The effect of heat treatment on crack control and grain refinement in laser beam welded β-solidifying TiAl-based alloy

被引：50
作者：
Liu, J. [1 ,2 ]
Dahmen, M. [2 ]
Ventzke, V. [1 ]
Kashaev, N. [1 ]
Poprawe, R. [2 ]
机构：
[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany
[2] Fraunhofer Inst Laser Technol ILT, D-52074 Aachen, Germany
来源：
INTERMETALLICS | 2013年 / 40卷
关键词：
Titanium aluminides; based on TiAl; Phase transformation; Laser processing; Microstructure; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; MICROSTRUCTURAL REFINEMENT; IN-SITU; COMPOSITES; NB; AL; SOLIDIFICATION; SYSTEM; SHEET;
D O I：
10.1016/j.intermet.2013.04.007
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：
Investigations were conducted on the gamma-TiAl-based alloy Ti-42Al-2.5Cr-1Nb-0.7Si-0.5B (at. %) to assess the influence of in situ and conventional post-weld heat treatment on the microstructure and microtexture transformations induced by laser beam welding. It was found that in situ post-weld heat treatment at 800 degrees C was important to inhibit weld seam cracking. EBSD and HEXRD results indicated that the welding zone mainly consisted of coarse alpha(2) "textured colonies". These textured alpha(2) are found to be in Burgers orientation relationship with their parent beta grains. After 1 h of conventional post-weld heat treatment at 1200 degrees C followed by furnace cooling, the textured colonies are refined. The alpha(2) grains nucleate heterogeneously on borides so that the sharp texture of the weld zone was broken down. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：65 / 70
页数：6
相关论文
共 31 条
[1]  
Appel F, 2011, GAMMA TITANIUM ALUMINIDE ALLOYS: SCIENCE AND TECHNOLOGY, P1, DOI 10.1002/9783527636204
[2]   Nanoscale TiB precipitates in laser deposited Ti-matrix composites [J].
Banerjee, R ;
Genç, A ;
Hill, D ;
Collins, PC ;
Fraser, HL .
SCRIPTA MATERIALIA, 2005, 53 (12) :1433-1437
[3]   Development of crack-free welds in a TiAl-based alloy [J].
Chaturvedi, MC ;
Xu, Q ;
Richards, NL .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2001, 118 (1-3) :74-78
[4]   OXIDATION AND MECHANICAL-BEHAVIOR OF INTERMETALLIC ALLOYS IN THE TI-NB-AL TERNARY-SYSTEM [J].
CHEN, GL ;
SUN, ZQ ;
XING, Z .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1992, 153 (1-2) :597-601
[5]   Crack formation and control upon the electron beam welding of TiAl-based alloys [J].
Chen Guoqing ;
Zhang Binggang ;
Liu Wei ;
Feng Jicai .
INTERMETALLICS, 2011, 19 (12) :1857-1863
[6]   The decomposition of the beta phase in Ti-44Al-8Nb and Ti-44Al-4Nb-4Zr-0.2Si alloys [J].
Cheng, TT ;
Loretto, MH .
ACTA MATERIALIA, 1998, 46 (13) :4801-4819
[7]   The mechanism of grain refinement in TiAl alloys by boron addition - an alternative hypothesis [J].
Cheng, TT .
INTERMETALLICS, 2000, 8 (01) :29-37
[8]   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
[9]  
Clemens H, 2000, ADV ENG MATER, V2, P551, DOI 10.1002/1527-2648(200009)2:9<551::AID-ADEM551>3.0.CO
[10]  
2-U
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