Critical cracking potentials of 26Cr-1 Mo ferritic stainless steels in boiling 42% LiCl solution

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3315883· OSTI ID:6973772

Kwon, H S ^[1]; Troiano, A R ^[2]; Hehemann, R F ^[3]

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1. Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusung-gu, Taejon (Korea, Republic of)
2. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Metallurgy and Materials Science
3. Case Western Reserve Univ., Cleveland, OH (United States)

This paper reports that the critical cracking potentials (E[sub cc] for 26Cr-1Mo ferritic stainless steels (UNS S44627), above which stress corrosion cracking (SCC) does occur, have been measured at constant load in a hot chloride solution. Various factors affecting E[sub cc] for the low interstitial 26Cr-1Mo alloy (E-Brite) is shown to be a potential for crack initiation and is determined by the competing rates of generation of new surface by slip-induced film breakdown and repassivation. E[sub cc] for E-Brite is very sensitive to the microstructural conditions developed by prior thermal and mechanical treatments; varying in the range of -485 mV for the mill annealed to -625 mV for the grain coarsened. On the other hand, the minimum potential permitting crack growth is insensitive to these treatments and corresponds to the most active value of E[sub cc] -625 mV. When strained at a constant strain rate (2.5 [times] 10[sup [minus]6]/S), the critical potential above which E-Brite is susceptible to SCC corresponds to the most active value of E[sub cc] measured at constant load. Thus, it appears that the most active value of E[sub cc](-625 mV) is a repassivation potential for growing cracks, and E[sub cc] approaches that for crack propagation as a limiting condition.

• OSTI ID: 6973772
• Journal Information: Corrosion (Houston); (United States), Vol. 48:10; ISSN 0010-9312
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FERRITIC STEELS
CRACKING
STAINLESS STEELS
BOILING
LITHIUM CHLORIDES
PASSIVATION
SOLUTIONS
STRESS CORROSION
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
DECOMPOSITION
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MIXTURES
PHASE TRANSFORMATIONS
PYROLYSIS
STEELS
THERMOCHEMICAL PROCESSES
360105* - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties