Environmentally assisted cracking of two-phase Fe-Mn-Al alloys in NaCl solution

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02657333· OSTI ID:6208825

Shih, S T; Perng, T P ^[1]; Tsu, I F ^[2]

---

1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China)
2. Univ. of Wisconsin, Madison (United States)

Three two-phase Fe-Mn-Al alloys with nominal compositions, Fe-24Mn-9Al, Fe-27Mn-9Al-3Cr, and Fe-27Mn-9Al-6Cr, were prepared in the solution-treated and cold-rolled conditions. The fractions of ferrite in the solution-treated condition were controlled at 46 to 60 pct, mainly by adjusting the carbon content and the relative amounts of Mn and Al. The ferrite fractions were reduced to 30 to 37 pct after 75 pct deformation by cold-rolling. Specimens were tensile tested at open circuit in aerated 3.5 pct NaCl solution at slow strain rates ranging from 4 x 10[sup [minus]7] to 4 x 10[sup [minus]5] s[sup [minus]1] at room temperature. All of the alloys were quite susceptible to environmentally assisted cracking (EAC). The deformed specimens showed less susceptibility, presumably because the plasticity was already too limited. The EAC appeared to occur at or after the onset of plastic deformation. In this alloy system, the ferritic phase was less resistant to EAC than the austenitic phase, in contrast to the Fe-Cr-Ni stainless steels. The crack propagated preferentially through the ferrite grains or along the ferrite/austenite grain boundaries. The addition of up to 6 pct Cr did not improve the EAC resistance.

• OSTI ID: 6208825
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 24:2; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
FRACTURE PROPERTIES
CHROMIUM ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
AUSTENITE
COLD WORKING
CRACK PROPAGATION
CRACKS
DEFORMATION
EXPERIMENTAL DATA
FERRITE
GRAIN BOUNDARIES
MECHANICAL TESTS
PHASE STUDIES
PLASTICITY
SODIUM CHLORIDES
STRAIN RATE
TENSILE PROPERTIES
ALKALI METAL COMPOUNDS
ALLOYS
CARBON ADDITIONS
CHLORIDES
CHLORINE COMPOUNDS
DATA
FABRICATION
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IRON ALLOYS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL DATA
SODIUM COMPOUNDS
TESTING
360103* - Metals & Alloys- Mechanical Properties