2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Heat treatment process effect on carburized layer of aircraft engine heavily-loaded steel components
Pawel Rokicki1; Kamil Dychton1; Andrzej Nownotnik1; Marek Goral1; Marcin Drajewicz1; Jan Sieniawski1; Maryana Zagula-Yavorska1;1RZESZOW UNIVERSITY OF TECHNOLOGY, RESEARCH AND DEVELOPMENT LABORATORY FOR AEROSPACE MATERIALS, Rzeszow, Poland;
Type of Paper: Regular
Id Paper: 374
Topic: 17
Abstract:
Gears, due to their complex shape, carried load and required accuracy are ones of most complex aircraft engine parts. Single tooth damage usually breaks the power transmission and causes failure of the entire gear system. Adequate sustainability and guarantees of transmission is, therefore, a condition for secure operation of the whole device. Particularly high requirements for reliability are put to transmissions used in the aerospace industry. Due to the loads which are transmitted through the gears, the materials used by the manufacturer must not only have high strength but also show the abrasion resistance of the surface layer and the ductility of the core. Proper parameters matching allows to create an element that can operate at higher stresses and loads. In addition, factor strength and abrasion resistance of the surface layer has a significant impact on the life of the gear. Thermo-chemical treatment of industrial gears is a fundamental process, which gives them adequate mechanical properties regarding the loads they carry and the surface conditions of work. Among many methods of thermo-chemical treatment used in the industry, the most distinctive are innovative technologies designed to reduce process costs and being more environmentally friendly. The most promising methods in the discussed field are vacuum carburizing and high-pressure hardening, which, by their specification of work, significantly reduce the emission of CO2 and the duration of the process, without reducing the quality of the final product. The main aim of the paper is to present proper selection of heat treatment parameters and their effect on the microstructural characteristics of carburized surface layer of heavily loaded Pyrowear 53 steel gears commonly used in aircraft engine planetary gear system. Proper heat treatment parameters are crucial in programming of final material characteristics as grain size and retained austenite morphology.