RT Journal Article
SR Electronic
A1 Mráz, Jakub
A1 Bakalova, Totka
T1 The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys
JF Manufacturing Technology Journal
YR 2024
VO 24
IS 4
SP 626
OP 635
DO 10.21062/mft.2024.057
UL https://journalmt.com/artkey/mft-202404-0001.php
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.