilevV. G.

канд. техн. наук, ст. науч. сотрудник Научного центра порошкового материаловедения ПНИПУ (614013, г. Пермь, ул. Проф. Поздеева, 6).

Xray@pm.pstu.ac.ruМорозовЕ. А.MorozovE. A.

аспирант кафедры «Материалы, технологии и конструирование машин», руководитель лаборатории лазерной наплавки ПНИПУ

morozov.laser@gmail.comПермский национальный исследовательский политехнический университет (ПНИПУ)Russian Federation201514092015034452Copyright © НИТУ "МИСИС", 20152015НИТУ "МИСИС"НИТУ "МИСИС"https://powder.misis.ru/jour/about/submissions#copyrightNoticehttps://powder.misis.ru/jour/article/view/139

Приведены результаты исследования микроструктуры и микротвердости чугуна (нирезиста) ЧН16Д7ГХ после лазерного легирования путем внедрения частиц титана в расплав. Обработку осуществляли с использованием волоконного лазера с пучком, сфокусированным в пятно диаметром 0,2 мм, при мощности излучения 1 кВт и скорости движения лазерного луча 10–40 мм / с. Титан растворяется в расплаве чугуна, и при охлаждении в структуре образуются частицы TiC. Коэффициент использования порошка титана возрастает при увеличении размеров зоны оплавления и достигает в лучшем случае величины 50 %. Модифицированный слой имеет композитную структуру с металлической матрицей и сравнительно равномерным распределением частиц карбида титана. Микротвердость модифицированной зоны составляет 600–700 HV. Дальнейшему ее росту препятствует тот факт, что часть углерода в ходе лазерного плавления удаляется из зоны расплава в составе выделяемого в процессе бурого дыма. Поэтому при увеличении подачи титана вместо повышения содержания TiC формируется фаза Лавеса (TiFe2). Приведены экспериментальные данные о закономерностях потери массы образцов, вызванной удалением вещества из зоны расплава, в зависимости от параметров лазерного оплавления.

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.

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The authors declare that there are no conflicts of interest present.