The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel

被引：15

作者：

Kral, Petr ^{[1
]}

Dvorak, Jiri ^{[1
]}

Sklenicka, Vaclav ^{[1
]}

Masuda, Takahiro ^{[2
]}

Horita, Zenji ^{[2
]}

Kucharova, Kveta ^{[1
]}

Kvapilova, Marie ^{[1
]}

Svobodova, Marie ^{[3
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic

[2] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan

[3] UJP PRAHA As, Kaminkou 1345, Prague 15610, Czech Republic

来源：

MATERIALS | 2018年 / 11卷 / 05期

关键词：

creep-resistant 9% Cr steels; ultrafine grained materials; creep; electron back scatter diffraction; HIGH-PRESSURE TORSION; SEVERE PLASTIC-DEFORMATION; MARTENSITE FERRITIC STEELS; FE2W LAVES PHASE; LONG-TERM CREEP; STRENGTHENING MECHANISMS; PRECIPITATION BEHAVIOR; RESISTANT STEELS; ROOM-TEMPERATURE; 9CR STEELS;

D O I：

10.3390/ma11050787

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The microstructure was investigated using transmission electron microscopy and scanning electron microscopy equipped with an electron-back scatter detector. It was found that ultrafine-grained steel exhibits significantly faster minimum creep rates, and there was a decrease in the value of the stress exponent in comparison with coarse-grained P92 steel. Creep results also showed an abrupt decrease in the creep rate over time during the primary stage. The abrupt deceleration of the creep rate during the primary stage was shifted, with decreasing applied stress with longer creep times. The change in the decline of the creep rate during the primary stage was probably related to the enhanced precipitation of the Laves phase in the ultrafine-grained microstructure.

引用

页数：14

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