کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7970975 | 1514398 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of dew point on the formation of surface oxides of twinning-induced plasticity steel
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of dew point on the formation of surface oxides of twinning-induced plasticity steel Effect of dew point on the formation of surface oxides of twinning-induced plasticity steel](/preview/png/7970975.png)
چکیده انگلیسی
The surface oxides of twinning-induced plasticity (TWIP) steel annealed at 800 °C for 43 s were investigated using transmission electron microscopy. During the annealing process, the oxygen potential was controlled by adjusting the dew point in a 15%H2-N2 gas atmosphere. It was found that the type of surface oxides formed and the thickness of the oxide layer were determined by the dew point. In a gas mixture with a dew point of â 20 °C, a MnO layer with a thickness of ~ 100 nm was formed uniformly on the steel surface. Under the MnO layer, a MnAl2O4 layer with a thickness of ~ 15 nm was formed with small Mn2SiO4 particles that measured ~ 70 nm in diameter. Approximately 500 nm below the MnAl2O4 layer, Al2O3 was formed at the grain boundaries. On the other hand, in a gas mixture with a dew point of â 40 °C, a MnAl2O4 layer with a thickness of ~ 5 nm was formed on most parts of the surface. On some parts of the surface, Mn2SiO4 particles were formed irregularly up to a thickness of ~ 50 nm. Approximately 200 nm below the MnAl2O4 layer, Al2O3 was found at the grain boundaries. Thermodynamic calculations were performed to explain the experimental results. The calculations showed that when aO2 > ~ 1.26 Ã 10â 28, MnO, MnAl2O4, and Mn2SiO4 can be formed together, and the major oxide is MnO. When aO2 is in the range of 1.26 Ã 10â 28-2.51 Ã 10â 31, MnO is not stable but MnAl2O4 is the major oxide. When aO2 < ~ 2.51 Ã 10â 31, only Al2O3 is stable. Consequently, the effective activity of oxygen is considered the dominant factor in determining the type and shape of surface oxides of TWIP steel.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 89, March 2014, Pages 138-145
Journal: Materials Characterization - Volume 89, March 2014, Pages 138-145
نویسندگان
Yunkyum Kim, Joonho Lee, Kwang-Soo Shin, Sun-Ho Jeon, Kwang-Geun Chin,