Role of nonmetallic inclusions in fatigue, pitting, and corrosion fatigue

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Corrosion

DOI:https://doi.org/10.5006/1.3292108· OSTI ID:201370

Wang, Y; Akid, R ^[1]

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1. Univ. of Sheffield (United Kingdom). Dept. of Mechanical and Process Engineering

A study was conducted of the effect of nonmetallic inclusions on the fatigue and corrosion fatigue resistance of a high-strength steel in 0.6 M sodium chloride (NaCl) solutions, Results indicated that angular calcium-aluminate inclusions played an important role in introducing cracks during air fatigue cycling; however, sulfide inclusions appeared to be the main contributors to sites for corrosion pits and subsequent crack initiation. Conventional consideration based on the stress intensification caused by such defects was insufficient to describe the role of nonmetallic inclusions in fatigue crack development in air and by corrosion pits during corrosion fatigue. However, it was considered that the interaction between geometric discontinuities (i.e., nonmetallic inclusions and cyclic loading) resulted in plasticity localization and, thus, facilitated crack development. Similarly, enhancement of localized dissolution resulting from plasticity localization contributed to corrosion pit development at nonmetallic inclusion sites, thus promoting early crack development when a corrosive environment was presented.

• Sponsoring Organization: USDOE
• OSTI ID: 201370
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 2 Vol. 52; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
CALCIUM COMPOUNDS
CATALYTIC EFFECTS
CORROSION FATIGUE
CORROSIVE EFFECTS
CRACK PROPAGATION
FATIGUE
INCLUSIONS
PITTING CORROSION
SODIUM CHLORIDES
STEELS
STRESS INTENSITY FACTORS
SULFIDES