Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573253 | Materials Science and Engineering: A | 2016 | 9 Pages |
Abstract
14% Cr oxide dispersion strengthened (ODS) steels were produced. The effects of sintering temperature on the microstructure and mechanical properties were investigated. The microstructures of 14Cr-ODS steels were characterized by using electron backscattered diffraction (EBSD), transmission electron microscopy (TEM) and synchrotron radiation small angle X-ray scattering (SAXS). The results showed that ultrafine grains are formed in the ODS steels sintered at low temperature, and a mixed microstructure of fine grains and coarse grains is observed in the steels sintered at high temperature. With the increasing of sintering temperature from 950 °C to 1025 °C, the average grain sizes increase from 290 nm to 2420 nm. High-density nanoscale Y-rich oxides and some large Cr-rich oxides are observed. The nanoscale Y-rich oxides are dominated in the SPSed ODS steels. The number density of Y-rich oxides decreases but the average size increases with the increasing sintering temperature, and the size and number density of Cr-rich oxides increase with increasing temperature. The tensile strength of the samples sintered at 950 °C is higher than that of the sample sintered at higher temperature.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Zhengyuan Li, Zheng Lu, Rui Xie, Chenyang Lu, Chunming Liu,