Ocena jakości warstw nakładanych metodą laserowego osadzania metalu w proszku LDT
Journal Title: Autobusy. Technika, Eksploatacja, Systemy Transportowe - Year 2018, Vol 220, Issue 6
Abstract
The article presents the results of a study of C45 carbon steel hardfacing using laser metal deposition with Stellit Co-21 powder. The microstructure of the cross-section of samples prepared with different scanning speed and the amount of used powder at constant laser power was observed. Analyzing the cross-sectional areas of the samples, it was found that, at specific production parameters, cracks occur in weld overlay, which should be associated with the amount of heat supplied and discharged, especially at the unheated basis.This may be confirmed by the presence of deposits of weakly branched dendrites in the microstructure, which should be related to the directional heat dissipation process and rapid directional crystallization. It is possible to regulate these phenomena by selecting appropriate processing parameters. The microstructure analysis of cross-sectional areas of samples after hardfacing using LDT technique indicates good metallurgical quality of the deposit with a small heat affected zone of about 660÷760mm. The microhardness measurements on the sample cross-sections indicated a wide micohardness distribution ranging from 510HV1 in the weld overlay, about 410HV1 in the heat affected zone, to 270HV1 in the C45 steel base.
Authors and Affiliations
Andrzej Mazurkiewicz
Keywords
Related Articles
- EP ID EP561834
- DOI 10.24136/atest.2018.140
- Views 50
- Downloads 0
Nowe uwarunkowania funkcjonowania transportu drogowego w Europie
In the European economic space there have been a number of activities that significantly affect the ability to undertake the transportation tasks by companies from other countries. These activities not only aim to change...
Nowa definicja Trolejbusu w Prawie o Ruchu Drogowym
22 czerwca bieżącego roku weszła w życie kolejna, 104 już, zmiana ustawy Prawo o Ruchu Drogowym. Wśród wielu kwestii poruszanych w nowym akcie prawnym, znalazły się również nowe definicje dotyczące tramwaju i trolejbusu....
Ochrona infrastruktury krytycznej. Uregulowania prawne
The content outline: in accordance with law, the Polish critical infrastructure constitutes 11 sectors, vital for national security and public safety persistence. Two of the sectors (energy sector and transportation syst...
Effect of emission measurement of toxic exhaust components of automotive vehicles equipped with spark-ignition engines on the environment during mandatory check tests at vehicle inspection stations
The article describes aspects related to the impact of toxic components of exhaust gases from motor vehicles, which are equipped with spark-ignition engines for environmental pollution and a negative impact on human heal...
Analiza kosztów utrzymania floty transportowej na przykładzie miejskiego zakładu komunikacji
The article concerns the costs related to maintaining the transport fleet in a public transport system. It presents the theoretical basis for urban transport, the costs that appear in the context of the transport fleet,...