Plastic instability and strain rate sensitivity of ultrafine-grained iron

被引：19

作者：

Ding, Yi ^{[1
]}

Jiang, Jianhua ^{[1
]}

Shan, Aidang ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 487卷 / 1-2期

关键词：

Iron; Ultrafine grain; Uniaxial tensile test; Plastic instability; Strain rate sensitivity; SHEAR BANDS; NANOCRYSTALLINE; DEFORMATION; BEHAVIOR; SIZES;

D O I：

10.1016/j.jallcom.2009.08.004

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：

Plastic instability and strain rate sensitivity (SRS) of the ultrafine-grained (UFG) iron subjected to asymmetric rolling (ASR) have been studied through uniaxial tensile test. In addition to the high strength due to grain refinement, the tensile curve of the UFG iron shows severe plastic instability. The plastic instability becomes more with the decreasing SRS value. The low SRS value results in the severe plastic instability. The SRS value within the grain size range from 0.9 to 25 mu m has been measured and is found to decrease with the decreasing grain size. The evolution of the SRS value against the grain size is explained using a simple model based on H-P relationship. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：517 / 521

页数：5

共 15 条

[1]

DING Y, 2009, MAT SCI ENG A-STRUCT, P76

[2] Plastic anisotropy in bcc transition metals [J].

Duesbery, MS ;

Vitek, V .

ACTA MATERIALIA, 1998, 46 (05) :1481-1492

[3] THEORY OF TENSILE TEST [J].

HART, EW .

ACTA METALLURGICA, 1967, 15 (02) :351-&

[4] MEASUREMENT OF STRAIN-RATE SENSITIVITY IN SUPERPLASTIC ALLOYS [J].

HEDWORTH, J ;

STOWELL, MJ .

JOURNAL OF MATERIALS SCIENCE, 1971, 6 (08) :1061-&

[5] Grain-size dependence of plastic deformation in nanocrystalline Fe [J].

Jang, D ;

Atzmon, M .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (11) :9282-9286

[6] Deformation behavior and plastic instabilities of ultrafine-grained titanium [J].

Jia, D ;

Wang, YM ;

Ramesh, KT ;

Ma, E ;

Zhu, YT ;

Valiev, RZ .

APPLIED PHYSICS LETTERS, 2001, 79 (05) :611-613

[7] Effects of nanocrystalline and ultrafine grain sizes on constitutive behavior and shear bands in iron [J].

Jia, D ;

Ramesh, KT ;

Ma, E .

ACTA MATERIALIA, 2003, 51 (12) :3495-3509

[8] Failure mode and dynamic behavior of nanophase iron under compression [J].

Jia, D ;

Ramesh, KT ;

Ma, E .

SCRIPTA MATERIALIA, 1999, 42 (01) :73-78

[9] Instabilities and ductility of nanocrystalline and ultrafine-grained metals [J].

Ma, E .

SCRIPTA MATERIALIA, 2003, 49 (07) :663-668

[10] Strain rate sensitivity of nanocrystalline and ultrafine-grained steel obtained by mechanical attrition [J].

Rodriguez-Baracaldo, R. ;

Benito, J. A. ;

Caro, J. ;

Cabrera, J. M. ;

Prado, J. M. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 485 (1-2) :325-333

← 1 2 →