Isıl İşlem Parametrelerinin TWIP Çeliğinin Mikro Yapısı Ve Mekanik Davranışı Üzerindeki Etkileri

Abstract

Bu çalışmada, farklı ısıl işlem sıcaklıkları ve sürelerinin ikizlenme kaynaklı plastisite (Twinning Induced Plasticity-TWIP) çeliğinin mekanik özellikleri ve mikro yapısı üzerindeki etkileri incelenmiştir. Dökümle üretilen TWIP çelik levhalar sırasıyla sıcak ve soğuk haddeleme işlemleriyle levha haline getirilmiştir. Isıl işlemler 600, 700, 800 ve 900 °C 'de 20, 60 ve 150 dakika süreyle gerçekleştirilmiştir. Yapılan deneyler sonucunda, 600 °C ve 700 °C'de temperlenmiş saclarda ikizlenme yerine M3C karbür çökeltileri oluşmuş, 800 °C ve 900 °C'de ise ikizlenme meydana gelmiştir. Mikroyapı analizleri ve mekanik test sonuçları ayrıca karbür çökeltilerinin ikiz düzlemlerinin oluşumunu engellediğini göstermiştir. Yapılan Vickers cinsinden sertlik ve çekme testleri sonuçları 600 °C ve 700 °C'de karbürlerin varlığının, 800 °C ve 900 °C'de ise ikizlenme plakalarının yoğun olduğunu göstermiştir. Tavlama sıcaklığı ve süresi arttıkça sertlik ve çekme mukavemetinde azalma gözlemlenmiştir. Uzama ise artmıştır. Fakat 600 °C’ de 20 dakika yapılan tavlama sonucunda yüzde uzama miktarı ve çekme mukavemeti değeri ısıl işlemsiz numuneye göre artış göstermiştir.

Keywords

• TWIP çeliği
• ısıl işlem
• mikro yapı
• mekanik özellikler

Influences of Heat Treatment Parameters on Microstructure And Mechanical Behavior of TWIP Steel

Abstract

In this study, the effects of different heat treatment temperatures and times on the mechanical properties and microstructure of Twinning Induced Plasticity (TWIP) steel were examined. TWIP steel slabs produced by casting were shaped into plates by hot and cold rolling processes, respectively. The heat treatments were carried out at 600, 700, 800, and 900 °C for 20, 60, and 150 min. As a result of the experiments, M3C carbide precipitates were formed instead of twinning in the tempered sheets at 600 °C and 700 °C, and twinning occurred at 800 °C and 900 °C. The microstructure analysis and mechanical test results demonstrate that the carbide precipitates prevent twinning plane formation. The Vickers hardness and tensile test results showed the intense presence of carbides at 600 °C and 700 °C and twinning at 800 °C and 900 °C. As the annealing temperature and time increased, a decrease in hardness and tensile strength was observed. Elongation increased. However, as a result of annealing at 600 °C for 20 minutes, an increase in elongation and tensile strength was observed compared to the untreated sample.

Keywords

• TWIP steel
• heat treatment
• microstructure
• mechanical properties

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