Effects of extrusion temperature on the nano-mesoscopic structure and mechanical properties of an Al-alloyed high-Cr ODS ferritic steel

被引：56

作者：

Dou, Peng ^{[1
]}

Kimura, Akihiko ^{[1
]}

Okuda, Takanari ^{[2
]}

Inoue, Masaki ^{[3
]}

Ukai, Shigeharu ^{[4
]}

Ohnuki, Somei ^{[4
]}

Fujisawa, Toshiharu ^{[5
]}

Abe, Fujio ^{[6
]}

机构：

[1] Kyoto Univ, Inst Adv Energy, Kyoto 6110011, Japan

[2] Kobelco Res Inst, Nishi Ku, Kobe, Hyogo 6512271, Japan

[3] Japan Atom Energy Agcy, Adv Nucl Syst R&D Directorate, Oarai, Ibaraki 3111393, Japan

[4] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[5] Nagoya Univ, EcoTopia Sci Inst, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[6] Natl Inst Mat Sci, Struct Met Ctr, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2011年 / 417卷 / 1-3期

关键词：

D O I：

10.1016/j.jnucmat.2011.01.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nano-mesoscopic structure of a newly developed Al-alloyed high-Cr oxide-dispersion-strengthened (ODS) ferritic steel, which was extruded at 1150 and 1050 degrees C, has been characterized by transmission electron microscopy to correlate with microhardness at room temperature. The grain size decreases, the number density of the oxide particles increases and their size decreases, and the microhardness increases, with decreasing extrusion temperature. After extrusion at 1150 degrees C, most of the oxide particles in the ODS steel are semi-coherent (78%). The semi-coherent particles were divided into two types with almost equal fraction according to the spacings of surrounding misfit moire fringes, which are about 2 nm and 1.65 nm, indicating the misfit strains to be 0.075 and 0.092, respectively. After 1050 degrees C extrusion, most of the oxide particles are coherent (86%). The misfit strains of the coherent particles and a few semi-coherent particles are about 0.035 and 0.075, respectively. The strengthening mechanism is briefly discussed. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：166 / 170

页数：5

共 11 条

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