Tribological properties of sulfur-containing high-speed steels at elevated temperature

• Published in: Transactions of Nonferrous Metals Society of China Vol. 23; no. 6; pp. 1674 - 1680
• Main Authors: LIU, Ru-tie, XIONG, Xiang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2013
• Subjects: Alloys; elevated temperature; Friction; High speed tool steels; high-speed steel; Powder metallurgy; sliding friction; Softening; steel bonded carbide; Sulfur; Tribology; wear; X-ray photoelectron spectroscopy; wear; sulfur; elevated temperature; steel bonded carbide; sliding friction; high-speed steel
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(13)62647-3

Tribological properties of ferrous-based alloys can be effectively improved by introducing an appropriate amount of elemental sulfur into the alloys. A few samples of sulfur-containing high-speed steels were prepared by powder metallurgy techniques. High temperature friction properties of the samples mating with different counter materials, i.e., self-dual and GT35 steel bonded carbide were studied on a pin-on-disk tribo-meter. Worn surfaces were analyzed using SEM, EDS and XPS, and the friction mechanism was discussed. It is found that for both cases of self-dual and GT35 counter mates, the friction factors gradually decrease and the wear rates increase with rising the temperature. The friction coefficient curves become more stable at 400 °C and 700 °C than at room temperature, and the better friction performance is observed for the GT35. Below 400 °C, friction coefficients drop with rising the temperature, due to sulfide softening. Above 400 °C, friction coefficients drop mainly due to the formation of oxides on the worn surfaces.