Metallurgy, Vol. 51 No. 1, 2012.
Original scientific paper
Microstructural evolution of a cold work tool steel after pulsed laser remelting
M. Pleterski
; Faculty of Mechanical Engineering, Ljubljana, Slovenia
T. Muhič
; TKC d.o.o., Ljubljana, Slovenia
D. Klobčar
; Faculty of Mechanical Engineering, Ljubljana, Slovenia
L. Kosec
; Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
Abstract
The aim of this study is the investigation of micro-structural behaviour of a Mat. No. 1.2379 (EN-X160CrMoV121; AISI D2) cold work tool steel after remelting with a precise pulsed Nd:YAG laser. The investigated steel is one of the most hard to weld tool steels, due to large amount of alloying elements. The analysis was done on single spots remelted with specific laser pulse shape and parameters, assuring crack-less solidification. Re-solidifi ed areas were investigated with microscopy, hardness measurements, X-ray spectroscopy and diffraction method. Laser treatment causes rapid solidification leading into a formation of a fine dendritic microstructures containing high amount of retained austenite causing a significant decrease of hardness.
Keywords
laser; welding; microstructure; tool steel
Hrčak ID:
71163
URI
Publication date:
2.1.2012.
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