Effect of pack rolling on microstructures and tensile properties of as-forged Ti-44Al-6V-3Nb-0.3Y alloy

被引：53

作者：

Niu, H. Z. ^{[1
]}

Kong, F. T. ^{[1
]}

Kiao, S. L. ^{[1
]}

Chen, Y. Y. ^{[1
]}

Yang, F. ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

来源：

INTERMETALLICS | 2012年 / 21卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Titanium aluminides; based on TiAl; Rolling; Microstructure; Mechanical properties at ambient temperature; GAMMA-TITANIUM ALUMINIDES; TIAL-BASED ALLOYS; PHASE-TRANSFORMATIONS; DEFORMATION; TEMPERATURE; BEHAVIOR; FRACTURE;

D O I：

10.1016/j.intermet.2011.10.003

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 microstructures and tensile properties of Ti-44Al-6V-3Nb-0.3Y (at. %) alloy before and after hot rolling were investigated systematically. SEM results indicated that the as-rolled TiAl sheet was characterized by completely dynamically recrystallizated microstructures, except some refined lamellar colonies in the back end, which are primarily caused by the temperature drop during canned forging and subsequent pack rolling. By TEM analysis, the coarsening of gamma lamellae by alpha lath decomposition during hot rolling are found. Meanwhile, by EBSD measurements, the phase composition and grain features of the as-forged and the as-rolled conditions were characterized and compared. Additionally, the tensile properties were tested to find that the room temperature tensile strength decreased obviously after hot rolling, with yield strength decreasing from 620 MPa to 520 MPa along transverse direction (TD) and to 485 MPa in rolling direction (RD), and the UTS from 680 MPa to 598 MPa and 556 MPa respectively. The reason for the degradation of the tensile strength is interpreted detailedly. After being heat-treated in single a phase field, beta phase was eliminated from current deformed TiAl alloy and the tensile properties were enhanced obviously. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.

引用

页码：97 / 104

页数：8

共 33 条

[1] Microstructure and deformation of two-phase γ-titanium aluminides [J].

Appel, F ;

Wagner, R .

MATERIALS SCIENCE & ENGINEERING R-REPORTS, 1998, 22 (05) :187-268

[2] DEFORMATION PROCESSES RELATED TO INTERFACIAL BOUNDARIES IN 2-PHASE GAMMA-TITANIUM ALUMINIDES [J].

APPEL, F ;

BEAVEN, PA ;

WAGNER, R .

ACTA METALLURGICA ET MATERIALIA, 1993, 41 (06) :1721-1732

[3] Deformation behavior of differently processed γ-titanium aluminides [J].

Bartels, A ;

Kestler, H ;

Clemens, H .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 329 :153-162

[4] The relationships of microstructure and properties of a fully lamellar TiAl alloy [J].

Cao, GX ;

Fu, LF ;

Lin, JG ;

Zhang, YG ;

Chen, CQ .

INTERMETALLICS, 2000, 8 (5-6) :647-653

[5] Evaluation of ingots and alpha-extrusions of gamma alloys based on Ti-45Al-6Nb [J].

Carneiro, T ;

Kim, YW .

INTERMETALLICS, 2005, 13 (09) :1000-1007

[6] Microstructural stability of lamellar TiAl-based alloys at high temperature [J].

Chen, GL ;

Zhang, LC ;

Zhang, WJ .

INTERMETALLICS, 1999, 7 (11) :1211-1218

[7] Grain refinement in γ-TiAl-based alloys by solid state phase transformations [J].

Clemens, H. ;

Bartels, A. ;

Bystrzanowski, S. ;

Chladil, H. ;

Leitner, H. ;

Dehm, G. ;

Gerling, R. ;

Schimansky, F. P. .

INTERMETALLICS, 2006, 14 (12) :1380-1385

[8]

Clemens H, 2000, ADV ENG MATER, V2, P551, DOI 10.1002/1527-2648(200009)2:9<551::AID-ADEM551>3.0.CO

[9]

2-U

[10]

Clemens H, 1999, GAMMA TITANIUM ALUMINIDES 1999, P209

← 1 2 3 4 →