PT Journal
AU Mraz, J
   Bakalova, T
TI The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys
SO Manufacturing Technology Journal
PY 2024
BP 626
EP 635
VL 24
IS 4
DI 10.21062/mft.2024.057
DE Cobalt alloys; Cryogenic treatment; Tribological properties; Valve; Valve seats
AB This article explores the effect of cryogenic temperatures on the properties of cobalt alloys, specifically Stellite 6 and Stellite 12. These alloys are commonly used in applications that require resistance to me-chanical, thermal, and chemical wear. In this study, the focus is on the valve seats for internal combus-tion engines, which are made from cobalt alloys and undergo a freezing process before assembly into the cylinder head. The purpose of freezing is to reduce the diameter of valve seats, making them easier to fit into the cylinder head. However, the length of time spent in freezing can significantly affect the hardness and tribological characteristics of the material.
ER