Grain boundary composition effects on environmentally induced cracking of engineering materials. [SCC of austenitic stainless steel; HE of NiCrMoV low-alloy steel]

Conference · Mon Sep 01 00:00:00 EDT 1986

OSTI ID:6810965

Bruemmer, S M

There is now clear evidence that intergranular stress corrosion cracking (SCC) and hydrogen embrittlement (HE) of engineering materials depend on grain boundary composition. Two examples are used to illustrate this interrelationship: (1) SCC of austenitic stainless steel in high-temperature water and (2) HE of NiCrMoV rotor steels in acidic solutions. Grain boundary compositions are characterized by analytical electron microscopy and scanning Auger electron spectroscopy. Environmental cracking susceptibility is indicated by slow-strain-rate tests in appropriate aqueous environments. Direct correlations are documented between measured grain boundary compositions and environmental cracking. The ability to establish these types of correlations enables diagnosis of embrittlement susceptibility and helps identify methods to control or eliminate embrittlement by bulk chemistry or processing modifications. 7 figs., 3 tabs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6810965
• Report Number(s): PNL-SA-14370; CONF-870314-9; ON: DE87006405
• Resource Relation: Conference: Corrosion '87, San Francisco, CA, USA, 9 Mar 1987; Other Information: Microfiche only, copy does not permit paper copy reproduction
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STAINLESS STEELS
GRAIN BOUNDARIES
INTERGRANULAR CORROSION
STRESS CORROSION
STEELS
HYDROGEN EMBRITTLEMENT
CHEMICAL COMPOSITION
CORRELATIONS
FRACTURE PROPERTIES
ROTORS
SEGREGATION
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
360105* - Metals & Alloys- Corrosion & Erosion