Nickel alloys combat high-temperature corrosion

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Advanced Materials and Processes

OSTI ID:131417

Agarwal, D C ^[1]; Herda, W R; Brill, U ^[2]

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1. VDM Technologies Corp., Houston, TX (United States)
2. Krupp-VDM GmbH, Werdohl (Germany)

During the last few decades, a better understanding of alloying effects, advances in melting technology, and the development of controlled thermomechanical processing have led to new and improved high-temperature alloys. Most such alloys have sufficient amounts of chromium (with or without additions of aluminum or silicon) to form chromium oxide, alumina, and/or silica protective oxide scales, which provide resistance to environmental degradation. However, oxides cannot protect against failure by creep, mechanical or thermal fatigue, thermal shock, or embrittlement. In the real world, failure is typically caused by a combination of two or more attack modes, which synergistically accelerate degradation. To counter these attacks, two new nickel-base alloys have been developed, in which high-temperature corrosion resistance has been optimized by the careful addition of elements such as chromium, aluminum, silicon, and rare earths. They provide economical and reliable solutions to attack by oxygen, sulfur, halogens, carbon compounds, and nitrogen in a range of high-temperature applications. For example, Alloy 602CA is utilized in heat treating equipment, catalytic automotive parts, and chemical processing apparatus. Alloy 45TM has been successfully used in coal gasification equipment, incinerators, refineries, and process machinery involving severe sulfidizing conditions.

• OSTI ID: 131417
• Journal Information: Advanced Materials and Processes, Journal Name: Advanced Materials and Processes Journal Issue: 4 Vol. 148; ISSN 0882-7958; ISSN AMAPEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBURIZATION
CHEMICAL COMPOSITION
CORROSION RESISTANCE
CREEP
HALOGENATION
MECHANICAL PROPERTIES
NICKEL BASE ALLOYS
OXIDATION
OXIDES
RARE EARTHS
SCALING
SULFIDATION
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES