VERFAHREN ZUM REGELN DER MIKROSTRUKTUR EINER MITTELS LASERBESCHICHTUNG HERGESTELLTEN HARTSCHICHT

摘要

It is disclosed a method of applying a coating (12) with a controlled laser metal forming process on the surface (5) of an article (1). A light source and a signal capturing apparatus is moved over the article (1). The light source with a specific power is used to melt the surface (5) of the article (1) locally and to form a melt pool (7) to which a coating powder (8) is injected. Thereby an optical signal (13) is captured by the signal capturing apparatus from the melt pool (7), and the monitored optical signal (13) is used for the determination of temperature and temperature fluctuations as properties of the melt pool (7). Furthermore, a control system (16) with a feedback circuit is used to adjust at least one process parameter such as the power of the light source such that desired melt pool properties are obtained. Subsequently the melt pool (7) solidifies. The high degree of control over the microstructure provides an efficient tool for generating laser metal formed hard coatings (12) with optimised wear properties.