Effect of nanocrystallization on the corrosion resistance of K38G superalloy in CO+CO2 atmospheres

被引：24

作者：

Wang, FH ^{[1
]}

Young, DJ ^{[1
]}

机构：

[1] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

来源：

OXIDATION OF METALS | 1997年 / 48卷 / 5-6期

关键词：

corrosion; CO+CO2; K38G alloy; grain-boundary diffusion;

D O I：

10.1007/BF02153462

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The corrosion resistance of the cast superalloy K38G and a sputtered nanocrystalline coating of the same material was investigated in pure CO in the temperature range 850-1000 degrees C and in CO-20 vol.% CO2 at 900 degrees C. The cast K38G alloy formed Cr2O3 and TiO2 scales, and a zone of internal Al2O3 precipitation. Weight-gain kinetics followed the parabolic rate law under all conditions investigated. The sputtered K38G nanocrystalline coating, however, formed a single-phase Al2O3 scale and no internal-oxidation zone. The parabolic rate constants for nanocrystalline coating oxidation were about one order of magnitude smaller than those of the cast alloy. The changes in reaction morphology and rate are attributed to the more vapid grain-boundary diffusion of aluminum in the nanocrystalline material.

引用

页码：497 / 509

页数：13

共 16 条

[1] DIFFERENCES IN OXIDES ON LARGE-GRAINED AND SMALL-GRAINED 304 STAINLESS-STEEL [J].

BAER, DR ;

MERZ, MD .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1980, 11 (12) :1973-1980

[2] EFFECT OF ALLOY GRAIN-SIZE AND SILICON CONTENT ON THE OXIDATION OF AUSTENITIC FE-CR-NI-MN-SI ALLOYS IN A SO2-O2 GAS-MIXTURE [J].

BASU, SN ;

YUREK, GJ .

OXIDATION OF METALS, 1991, 35 (5-6) :441-469

[3]

GIGGINS CS, 1969, T METALL SOC AIME, V245, P2509

[4]

GRABKE HJ, 1983, WERKST KORROS, V34, P495

[5] MICROSTRUCTURE, ADHESION AND GROWTH-KINETICS OF PROTECTIVE SCALES ON METALS AND ALLOYS [J].

HINDAM, H ;

WHITTLE, DP .

OXIDATION OF METALS, 1982, 18 (5-6) :245-284

[6] OXIDATION MECHANISM OF NI3AL CONTAINING YTTRIUM [J].

KUENZLY, JD ;

DOUGLASS, DL .

OXIDATION OF METALS, 1974, 8 (03) :139-178

[7]

LOU HY, 1992, OXID MET, V38, P299, DOI 10.1007/BF00666917

[8] REHEALING ABILITY OF OXIDE SCALES FORMED ON MICROCRYSTALLINE K38G COATINGS [J].

LOU, HY ;

ZHU, SL ;

WANG, FH .

OXIDATION OF METALS, 1995, 43 (3-4) :317-328

[9] OXIDE FORMATION OF K38G SUPERALLOY AND ITS SPUTTERED MICROGRAINED COATING [J].

LOU, HY ;

WANG, FH ;

ZHU, SL ;

XIA, BJ ;

ZHANG, LX .

SURFACE & COATINGS TECHNOLOGY, 1994, 63 (02) :105-114

[10] Oxidation behavior of sputtered microcrystalline coating of superalloy K17F at high temperature [J].

Lou, HY ;

Tang, YJ ;

Sun, XF ;

Guan, HR .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 207 (01) :121-128

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