Cyclic oxidation behaviour of a Ni-Mo-Cr alloy at 800°C

被引:7
作者
Ul-Hamid, A [1 ]
Tawancy, HM
Mohammed, AI
Al-Jaroudi, SS
Abbas, NM
机构
[1] King Fahd Univ Petr & Minerals, Engn Res Ctr, Res Inst, Dhahran 31261, Saudi Arabia
[2] Saudi Aramco, Tanajib, Saudi Arabia
关键词
alloys; oxidation resistance; temperature;
D O I
10.1108/00035590410554900
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The oxidation behaviour of a wrought Ni-Mo-Cr alloy was studied under thermal cyclic conditions in air at 800degreesC for exposure periods of up to 1,000 h. The morphologies, microstructures and compositions of the oxide scales were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Oxidation kinetics were determined by weight gain measurements. Results show that steady-state oxidation was achieved within 1 h of exposure while partial scale spalling was observed after 400 h. The alloy grain boundaries intersecting the alloy surface showed preferential oxidation. They became depleted in Ni and enriched in Mo and Cr during transient oxidation. The scale initially formed at the surface was NiO which grew outwardly and laterally to cover the entire alloy. Upon continued oxidation, the scale developed into an outer NiO layer and an inner Cr2O3 layer while the presence of NiMoO4 was also observed within the scale.
引用
收藏
页码:339 / 347
页数:9
相关论文
共 9 条
[1]   Microstructural characterization of Haynes® 242™ alloy [J].
Miller, MK ;
Anderson, IM ;
Pike, LM ;
Klarstrom, DL .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 327 (01) :89-93
[2]  
ROTHMAN MF, 1989, WORLD AEROSPACE PROF, P121
[3]  
ROTHMAN MF, 1991, ACHEMA FRANKF GERM
[4]  
ROTHMAN MF, 1991, 91GT14 AM SOC MECH E
[5]  
SRIVASTAVA SK, 1990, HIGH TEMPERATURE MATERIALS FOR POWER ENGINEERING 1990, PTS 1 AND 2, P1357
[6]  
SRIVASTAVA SK, 1992, SUPERALLOYS 1992, P227
[7]  
SRIVASTAVA SK, 1989, 89GT329 AM SOC MECH
[9]  
Tendeloo G.V., 1975, PHYS STATUS SOLIDI A, V27, P457