Influences of Boron Concentration and Cooling Rate on Structure of TiAl Alloy Crisscross Casting

被引：0

作者：

Yang Lili ^{[1
]}

Zheng Lijing ^{[1
]}

Zhang Hu ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2011年 / 40卷 / 09期

关键词：

TiAl based alloy; cooling rate; grain size; boride; GRAIN-REFINEMENT;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ti-47Al-2Cr-2Nb-xB (x=0, 0.15, 0.8, 1.5) (at%) crisscross casting with different thickness (2, 5, 10 and 20 mm) were prepared by a vacuum induction skull furnace. Influences of the cooling rate and the boron concentration on the boride shape and the grain size of the casting were studied by means of stereo microscope and scanning electron microscopy (SEM). The results show that the higher boron concentration and the faster cooling rate lead to smaller grain size. Waved-flake borides change into stick- or plate-like ones when the boron concentration increases. Boride size of Ti-47Al-2Cr-2Nb-0.8B casting is reduced with the cooling rate decreasing, but the change of boride size of Ti-47Al-2Cr-2Nb-0.15B and Ti-47Al-2Cr-2Nb-1.5B casting is unobvious.

引用

页码：1565 / 1569

页数：5

共 9 条

[1] The mechanism of grain refinement in TiAl alloys by boron addition - an alternative hypothesis
Cheng, TT
[J]. INTERMETALLICS, 2000, 8 (01) : 29 - 37
[2] Grain refinement by low boron additions in niobium-rich TiAl-based alloys
Hecht, U.
Witusiewicz, V.
Drevermann, A.
Zollinger, J.
[J]. INTERMETALLICS, 2008, 16 (08) : 969 - 978
[3] Effect of boron addition on tensile ductility in lamellar TiAl alloys
Hu, D
[J]. INTERMETALLICS, 2002, 10 (09) : 851 - 858
[4] Effect of composition on grain refinement in TiAl-based alloys
Hu, D
[J]. INTERMETALLICS, 2001, 9 (12) : 1037 - 1043
[5] EVOLUTION OF BORIDE MORPHOLOGIES IN TIAL-B ALLOYS
HYMAN, ME
MCCULLOUGH, C
LEVI, CG
MEHRABIAN, R
[J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1991, 22 (07): : 1647 - 1662
[6] Li SJ, 2004, RARE METAL MAT ENG, V33, P144
[7] RAO GB, 2004, CHINESE J NONFERROUS, V14, P2
[8] [孙涛 SUN Tao], 2009, [材料热处理学报, Transactions of Materials and Heat Treatment], V30, P96
[9] An analysis of the lamellar transformation in TiAl alloys containing boron
Zhang, WJ
Deevi, SC
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 337 (1-2): : 17 - 20

← 1 →