Effect of microstructure on static and dynamic mechanical properties of third generation advanced high strength steels
Başlık çevirisi mevcut değil.
- Tez No: 402059
- Danışmanlar: PROF. STEPHEN YUE
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Maden Mühendisliği ve Madencilik, Metallurgical Engineering, Mining Engineering and Mining
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: Mcgıll Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
The recent studies on steels have largely focused on the development of new advanced high strength sheet steels (AHSS), particularly for automotive applications.“First generation AHSS”are steels that primarily possess ferrite-based microstructures with tensile strength (in the as-rolled condition) in the range of 450 to 700 MPa, and“second generation AHSS”are austenitic steels with high manganese content in the range of 900 MPa to 1100 MPa tensile strength. Recently, there has been interest in the development of a“third generation”of AHSS, which are steels with strength-ductility combinations better than the first generation AHSS with a range of 20 000 MPa x %ε but at a cost significantly less than that of the second generation AHSS as a result of reducing expensive alloying elements. Therefore, the current approach to the development of third generation AHSS is to combine all the aspects of first and second generation steels in unique alloy/microstructure combinations to achieve the desired properties. Thus, the third generation of AHSS microstructures consists of a high strength phase (e.g., martensite or bainite) and a significant amount of ductility and work hardening from an austenite that exhibits deformation induced plasticity through transformation or twinning. In this thesis, four different steel compositions, centered on Mn as the main alloying element, are designated as candidates for third generation AHSS grades. The design of these steels is based on controlling the deformation behavior of the retained austenite. Thus, heat treatment process parameters are determined in order to obtain different amounts and morphologies of retained austenite. The evolution of the microstructure, during processing as well as deformation, is characterized by using optical and electron microscopy techniques and mechanical tests. The effect of alloy composition and processing parameters on the deformation mechanisms of these steels is discussed.
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