Effect of Innovative Quenching-Partitioning Heat Treatment on Microstructure and Hardness Properties of Medium Carbon Steel According to Traditional Quenching-Tempering Heat Treatment

Year 2019, Volume: 10 Issue: 1, 51 - 59, 29.07.2019

Merve Şehnaz İşyarlar , Ferhat Gül

https://doi.org/10.29048/makufebed.543897

Cited By: 1

Abstract

Ductility in the
formability of the steels is the desired material property. It is possible to
obtain the desired ductility by the traditional quenching-tempering heat
treatment which is often used in industry. However, decreasing the hardness of
steel with increasing ductility is an undesirable factor. It is aimed to obtain
a good combination of ductility and strength with the innovative
quenching-partitioning heat treatment. In this study, microstructure and
hardness properties of quenching-tempering and quenching-partitioning heat
treatments applied to steel having 0.38 carbon content were compared. Despite
the retained austenite observed in the microstructure, it was concluded that
the hardness values obtained by the quenching-partitioning heat treatment were
higher than the traditional quenching-tempering heat treatment.

Keywords

Tempering, Carbon partitioning, Retained austenite

Klasik Su Verme-Temperleme Isıl İşlemine Göre Yenilikçi Su Verme-Ayrıştırma Isıl İşleminin Orta Karbonlu Çeliğin Mikroyapı ve Sertlik Özelliklerine Etkisi

Abstract

Çeliklerin
şekillendirilebilirliği bakımından süneklik, istenen bir malzeme özelliğidir.
Sanayide sıkça kullanılan bir işlem olan klasik su verme-temperleme ısıl işlemi
ile istenilen sünekliğin elde edilmesi mümkündür. Fakat sünekliğin artmasıyla
çeliğin sertliğinin azalması istenmeyen bir etkendir. Yenilikçi su
verme-ayrıştırma ısıl işlemi ile süneklik ve mukavemetin iyi bir
kombinasyonunun elde edilmesi amaçlanmaktadır. Bu çalışmada 0,38 karbon
miktarına sahip çeliğe uygulanan su verme-temperleme ve su verme-ayrıştırma
ısıl işlemlerinin mikroyapı ve sertlik özelliklerinin karşılaştırılması
yapılmıştır. Mikroyapıda varlığı gözlemlenen kalıntı östenite rağmen su
verme-ayrıştırma ısıl işlemi ile elde edilen sertlik değerlerinin, klasik su
verme-temperleme ısıl işlemine göre yüksek olduğu sonucuna varılmıştır.

Keywords

Temperleme, Karbon ayrıştırma, Kalıntı östenit

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