Кафедра "Ливарне виробництво"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/3124

Офіційний сайт кафедри http://web.kpi.kharkov.ua/lv

Кафедра "Ливарне виробництво" створена у 1927-1928 роках на базі ливарної лабораторії, що існувала в технологічному інституті ще з 1924 року.

Першим завідувачем кафедри став професор Євген Євгенович Фарафонов. Перший випуск спеціалістів-ливарників у кількості 5 осіб, переведених з інших спеціальностей, відбувся у 1928 році.

Кафедра входить до складу Навчально-наукового інституту механічної інженерії і транспорту Національного технічного університету "Харківський політехнічний інститут".

У складі науково-педагогічного колективу кафедри працюють: 4 доктора технічних наук, 1 кандидат технічних наук, 1 доктор філософії; 4 співробітника мають звання професора.

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Фільтри

2016 - 20172

Налаштування

Автор: search.filters.author.Kostyk, KaterynaКлючові слова: search.filters.subject.combined treatment

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  • Ескіз
    Документ
    Development of innovative method of steel surface hardening by a combined chemical-thermal treatment
    (Scientific Route, Estonia, 2016) Kostyk, Kateryna
    The aim of the article is a hardening of the surface steel layers due to the combination treatment. Samples of steel 38Cr2MoAl were hardened by complex chemical and thermal treatment such as carburizing and subsequent boriding. It was established that surface double-layer hardening for steel 38Cr2MoAl with sequential saturation with atomic carbon (during carburizing) and atomic boron (during furnace boriding) at different temperatures allowed to form a boride layer with transition zone. The obtaining transition zone can improve operational properties of machine parts and tools by micro-friability reduction of diffusion layer. An optimal mode of complex chemical-thermal treatment (CTT) was obtained for the regime, which includes carburizing at 950 °C for 2 hours, boriding at 950 °C for 2 hours, which allows to get the best value for the surface hardness of 22 GPa with a maximum overall diffusion layer 1.4 mm. Due to the technology of combined treatment we can significantly reduce treatment time compared to traditional hardening means and significantly improve product performance properties due to the transition zone between the borides and the matrix of machine elements. The technology can be used in enterprises where there is any hardening furnace without additional installation or conversion of equipment.
  • Ескіз
    Документ
    Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl
    (Технологический центр, 2017) Idan, Alaa Fadhil І; Akimov, Oleg; Kostyk, Kateryna
    Development of new combined strengthening technologies for treatment of steel surface layer is a topical issue. Influence of conditions of combined hardening treatment on variation of properties of the surface layer of 38Cr2MoAl steel was studied. Experimental data have shown that thickness of the hardened layer of 38Cr2MoAl steel, depending on the process conditions of combined treatment, varied in the range 0.18 to 0.69 mm with the surface hardness being 10.5-12.5 GPa. Mathematical models of the hardened layer thickness and surface hardness were obtained depending on variation of velocity of the laser beam travel and duration of nitriding of steel following the combined treatment. In their structure, the models are regression equations. These regularities have practical technological significance and ensure prediction of values of the hardened layer thickness and surface hardness. Nomograms of simultaneous influence of velocity of the laser beam travel and duration of nitriding on thickness of the hardened steel layer and surface hardness were constructed. Nomograms make it possible to determine concrete conditions of hardening processing, starting from specified thickness of the hardened layer or the surface hardness of 38Cr2MoAl steel, respectively and also to solve inverse problems. This method is suitable for hardening hard-to-reach part sectios and local contact areas.