2019 Pittsburgh AISTech

Evolution of Oxide Inclusions in 304 Stainless Steel Treated by Rare Earth During Isothermal Heating at 1,473 K (1,200℃) (Room 412)

08 May 19
9:00 AM - 9:30 AM

Tracks: Metallurgy - Processing, Products & Applications

Speaker(s): Xueliang Zhang, PhD candidate, University of Science & Technology Beijing; Maolin Ye, University of Science & Technology Beijing; Shufeng Yang, University of Science & Technology Beijing; Jingshe Li, University of Science & Technology Beijing; Jinqiang Wu, University of Science & Technology Beijing; Yongfeng Chen, Wuhu Xinxing Casting Pipes Co. Ltd.

Evolution of oxide inclusions in 304 stainless steel treated by yttrium during 2 hours isothermal heating at 1473 K (1200℃) was investigated in this study. Homogeneous spherical Al-Y-Si-Mn-Cr-O inclusions were observed in as-cast steel. After heat treatment, the homogenous oxide inclusions changed to inhomogeneous ones with gray phase (Y-rich part) and black phase (Al-rich part). The shape of inclusions changed from spherical to irregular, and both the average size and number density of inclusions slightly increased. The mechanism of the evolution was proposed as the solid-state reaction between the oxide inclusions and yttrium element in the steel matrix during heating.