The Influence of Cryogenic Treatment on Mechanical Properties and Microstructures of Vanadis 8 Steel

Abstract

Due to its high mechanical properties, Vanadis 8 cold work tool steel is used to cutting and forming applications in industry. In this study; Vanadis 8 cold work tool steel was subjected to cryogenic treatment and conventional heat treatment, and the effects of these samples on mechanical properties and microstructure were investigated. The samples were cooled by cryogenic treatment at a constant rate of 2°C/min from room temperature to -140°C and kept at this temperature for 24 hours. The hardness values ​​of the samples were measured in Rockwell under 200 g load with a 10 second application time. Compression test was carried out on a tensile tester with a loading capacity of 100 kN at a constant delivery speed of 1 mm/min. The microstructures of the samples were evaluated by obtaining SEM images. When the experimental results were examined, hardness and the compressive strength values of the cryogenic sample were increased. After cryogenic treatment, martensite phase, residual austenite phase, vanadium and chromium based carbides were determined in microstructure.

Keywords

• Cryogenic Treatment,Cold Work Tool Steels,Mechanical Properties,Microstructure,Vanadis 8.

Kriyojenik İşlemin Vanadis 8 Çeliğinin Mekanik Özellikleri ve Mikroyapısı Üzerindeki Etkisi

Öz

Vanadis 8 soğuk iş takım çeliği endüstride yüksek mekanik özellikleri nedeni ile kesme ve form verme işlemlerindeki uygulamalarda karşımıza çıkmaktadır. Bu çalışmada; Vanadis 8 soğuk iş takım çeliğine kriyojenik işlem ve geleneksel ısıl işlem uygulanmış olup, bu numunelerin mekanik özellikleri ve mikroyapı üzerindeki etkileri incelenmiştir. Numuneler kriyojenik işlem ile 2°C/dk sabit hızla oda sıcaklığından -196°C’ye soğutulmuş ve bu sıcaklıkta 24 saat boyunca bekletilmiştir. Numunelerin sertlik değerleri Rockwell cinsinden 200 gr yükün altında 10 sn uygulama süresi ile ölçülmüştür. Basma deneyi 100 kN yükleme kapasiteli çekme test cihazında sabit 1 mm/dk basma hızında gerçekleştirilmiştir. Numunelere ait mikroyapılar SEM görüntüleri elde edilerek değerlendirilmiştir. Deneysel sonuçlar incelendiğinde, kriyojenik işlem uygulanan numunenin sertlik ve basma dayanımı değerlerinde artış gözlenmiştir. Kriyojenik işlem sonrası mikroyapıda martenzit fazı, kalıntı östenit fazı, vanadyum ve krom esaslı karbürler belirlenmiştir.

Anahtar Kelimeler

• Vanadis 8,Kriyojenik İşlem,Soğuk İş Takım Çelikleri,Mekanik Özellikler,Mikroyapı

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