Investigation microstructure development in steels using dilatometer
Başlık çevirisi mevcut değil.
- Tez No: 727126
- Danışmanlar: DR. KENNETH GYVES
- Tez Türü: Yüksek Lisans
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: The Unıversıty Of Manchester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
The impact of the thermomechanical treatments on the microstructure and properties of the EN8 medium carbon steel and the 316 stainless steel were analysed in this research. Samples were subjected to a variety of heat treatments in order to observe the effect of the austenitizing process and cooling rate on the microstructural evolution and mechanical properties of these steels. Specimens were heated to 900°C at a constant heating rate of 10°C/s and austenitized at this temperature for 30 seconds, 300 seconds and 3000 seconds before applying cooling at the rates of 0.1°C/s, 1°C/s, 10°C/s and 100°C/s by using dilatometer. Besides, austenitizing temperatures including 1000°C and 1200°C were employed for the 316 stainless steel samples with the same austenitizing times and at the heating and cooling rates of 10°C/s. Transformation behaviours of the each heat treatment for the EN8 steel samples were recorded and based on these records, dilatometric curves were constructed and transformation temperatures were found. Austenite to ferrite phase transformation was observed for the EN8 steel samples at each cooling rate. Besides, austenite to martensite transformation was monitored as well at a cooling rate of 100°C/s. Initial and final microstructures and mechanical properties of the samples were evaluated by optical microscopy, scanning electron microscopy and Vickers hardness test. Represented phases in the microstructures, the volume fraction of these phases, sizes of the grains and microhardness values of the samples were identified. Results indicated that while the microstructure of the 316 stainless steel consists of only austenitic phase in each case due to not having phase transformation, the microstructure of the EN8 medium carbon steel samples is dominated by ferrite plus pearlite structure. Only different and complex structure of the EN8 steel was obtained at the end of 100°C/s cooling rate, including martensite and probably the bainite instead of pearlite. It was reported that increased cooling rate results in lowered austenite to ferrite transformation temperature, therefore, finer grains in the structure and improved hardness values. Similar results were found at lower austenitizing time and temperature as well. The relation between the microstructure and properties of the samples were clearly determined.
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