Hydrogen Embrittlement of Submicrocrystalline Ultra-Low Carbon Steel Produced by High-Pressure Torsion Straining

被引：7

作者：

Todaka, Yoshikazu ^{[1
]}

Morisako, Kazunobu ^{[1
]}

Kumagai, Masaaki ^{[1
]}

Matsumoto, Yoshihisa ^{[2
]}

Umemoto, Minoru ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Dept Prod Syst Engn, Tempaku Ku, Hibarigaoka 1-1, Toyohashi, Aichi 4418580, Japan

[2] Oita Natl Coll Technol, Dept Engn Mech, Oita 8700152, Japan

来源：

THERMEC 2009 SUPPLEMENT: 6TH INTERNATIONAL CONFERENCE ON PROCESSING & MANUFACTURING OF ADVANCED MATERIALS | 2010年 / 89-91卷

关键词：

severe plastic deformation (SPD); ultrafine grained microstructure; ferritic steel; small punch test; tensile property; TENSILE BEHAVIOR; SIMPLE SHEAR; STRENGTH;

D O I：

10.4028/www.scientific.net/AMR.89-91.763

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile property and hydrogen embrittlement (HE) behavior in the submicrocrystalline ultra-low carbon steel produced by HPT straining were investigated. Elongated grains with 300 nm thickness and 600 nm length with high dislocation density were formed by the HPT straining at a rotation-speed of 0.2 rpm under a compression pressure of 5 GPa. The engineering tensile strength of the HPT processed ultra-low carbon steel for > 5 turns was 1.9 GPa, which is similar to the value of maraging high-alloy steels. The elongation increased with strain (at 5 to 10 turns), is caused by the reduction of the stress concentration due to the existence of continuously recrystallized grains. HE occurred in the HPT processed specimen for 5 turns with high tensile strength of 1.9 GPa under hydrogen atmosphere. However, its HE was suppressed via recovery process by annealing at low temperature while maintaining the high strength.

引用

页码：763 / +

页数：8

共 19 条

[1] SMALL PUNCH TEST EVALUATION OF INTERGRANULAR EMBRITTLEMENT OF AN ALLOY-STEEL [J].