LASER SURFACE TREATMENTS - VTT

LASER SURFACE TREATMENTS Laser cladding is a process in which the cladding material is melted on the surface of a component using a high power laser beam. The molten material solidifies forming a metallurgical bond with the component. Laser cladding can be used to improve the hardness, wear resistance, corrosion resistance or temperature resistance on discrete areas of the component. Dilution with the base material is minimal and desired properties can be achieved even with thin cladding layers. Due to low energy input the thermal distortions are minimized.

Laser cladding CrNi+73%-TiC

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In laser transformation hardening moving high power laser beam is used to heat the surface of a component to the austenite phase. The surface cools down due to efficient self-quenching as the thermal energy is conducted into the surrounding material and a hard martensitic layer is formed. The laser parameters can be controlled during hardening leading to a uniform properties across the hardened area. Due to localized heating and low input energy, laser transformation hardening causes only minor thermal distortions to the component and in most cases laser hardening can be done as the last process before assembly without post-treatments.

• Laser cladding • Laser transformation hardening • Material optimization for service environment and condition • Material testing, including wear, ubrication, friction, elevated temperature and corrosion properties • Characterization of treated surfaces • Expert services Equipment • 5.0 kW Fiber laser (4.2 mm*mrad) • 6.0 kW CO2 laser • 3.0 kW Nd:YAG laser • Precitec YC50 cladding head

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Additional information Veli Kujanpää, Professor VTT Technical Research Centre of Finland P.O. Box 17021, FI-53851 Lappeenranta, Finland Tel. +358 40 576 2479 [email protected] www.vtt.fi Raimo Penttilä, Research Scientist VTT Technical Research Centre of Finland P.O. Box 17021, FI-53851 Lappeenranta, Finland Tel. +358 20 722 2887 [email protected] Ilkka Vanttaja, Senior Research Scientist VTT Technical Research Centre of Finland P.O. Box 17021, FI-53851 Lappeenranta, Finland Tel. + 358 20 722 2890 [email protected]