Naslov
Influence of two different heat treatment procedures on mechanical and fracture properties of 65Si7 steel

Autori
Pustaić, Dragan ; Cajner, Franjo

Izvornik
Inžynieria Materialowa (0208-6247) 22 (2001), 5; 733-736

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Heat treatment; Steel 65Si7; Mechanical properties; Fracture mechanics parameters

Sažetak
This paper deals with the results of investigations of two different heat treatment procedures and their influence on some mechanical properties as well as on the magnitude of some fracture mechanics parameters for a particular type of steel. Experimental investigations were performed on the specimens made of 65 Si 7 steel. The processes occurring by tempering of two different microstructures of the steel, i. e. martensite and lower bainite, and their influence on some mechanical properties and on fracture toughness of the material were investigated. An advantage of austempering over hardening and tempering is in obtaining the bainite microstructure. Steel of bainite microstructure has a greater toughness, ductility, contraction, fatigue strength and a better fracture toughness than a tempered martensite of the same type of steel. A bainite microstructure also gives a better resistance to thermal fatigue in comparison with martensite microstructure. The above mentioned improved values of mechanical properties refer to the untempered state of bainite.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA