Ductile to Brittle Transition Behavior in Cast Duplex Stainless Steels

被引：1

作者：

Takahashi, Osamu ^{[1
]}

Yabe, Morio ^{[2
]}

Shibui, Yohei ^{[3
]}

Tomota, Yo ^{[4
]}

机构：

[1] Nidak Corp, Dept Engn, Takahagi 3180004, Japan

[2] Nidak Corp, Prod Dept, Takahagi 3180004, Japan

[3] Ibaraki Univ, Ibaraki, Japan

[4] Ibaraki Univ, Grad Sch Sci & Engn, Ibaraki, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 2014年 / 100卷 / 09期

关键词：

duplex stainless steel; ductile-brittle transition; microstructure; electron backscatter diffraction; 3-dimensional observation; MORPHOLOGY; AUSTENITE; FERRITE; PHASE;

D O I：

10.2355/tetsutohagane.100.1150

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Influence of casting conditions and chemical compositions on ductile-to-brittle transition (DBT) behavior in duplex stainless steels was studied. Cleavage fracture of ferrite grain causes DBT in spite of ductile fracture of austenite grans at low temperature. Most influential factors on DBT temperature (DBTT) is chemical compositions, ferrite volume fraction and purity of cast steel. Compared with forged steels with similar fracture unit, the present cast steels show much lower DBTT, which is attributed to dispersed austenite grains that hinder the cleavage crack initiation and propagation. By using a serial sectioning 3D method, a group of austenite grains with an identical variant observed with a conventional 2D method was revealed to be connected each other.

引用

页码：1150 / 1157

页数：8

共 25 条

[1] MORPHOLOGY AND CRYSTALLOGRAPHY OF THE PRECIPITATION OF AUSTENITE AT FERRITE GRAIN-BOUNDARIES IN 2-PHASE STAINLESS-STEEL [J].