Microstructural characterization and strengthening mechanisms of a 15Cr-ODS steel produced by mechanical alloying and Spark Plasma Sintering

被引：25

作者：

Li, Weijuan ^{[1
]}

Xu, Haijian ^{[1
,2
,3
,4
,5
]}

Sha, Xiaochun ^{[3
]}

Meng, Jingsong ^{[3
]}

Wang, Wenzhong ^{[3
]}

Kang, Chao ^{[3
]}

Zhang, Ximin ^{[1
]}

Wang, Zhaodong ^{[5
]}

机构：

[1] Univ Sci & Technol Liaoning, Sch Mat & Met, Anshan 114051, Peoples R China

[2] Ansteel Grp Corp, State Key Lab Met Mat Marine Equipment & Applicat, Anshan 114009, Peoples R China

[3] Angang Steel Co Ltd, Anshan 114009, Peoples R China

[4] Hokkaido Univ, Fac Engn, Mat Sci & Engn, Sapporo, Hokkaido 0608628, Japan

[5] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China

来源：

FUSION ENGINEERING AND DESIGN | 2018年 / 137卷

基金：

中国国家自然科学基金;

关键词：

Spark Plasma Sintering (SPS); Microstructure; Small angle X-ray scattering (SAXS); Yield strength; Ti and Zr additions; FERRITIC STEELS; PRECIPITATION KINETICS; ZIRCONIUM ADDITION; ODS ALLOYS; DISPERSION; EVOLUTION; DUCTILITY; TEMPERATURE; NANOCRYSTALLINE; CONSOLIDATION;

D O I：

10.1016/j.fusengdes.2018.08.020

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The microstructure of the oxide dispersion strengthened (ODS) Fe-15Cr ferritic steel with Ti and Zr additions was characterized using transmission electron microscopy (TEM), elemental mapping, synchrotron small angle X-ray scattering (SAXS) and electron backscatter diffraction (EBSD) techniques. The results showed that bimodal grain size distribution in the matrix was observed, which is attributed to the heterogeneous recrystallization process during the Spark Plasma Sintering (SPS). TEM and SAXS results showed that very high density nanoscale oxides are formed in 15Cr-ODS steel. Large concentration of nm-scale trigonal-phase Y4Zr3O12 oxides and some large oxides of monoclinic CrTi2O5 are observed in specimen by high resolution TEM (HRTEM) and Energy-dispersive X-ray spectroscopy (EDS) mapping. Finally, the yield stress was experimentally measured and quantitatively estimated. The findings indicated that theoretical calculation was in accordance with the experimental results, and strengthening contributions from solute atoms, grains boundaries, dislocations and oxides was presented.

引用

页码：71 / 78

页数：8

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