Kriyojenik İşlemin Vanadis 8 Çeliğinin Mekanik Özellikleri ve Mikroyapısı Üzerindeki Etkisi

Yıl 2020, Cilt: 2 Sayı: 1, 22 - 32, 15.07.2020

Dilşad Akgümüş Gök Vedat Öztürk

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

Destekleyen Kurum

İSTANBUL Aydın Üniversitesi

Proje Numarası

54167746-050.03.04-2018/05

Teşekkür

Araştırmacılar, bu çalışmanın 54167746-050.03.04-2018/05 numaralı BAP projesi olarak gerçekleştirilmesini sağlayan İstanbul Aydın Üniversitesi’ne teşekkürlerini sunmaktadır.

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

Öz

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.

Anahtar Kelimeler

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

Proje Numarası

54167746-050.03.04-2018/05

Kaynakça

• Amini, K., Akhbarizadeh A. and Javadpour S., (2014). Investigating the Effect of Quench Environment and Deep Cryogenic Treatment on the Wear Behavior of AZ91, Materials & Design, 54, 154-160.
• Akhbarizadeh, A., Shafyei A. and Golozar, M.A., (2009). Effects of Cryogenic Treatment on Wear Behavior of D6 Tool Steel, Materials & Design, 30, 3259–3264.
• Arslan, F., Altinsoy, D. and Hatman, A., (2011). Characterization of Cryogenic Heat Treated Vanadis 4 PM Cold Work Tool Steel, Vacuum, 370-373.
• Arslan, Y., (2014). Kriyojenik İşlemin AISI D3 Soğuk İş Takım Çeliğinin Performansına Etkilerinin İncelenmesi, Doktora Tezi, Gazi Üniversitesi, Makine Eğitimi Anabilim Dalı, Ankara.
• Bensely, A., Senthilkumar, D. and Mohan Lal, D., (2007). Effect of Cryogenic Treatment on Tensile Behavior of Case Carburized Steel-815M17, Materials Characterization, 58, 485–491.
• Cicek, A., Kara, F. and Kivak, T., (2015). Effects of Deep Cryogenic Treatment on the Wear Resistance and Mechanical Properties of AISI H13 Hot-Work Tool Steel, Journal of Materials Engineering and Performance, 24, 4431-4439.
• Collins, D. N. and Dormer, J., (1997). Deep Cryogenic Treatment of a D2 Cold Work Tool Steel, Heat Treament of Metals, 71–74.
• Das, D., Dutta, A.K. and Ray, K.K., (2010). Sub-zero Treatments of AISI D2 steel: Part I. Microstructure and Hardness, Materials Science and Engineering: A, 527, 2182-2193.
• Demir, İ. D. ve Uygur, İ., (2017). Kriyojenik İşlem Uygulanmış Dökme Demir Malzemelerin Mekanik Özelliklerinin İncelenmesi, Bilim ve Teknoloji Dergisi, 5, 210-219.
• Durica, J., Ptacinova, J. and Hudakova, M., (2010). Microstructure and Hardness of Cold Work Vanadis Steel after Subzero Treatment at -140°C, Metal, 1-5.
• Huang, J.Y, Zhu, Y.T. and Liao, XZ, (2003). Microstructure of Cryogenic Treated M2 Tool Steel, Materials Science and Engineering, 339(1–2), 241–244.
• Jurci, P., Domankova, M. and Caplovic, L., (2015). Microstructure and Hardness of Sub-zero Treated and No Tempered P/M Vanadis 6 Ledeburitic Tool Steel, Vacuum, 111, 92-101.
• Jurci P., DlouhY I. and Priknerova, P., (2018). Effect of Sub-Zero Treatment Temperatures on Hardness, Flexural Strength, and Fracture Toughness of Vanadis 6 Ledeburitic Die Steel, Metal, 8:1047, 1-15.
• Kaushal, A., Rajput, RS. and Vardhan, A., (2015). Effects of Cryogenic Treatment on Tool Steel AISI-D6, International Journal of Research in Engineering and Technology, 4(3), 470-473.
• Li, S., Xie, Y. and Wu, X., (2010). Hardness and Toughness Investigations of Deep Cryogenic Treated Cold Work Die Steel, Cryogenics, 50(2), 89-92.
• Li, H., Tong, W. and Cui, J., (2016). The Influence of Deep Cryogenic Treatment on the Properties of High-Vanadium Alloy Steel, Materials Science and Engineering: A, 662, 356-362.
• Moore, K. and Collins D. N., (1993). Cryogenic Treatment of Three Heat–Treated Tool Steels, Key Engineering Materials, 86–87,47–54.
• Nalbant, H., (2018). Derin Kriyojenik İşlemin AISI 4140 Çeliğinin Aşınma Davranışına Etkisi, Yüksek Lisans Tezi, Eskişehir Osmangazi Üniversitesi, Metalurji ve Malzeme Mühendisliği Anabilim Dalı, Eskişehir.
• Perez, M. and Belzunce, F.J., (2015). The Effect of Deep Cryogenic Treatments on the Mechanical Properties of an AISI H13 Steel, Materials Science and Engineering: A, 624, 32-40.
• Podgornik, B., Paulina, I. and Zajec, B., (2016). Deep Cryogenic Treatment of Tool Steels, Journal of Materials Processing Technology, 229, 398-406.
• Sobotova, J., Jurci, P. and Dlouhy, I., (2016). The Effect of Subzero Treatment on Microstructure, Fracture Toughness, and Wear Resistance of Vanadis 6 Tool Steel, Materials Science and Engineering: A, 652, 192-204.
• URL-1, (2020). https://www.uddeholm.com/files/PB_Uddeholm_vanadis_8_english.pdf. Uddeholm. (Erişim Tarihi: 09 Şubat 2020).
• Vahdat, S. E., Nategh, S. and Mirdamadi, S., (2013). Microstructure and Tensile Properties of 45WCrV7 Tool Steel After Deep Cryogenic Treatment, Materials Science and Engineering: A, 585, 444–454.
• Yan, X. G. and Li, D. Y., (2013). Effects of the Sub–zero Treatment Condition on Microstructure, Mechanical Behavior and Wear Resistance of W9Mo3Cr4V High Speed Steel, Wear, 302(1–2), 854–862.