Microstructural evolution of Fe-32%Ni alloy during large strain multi-axial forging

被引：22

作者：

Han, Baojun ^{[1
]}

Xu, Zhou ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Key Lab High Temp Mat & Tests, Minist Educ, Shanghai 200030, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 447卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

large strain; electron backscatter diffraction (EBSD); Fe-32%Ni alloy; transmission electron microscope (TEM); grain refinement;

D O I：

10.1016/j.msea.2006.10.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

High-resolution electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) were used to study the microstructural development of Fe-32%Ni alloy during large strain multi-axial forging. The forgings were carried out at the temperature of 773 K and strain rate of 10(-2) s(-1). The EBSD enables more detailed quantitative measurements to be made than possible with the TEM. The results show that two main microstructural changes take place as the cumulative strain increases. Firstly, the grains are obviously refined and become randomly distributed. Secondly, the volume fraction of high angle boundaries increases. Change in the strain path might be the reason why the volume fraction of high angle boundaries increases with increasing cumulative strain. Grain subdivision and rotation are regarded as the mechanism of structure refinement. The mechanism is termed as continuous dynamic recrystallization (CDRX). (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：119 / 124

页数：6

共 23 条

[1] Substructures and internal stresses developed under warm severe deformation of austenitic stainless steel [J].

Belyakov, A ;

Sakai, T ;

Miura, H ;

Kaibyshev, R .

SCRIPTA MATERIALIA, 2000, 42 (04) :319-325

[2] Production of ultra-fine grain microstructures in Al-Mg alloys by coventional rolling [J].

Gholinia, A ;

Humphreys, F ;

Prangnell, PB .

ACTA MATERIALIA, 2002, 50 (18) :4461-4476

[3] Development of microstructure in FCC metals during cold work [J].

Hansen, N ;

Jensen, DJ .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1999, 357 (1756) :1447-1469

[4] Structure of Cu deformed by high pressure torsion [J].

Hebesberger, T ;

Stüwe, HP ;

Vorhauer, A ;

Wetscher, F ;

Pippan, R .

ACTA MATERIALIA, 2005, 53 (02) :393-402

[5] Evolution mechanism of grain refinement based on dynamic recrystallization in multiaxially forged austenite [J].

Huang, J ;

Xu, Z .

MATERIALS LETTERS, 2006, 60 (15) :1854-1858

[6] High angle boundaries formed by grain subdivision mechanisms [J].

Hughes, DA ;

Hansen, N .

ACTA MATERIALIA, 1997, 45 (09) :3871-3886

[7] Characterisation of fine-scale microstructures by electron backscatter diffraction (EBSD) [J].

Humphreys, FJ .

SCRIPTA MATERIALIA, 2004, 51 (08) :771-776

[8] Review - Grain and subgrain characterisation by electron backscatter diffraction [J].

Humphreys, FJ .

JOURNAL OF MATERIALS SCIENCE, 2001, 36 (16) :3833-3854

[9]

HUMPHREYS FJ, 1999, JPN I METALS

[10] The application of EBSD to the study of substructural development in a cold rolled single-phase aluminium alloy [J].

Hurley, PJ ;

Humphreys, FJ .

ACTA MATERIALIA, 2003, 51 (04) :1087-1102

← 1 2 3 →