Abstract
Effects of cooling rate (Vcr) and final cooling temperature (Tft), after hot deformation, on microstructure and hardness for 1·0C–1·5Cr bearing steel were investigated. The results show that if Vcr increases from 2 to 25°C s−1 and Tft remains at 650°C, pearlite colony size and grain size both decrease, hardness increases. When Vcr exceeds 8°C s−1, carbide network can be restrained effectively. TEM micrographs indicate that there exist branches in the local region of lamellar cementite and ferrite, and a ferrite thin film is also found around the proeutectoid carbide. Under the cooling rate of 10°C s−1, with the increase in Tft, the microstructure changes from martensite into pearlite, carbide network becomes more serious and hardness decreases.
Get full access to this article
View all access options for this article.
