Environment-assisted cracking of Fe-32% Mn-9% Al alloys in 3.5% sodium chloride solution

Journal Article · Mon May 01 04:00:00 EDT 1995 · Corrosion

DOI:https://doi.org/10.5006/1.3293605· OSTI ID:46081

Chang, S C; Liu, J Y ^[1]; Juang, H K ^[2]

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1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering
2. Chung Shan Inst. of Science and Technology, Taoyuan (Taiwan, Province of China). Materials Research and Development Center

The stress corrosion cracking (SCC) behavior of four austenitic Fe-32% Mn-9% Al alloys containing {approx} 1 wt% carbon was studied. All of the four alloys were susceptible to SCC in room temperature and 160 C NaCl solution. SCC was enhanced by applying an anodic potential. The crack path was transgranular, and cleavage-like regions were observed on the fracture surface. The corrosion-assisted microcleavage model proposed for the transgranular SCC behavior of face-centered cubic (fcc) materials very likely was the operating SCC mechanism of the austenitic Fe-Mn-Al alloys. Adding 1.23% Mo or 1.27% Si to the austenitic Fe-32% Mn-9% Al alloys did not change the SCC mechanism and crack paths. Adding 1.27% Si made the alloys more susceptible to SCC, but no such effect was observed with the addition of 1.23% Mo. All four alloys studied were susceptible to hydrogen embrittlement (HE) in 3.5% NaCl solution at large cathodic applied potentials, and the crack paths were intergranular. The addition of Mo, Cr, or Si in the alloy displaced the potential at which HE occurred to more cathodic values.

• Sponsoring Organization: USDOE
• OSTI ID: 46081
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 5 Vol. 51; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CARBON ADDITIONS
CHROMIUM
CORROSIVE EFFECTS
CRACK PROPAGATION
HYDROGEN EMBRITTLEMENT
IRON BASE ALLOYS
MANGANESE ALLOYS
MATHEMATICAL MODELS
METALLURGICAL EFFECTS
MOLYBDENUM
SILICON
SODIUM CHLORIDES
STRESS CORROSION