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
收藏
页码：6140 / 6152
页数：13
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