کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1642220 | 1517222 | 2016 | 4 صفحه PDF | دانلود رایگان |
• A TWIP steel was processed by high pressure torsion at 20 °C and 300 °C.
• After HPT at 20 °C an austenite + ϵ -martensite UFG state is formed with ∼50nm grain size.
• After HPT at 300 °C a fully austenite UFG state is formed with ∼90nm grain size.
• Both states demonstrate extraordinary high hardness up to 580 Hv.
We report on the changes in microstructure and phase composition in a high-Mn steel due to severe plastic deformation realized via high pressure torsion at different temperatures. Severe straining conducted at 20 °C and 300 °C allowed producing nanostructural states with a mean grain size less than 100 nm. Besides, straining at room temperature leaded to formation of strain-induced ε-martensite while at 300 °C fully austenite state was produced. Despite the revealed differences both states demonstrated similar, notably increased level of hardness up to ∼580 Hv.
Journal: Materials Letters - Volume 166, 1 March 2016, Pages 321–324