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Vol 13, Issue 1, 2021
Pages: 118 - 124
Professional paper
Metallic materials
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Published: 28.05.2021. Professional paper Metallic materials

EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND HARDNESS OF STEEL 67SiCr5

By
Almaida Gigović-Gekić ,
Almaida Gigović-Gekić

University of Zenica , Zenica , Bosnia and Herzegovina

Jusuf Duraković ,
Jusuf Duraković

University of Zenica , Zenica , Bosnia and Herzegovina

Hasan Avdušinović
Hasan Avdušinović

University of Zenica , Zenica , Bosnia and Herzegovina

Abstract

Steel 67SiCr5 is a alloyed carbon steel usually used for production of springs. It is used for load bearing springs, ring-shape springs, spiral springs, anti vibration springs etc. Springs steels are usually distribute in annealed or hardened and tempered state. Heat treating could be performed before or after springs forming. In this article, the results of influence of different form of heat treatment on microstructure and hardness are presented. Heat treatments like annealing (normalizing and soft annealing), hardening and tempering are carried out in atmospheric condition. From the results could be seen that in opposite of annealing the hardening treatment improves hardness of the material. Tempering process decreases hardness but it still higher than in the case of annealing. Microstructural analysis shows that temperature of heat treatment and a cooling rate had very important influence on microstructure. Also, a presence of a decarburization was noticed 

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