Homogeneity of Composition and Structure for High Nb Containing TiAl Alloy Ingots Prepared by Vacuum Levitation Melting

被引：0

作者：

Zhang Zhiyong ^{[1
]}

Xu Xiangjun ^{[1
]}

Hao Guojian ^{[1
]}

Zhang Laiqi ^{[1
]}

Lin Junpin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2014年 / 43卷 / 12期

关键词：

vacuum levitation melting; high-Nb TiAl ingots; metallurgical quality; oxygen content; GRAIN-REFINEMENT; GAMMA; MICROSTRUCTURE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Metallurgical quality of high Nb containing TiAl ingots prepared by vacuum levitation melting (VLM) has been investigated from respects of macroscopic defects, composition distribution, oxygen content and microstructure. After twice melting and pouring the melting into properly designed mould, crack-free ingots with small shrinkage defects could be obtained. There are Al macrosegregation (>1at%) at different positions of ingots. Oxygen content is decreased to 300 mg/kg by using high quality raw materials and a optimized melting process. There are not phases and microstructures induced by high melting point raw materials in the ingot, and the as-cast microstructures of the ingots are typically nearly lamellar microstructure.

引用

页码：3063 / 3067

页数：5

共 14 条

[1] Chen GL, 1999, GAMMA TITANIUM ALUMINIDES 1999, P371
[2] Chen YY, 2009, RARE METAL MAT ENG, V38, P554
[3] The decomposition of the beta phase in Ti-44Al-8Nb and Ti-44Al-4Nb-4Zr-0.2Si alloys
Cheng, TT
Loretto, MH
[J]. ACTA MATERIALIA, 1998, 46 (13) : 4801 - 4819
[4] Grain refinement in beta-solidifying Ti44Al8Nb1B
Hu, D.
Yang, C.
Huang, A.
Dixon, M.
Hecht, U.
[J]. INTERMETALLICS, 2012, 23 : 49 - 56
[5] Effect of composition on grain refinement in TiAl-based alloys
Hu, D
[J]. INTERMETALLICS, 2001, 9 (12) : 1037 - 1043
[6] Alloy design concepts for refined gamma titanium aluminide based alloys
Imayev, R. M.
Imayev, V. M.
Oehring, M.
Appel, F.
[J]. INTERMETALLICS, 2007, 15 (04) : 451 - 460
[7] Microstructure refinement of cast TiAl alloys by β solidification
Jin, YG
Wang, JN
Yang, J
Wang, Y
[J]. SCRIPTA MATERIALIA, 2004, 51 (02) : 113 - 117
[8] EFFECT OF PURITY AND SECOND-PHASE ON DUCTILITY OF TIAL
KAWABATA, T
TADANO, M
IZUMI, O
[J]. SCRIPTA METALLURGICA, 1988, 22 (11): : 1725 - 1730
[9] Lin Junpin, 2010, MAT CHINA, V9, P1
[10] Solidification structure in a cast γ alloy
Singh, AK
Muraleedharan, K
Banerjee, D
[J]. SCRIPTA MATERIALIA, 2003, 48 (06) : 767 - 772

← 1 2 →