The effects of melting technologies on the microstructures and properties of Nb-16Si-22Ti-2Al-2Hf-17Cr alloy

被引：40

作者：

Li, Xiaojian ^{[1
]}

Chen, Haifeng ^{[1
]}

Sha, Jiangbo ^{[1
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 23期

关键词：

Nb-Si based alloys; Induction melting; Induction skull melting; Microstructure; Mechanical property; Oxidation resistance; IN-SITU COMPOSITES; MECHANICAL-PROPERTIES; SILICIDE;

D O I：

10.1016/j.msea.2010.04.046

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper deals with the effects of vacuum non-consumable arc-melting (VCAM), vacuum induction melting (VIM) and induction skull melting (ISM) technologies on microstructures, mechanical properties and oxidation resistance of Nb-16Si-22Ti-2Al-2Hf-17Cr alloy. It is revealed that the microstructure of the Nb-16Si-22Ti-2Al-2Hf-17Cr alloy is composed of Nb solid solution (Nb,Ti)(ss), silicide (Nb,Ti)(5)Si-3 and Laves phase NbCr2. The ISM ingots exhibit the finest microstructure, while the VCAM ingot shows the coarsest microstructure. Refined at 1800 degrees C for 10 min, the VIM ingot with a 0.1% carbon addition shows the best room temperature toughness of 9.05 MPa m(1/2) on average, however, the highest strength at 1250 degrees C was obtained on the ISM sample refined at technology parameters of 140 kw melting for 2 min + 160 kw melting for 3 min. In addition, oxidation resistance was greatly improved through the ISM technology compared with the VCAM technology. (C) 2010 Published by Elsevier B.V.

引用

页码：6140 / 6152

页数：13

共 19 条

[1]

*ASTM, 1983, ASTM STP E, V399, P488

[2]

Bewlay B.P., 2001, INTERMETALLIC COMPOU, V3, P541

[3] The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-based in situ composite [J].

Bewlay, BP ;

Jackson, MR ;

Lipsitt, HA .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1996, 27 (12) :3801-3808

[4] Processing high-temperature refractory-metal silicide in-situ composites [J].

Bewlay, BP ;

Jackson, MR ;

Subramanian, PR .

JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY, 1999, 51 (04) :32-36

[5] A review of very-high-temperature Nb-silicide-based composites [J].

Bewlay, BP ;

Jackson, MR ;

Zhao, JC ;

Subramanian, PR .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (10) :2043-2052

[6]

BEWLAY BP, 1997, JOM, V49, P46

[7] Microstructures and mechanical properties of directionally solidified Nb-xMo-22Ti-18Si in-situ composites [J].

Hirai, H ;

Tabaru, T ;

Ueno, H ;

Kitahara, A ;

Hanada, S .

JOURNAL OF THE JAPAN INSTITUTE OF METALS, 2000, 64 (06) :474-480

[8]

Jackson M. R., 1995, High-Temperature Ordered Intermetallic Alloys VI. Symposium, P1339

[9]

JACKSON MR, Patent No. 6419765

[10]

LIVINGSTON JD, 1994, MATER RES SOC SYMP P, V322, P395

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