Thermal analysis and microstructural evaluation of conventional land developed high speed tool steels

✍ Scribed by A. Shokuhfar; T. Shokuhfar

• Book ID: 102498063
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 327 KB
• Volume: 36
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.200500914

✦ Synopsis

Thermal analyses and microstructural evaluation were carried out for the conventional AISI M2 and M10 high speed steels as well as for alloys with varying Nb and/or Ti contents to assess their liquidus, solidus and other high temperature reactions. It has been found that the slope change of cooling curves marks the formation of MC type carbides, while the break is due to the crystallization of delta ferrite and much larger volume fraction of different type of carbides including M6C mostly by eutectic reactions. Results show that the formation of dendrites is the most basic characteristic of the solidification process for the AISI M2 and M10 alloys but for the steels containing niobium and/or titanium carbides, these primary carbides insert an inoculating effect and modify the coarse dendritic structure.