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مقاله High Temperature Behavior of the UNS S32950 and UNS S31260 Duplex Steels تحت pdf
تاريخ : 24 مهر 1395 | <-PostTime-> | نویسنده : ali | بازدید : <-PostHit->

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بخشی از متن مقاله High Temperature Behavior of the UNS S32950 and UNS S31260 Duplex Steels تحت pdf :

سال انتشار: 1389

محل انتشار: اولین همایش ملی فولادهای پیشرفته

تعداد صفحات: 8

نویسنده(ها):

Hassan Nosrati – R&D Manager, Stainless Steel Division, Arvin Decorative Metals Company, Tehran, Iran
Hamidreza Baharvandi – Malek Ashtar University of Technology, Tehran, Iran
Naser Ehsani – Malek Ashtar University of Technology, Tehran, Iran

چکیده:

Two types of duplex stainless steels were deformed by torsion at a temperature range of 900 to 1200 °C and strain rate of 1.0 s-1 and their finalicrostructures were observed. The austenite volume fraction of steel A (S32950) is approximately 25% at room temperature, after conventional annealing, while that of steel B (S31260) is around 55%. Experimental data show that steel A is ductile at high temperatures and displays low ductility at low temperatures, while steel B has low ductility in the entire range of temperatures studied. At high temperatures, steel A is essentially ferritic and shows dynamic recrystallized grains after deformation. When steel A is strained at low temperatures and displays low austenite volume fraction, microstructural observations indicate that failure is triggered by grain boundary sliding due to the formation of an austenite net structure at the ferrite grain boundaries. At intermediate volume fraction, when austenite forms a dispersed second-phase in steels A and B, failure begins at the ferrite/ferrite boundaries since some of the new ferrite grains may become immobilized by the austenite particles. When steel B is strained at volume fraction of around 50% of austenite and both phases percolate the microstructure, failure occurs after low straining as a consequence of the different plastic behaviors of each of the phases. The failure characteristics of both steels are correlated not only with the volume fraction of austenite but also with its distribution within the ferrite matrix, which limits attainable strain without failure.


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