Evolution of Microstructure and Properties of a Disk Cutter Ring Material during Carburization and Heat Treatment

Abstract:

This paper presents the research on the influence of carburizing and heat treatment on the properties and microstructure of a new medium carbon alloy steel Fe-0.39C-0.99Si -0.37Mn -5.06Cr-1.21Mo-0.75V (wt.%) used for disk cutter ring. The carburized case has secondary cementite besides those appeared in core such as pearlite and some carbides of Cr, Mo and V. Microstructure of the case is coarse and there are more and larger carbide particles than in core. After quenching and tempering, the carburized case and the core transformed into the microstructure comprised mostly of troostite and fully precipitated tiny carbide particles of Cr, Mo and V. The grains in the carburized case are still larger and the quantity of carbide precipitations including cementite is larger compared with that in the core. Finally, the case depth of about 1mm can be obtained; the surface hardness is above 60HRC; the core hardness is above 55HRC; and the impact toughness reaches 16.9 kJ/cm².

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1838-1841
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1838
• Online since: January 2013
• Authors: Guo Biao Lin, Zhong Jian Zhang, Mao Qing Wang, Su Min Zhu
• Keywords: Alloy Steel, Carburizing, Heat Treatment, Microstructure, Property

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