Effects of Tempering Heat Treatment Temperatures on Mechanical Properties of Carbon Steels

Yıl 2021, Cilt: 7 Sayı: 1, 17 - 25, 30.04.2021

Nursel Altan Özbek Erdem Saraç

Öz

In the present study, the effects of tempering heat treatment temperatures on the mechanical properties of AISI 1020 and 1040 carbon steel types, which have a wide range of use in industry, were investigated. The samples were quenched at 850 °C, and then they were tempered at three different temperatures; 450, 550, and 650 °C, for 1 hour. Hardness measurements of the samples were performed to determine their mechanical properties. Besides, the samples were subjected to tensile and charpy impact tests. The samples were examined microstructurally, as well. The results reveal that the hardness, tensile strength, and yield strength values of both samples decreased when tempering heat treatment was applied after quenching. As the tempering temperature increased, these values tended to decrease. However, the impact value increased with the tempering heat treatment and increasing tempering temperature 

Anahtar Kelimeler

AISI 1020 and AISI 1040 steel, Tempering temperature, Mechanical properties, Tensile strength, Charpy impact test

Temperleme Isıl İşlem Sıcaklıklarının Karbonlu Çeliklerin Mekanik Özelliklerine Etkileri

Öz

Bu çalışmada, temperleme ısıl işlem sıcaklıklarının endüstride geniş bir kullanım alanına sahip olan AISI 1020 ve 1040 karbon çeliklerin mekanik özellikleri üzerine etkileri araştırılmıştır. Numuneler 850 ° C'de su verme işleminin ardından 450, 550 ve 650 ° C olmak üzere üç farklı sıcaklıkta 1 saat süre ile temperlenmiştir. Numunelerin mekanik özelliklerini belirlemek için sertlik ölçümleri, çekme ve çentik darbe testleri yapılmıştır. Ayrıca numuneler mikroyapısal olarak da incelenmiştir. Sonuçlar, su verme işleminden sonra temperleme ısıl işlemi uygulandığında her iki numunenin sertlik, çekme dayanımı ve akma dayanımı değerlerinin düştüğünü ortaya koymaktadır. Temperleme sıcaklığı arttıkça, bu değerler düşme eğiliminde olmuştur. Ancak, temperleme ısıl işlemi ve artan temperleme sıcaklığı ile darbe değerleri artmıştır.

Anahtar Kelimeler

AISI 1020 ve AISI 1040 çeliği, Temperleme sıcaklığı, Mekanik özellikler, Çekme dayanımı, Çentik darbe deneyi

Kaynakça

• [1] W.D. Jr. Callister and D.G. Rethwisch, Materials Science and Engineering, Eight Edition, Asia: John Wiley & Sons, 2015.
• [2] T.V. Rajan, C.P. Sharma and A. Sharma, Heat Treatment: Principles and Techniques, New Delhi: PHI Learning Pvt. Ltd.. 2011.
• [3] A. Verma and P.K. Singh, “Influence of heat treatment on mechanical properties of AISI 1040 Steel,” IOSR Journal of Mechanical and Civil Engineering, vol. 10, no. 2, pp. 32-38, 2013.
• [4] U. Çalıgülü, M. Aras and M. Türkmen, “Effect of tempering on microstructure and hardness properties of oil quenched steel”, In 4th International Symposium on Innovative Technologies in Engineering and Science (ISITES2016), 3-5 November, 2016, Alanya/Antalya-Turkey, 2016. pp. 600-607.
• [5] S.M. Rahman, K.E. Karim and M.H.S. Simanto, “Effect of heat treatment on low carbon steel: an experimental investigation,” In Applied Mechanics and Materials, vol. 860, pp. 7-12, 2017.
• [6] H. Guler and R. Ozcan, “Effect of quenching process on mechanical properties of high carbon steels,” Uludağ University Journal of The Faculty of Engineering, vol. 19, no. 2, pp. 77-83, 2014.
• [7] N.S. Koksal, M. Uzkut and B.S. Unlu, “Differences in mechanical properties of steels of different carbon concentration by heat treatment,” DEÜ Mühendislik Fakültesi Fen ve Mühendislik Dergisi, vol. 6, no. 2, pp. 95-100, 2004.
• [8] W.S. Lee and T.T. Su, “Mechanical properties and microstructural features of AISI 4340 high-strength alloy steel under quenched and tempered conditions,” Journal of Materials Processing Technology, vol. 87, no. 1-3, pp. 198-206, 1999.
• [9] A.H. Meysami, R. Ghasemzadeh, S.H. Seyedein and M.R. Aboutalebi, “An investigation on the microstructure and mechanical properties of direct-quenched and tempered AISI 4140 steel,” Materials & Design, vol. 31, no. 3, pp. 1570-1575, 2010.
• [10] A. Salemi and A. Abdollah-Zadeh, “The effect of tempering temperature on the mechanical properties and fracture morphology of a NiCrMoV steel,” Materials Characterization, vol. 59, no. 4, pp. 484-487, 2008.