Yaşlandırılmış PH 13-8 Mo Çeliğinin İşlenmesinde Sertlik ve Kesme Parametrelerinin Etkileri

Abstract

Bu çalışmada, çökelme sertleşmesi uygulanabilir martenzitik çeliklerden Corrax malzemesinin farklı ısıl işlemler sonrası oluşan mikroyapı ve sertlik değerleri incelenmiş ve işlenebilirlik performansı kuru ve kaplamasız takım kullanılarak yapılan tornalama deneyleri ile değerlendirilmiştir. Corrax malzemesi uygulanan farklı sıcaklıktaki ısıl işlemlere göre sertlik değeri 50 HRC değerine kadar çıkmış, bu sıcaklıktan daha yüksek sıcaklıkta ise (600℃) yapılan yaşlandırma işlemi ile sertlik değerlerinde aşırı yaşlandırmaya bağlı düşüş görülmüştür. İşlenebilirlik testlerinde ise, en yüksek kesme kuvveti değeri A6 numunesinde elde edilmiştir ve bu durum yaşlandırma esnasında meydana gelen dönüşmüş östenit ile ilişkilendirilmiştir. En düşük kesme kuvveti değerleri genel olarak A0 numunesinde elde edilirken, en yüksek kesme kuvveti A6 numunesinde ölçülmüştür. En düşük yüzey pürüzlülük değerleri ise genel olarak A6 numunesinde ölçülmüştür. Genel olarak yaşlandırma işlemleri kesme kuvvetlerinin artmasına neden olurken, çalışmanın en dikkat çekici sonucu en yüksek kesme kuvvetinin, en sert malzeme yerine A6 numunesinde ölçülmüş olmasıdır ve bu durum kalıntı östenitin, işleme esnasında oluşan deformasyon ile martenzite dönüşmesi ile ilişkilendirilmiştir.

Keywords

• Corrax
• PH 13 8 Mo
• Isıl işlem
• İşlenebilirlik

Effect of Hardness and Cutting Parameters on Machining of Aged PH 13-8 Mo Steel

Abstract

In this study, the effects of different heat treatment conditions on the microstructure, hardness, and machinability performance of precipitation-hardenable martensitic Corrax steel were investigated. Following various heat treatments, microstructural evolution and hardness variations were examined, while machinability performance was evaluated through dry turning experiments conducted with uncoated cutting tools. The results revealed that the hardness of the Corrax material increased up to 50 HRC depending on the applied heat treatment temperature; however, when aged at higher temperatures (600 °C), a decrease in hardness occurred due to over-aging. In the machinability tests, the highest cutting force was observed in the A6 specimen, which was attributed to the formation of reverted austenite during the aging process. Conversely, the lowest cutting force values were generally obtained in the A0 specimen. The lowest surface roughness values were also predominantly measured in the A6 specimen. Overall, the aging treatments led to an increase in cutting forces. The most remarkable finding of the study was that the maximum cutting force was not recorded in the hardest specimen but in the A6 condition, a phenomenon associated with the transformation of retained austenite into martensite under machining-induced deformation.

Keywords

• Corrax
• PH 13-8 Mo
• heat treatment
• machining

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