The evaluation of nodular iron surface layer modification by laser alloying with nitrogen and titanium
[ 1 ] Instytut Maszyn Roboczych i Pojazdów Samochodowych, Wydział Maszyn Roboczych i Transportu, Politechnika Poznańska | [ P ] employee
PL Ocena możliwości modyfikacji warstwy wierzchniej elementów z żeliwa sferojdalnego za pomocą azotytonowania laserowego
2013
scientific article
english
- nitrogen and titanium laser alloying
- surface layer
- nodular iron
- azototytanowanie laserowe
- warstwa wierzchnia
- żeliwo sferoidalne
EN The following article refers to the surface layer cast iron parts modification by laser treatment. The aim of this research was analysis of nitrogen and titanium laser alloying influence on microstructure and microhardness of treating surface layer. As a source of nitrogen, Si3 N4 was used. This research showed that it is possible to enrich the cast iron surface layer with nitrogen and titanium by laser treatment. Fine-grained microstructure of remelted zone consists of α solid state and cementite. Nitrogen and titanium were found in remelted zone. The research showed that alloying elements are present in solid states, mostly. However, nitrogen could be present in Fe24N10 iron nitride as well. It was showed that microhardness could be increased about 4 times (depending on laser treatment parameters) comparing to the base material. This higher microhardness could be present in as little as 1 mm depth from the surface. The possibility of laser alloying with nitrogen and titanium was confirmed by laser treatment test of nodular iron camshaft.
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