Manufacturing of Low and High-carbon TRIP Steels by Modeling CCT Diagrams, Design of Microstructure Maps and Tensile Properties

Öz

Although TRIP steels are the first-generation steel for the automotive industry, their high strength, formability, and strength after forming are versatile and widely used automotive steel. This study attempts to evaluate the automotive TRIP steels' manufacturing chains, thermal process, microstructure, and tensile properties via experimental modeling (CCT diagrams-microstructure maps) on two steel groups with low cost. The TRIP Steels manufacturing chains are chemical design, investment casting, hot rolling, and TRIP thermal processes modeling and applications. Experimental techniques performed on samples, meaning characterizations, are image analysis, XRD, hardness, and tensile tests. The results showed that a small amount of martensite transformation occurs during air cooling after the bainitic retention because of the low alloy content. As a result, modeling and microstructure maps have been successfully combined and studied in detail to design and manufacture the TRIP sheet steel.

Anahtar Kelimeler

• TRIP steel
• Microstructure maps
• Bainitic isothermal holding
• Cooling diagrams
• Tensile properties

Proje Numarası

KBÜBAP-17-YL-431, KBÜ-BAP-13/2-DS-054

CCT Diyagramları Modellenmesiyle Düşük ve Yüksek Karbonlu TRIP Çeliklerinin Üretimi, Mikroyapı Haritalarının Dizaynı ve Çekme özellikleri

Öz

TRIP çelikleri otomotiv endüstrisi için birinci nesil çelik olmasına rağmen yüksek mukavemeti, şekillendirilebilirliği ve şekillendirme sonrası mukavemeti çok yönlü ve yaygın olarak kullanılan otomotiv çeliğidir. Bu çalışma, otomotiv TRIP çeliklerinin üretim zincirlerini, ısıl süreçlerini, mikro yapılarını ve çekme özelliklerini, düşük maliyetli iki çelik grubu üzerinde deneysel modelleme (CCT diyagramları-mikro yapı haritaları) yoluyla değerlendirmeyi amaçlamaktadır. TRIP çeliklerinin üretim zincirleri kimyasal tasarım, hassas döküm, sıcak haddeleme ve TRIP termal proses modelleme ve uygulamalarıdır. Numuneler üzerinde gerçekleştirilen deneysel teknikler, yani karakterizasyonlar, görüntü analizi, XRD, sertlik ve çekme testleridir. Sonuçlar, beynitik tutmanın ardından havayla soğutma sırasında düşük alaşım içeriği nedeniyle az miktarda martenzit dönüşümünün meydana geldiğini gösterdi. Sonuç olarak, TRIP çelik sacın tasarımını ve üretimini gerçekleştirmek için modelleme ve mikro yapı haritaları başarıyla birleştirildi ve ayrıntılı olarak incelendi.

Anahtar Kelimeler

• TRIP çeliği
• Beynitik izotermal tutma
• Mikroyapı haritaları
• Soğuma diyagramları
• Çekme özellikleri

Destekleyen Kurum

Karabuk Universtiy

Proje Numarası

KBÜBAP-17-YL-431, KBÜ-BAP-13/2-DS-054

Teşekkür

The authors gratefully acknowledge the support of the Karabuk University Science Project Commission (KBU-BAP: KBÜBAP-17-YL-431, KBÜ-BAP-13/2-DS-054) and Assoc. Prof. Ersoy Erişir for software using.

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