Microstructure Evolution of Laser Direct Metal Deposition of M2 High Speed Steel

Abstract:

In the current investigation, the M2 high speed steel (HSS) sample was produced by laser direct metal deposition (DMD) with a rapid manufacturing (AM) process. The overall microstructure analysed by light optical microscopy (LOM) was a gradual transition from bottom zone to top zone due to the continuous decrease of the cooling rate. The observed microstructure from SEM and XRD was consisted of a cellular or dendritic structure of ferrite, martensite, retained austenite and fine carbides. Annealing at 860 ^oC led to spheroidization of carbides. The carbides were examined by XRD to be M₆C and MC. With prolonging the annealing holding time, the more homogenous microstructure could be acquired. These studies demonstrated that annealing can improve microstructures of M2 HSS produced by DMD.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2198-2203
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2198
• Online since: November 2016
• Authors: Yi Qiao Yang, Shuang Jiang, Xiang Zhao*
• Keywords: Direct Metal Deposition, M2 High Speed Steel, Microstructure, Rapid Manufacturing

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