Low cycle fatigue behavior of spinodally decomposed Fe-26Cr-1Mo alloys

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5309358

Park, Kyungho; LaSalle, J C; Schwartz, H ^[1]

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1. Northwestern Univ., Evanston, IL (USA)

The low cycle fatigue of spinodally decomposed Fe-26Cr-1Mo high purity ferritic stainless steel was studied in comparison with the solution treated homogeneous state under constant plastic strains and strain rates at room temperature. Correlation between cyclic softening and the demodulation of composition waves was examined by small angle neutron scattering (SANS). Surface and dislocation microstructures were investigated by optical microscopy and TEM. The cyclic stress response was quite different between as-quenched and aged materials. Aged materials showed hardening for the first few cycles followed by softening, reaching a minimum point and hardening again, whereas as-quenched materials showed only hardening throughout the test. SANS and TEM observation suggest that the cyclic softening mechanisms observed is similar to that seen in FCC spinodal alloys.

• OSTI ID: 5309358
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AGE HARDENING
AGING
ALLOYS
CHROMIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISLOCATIONS
ELECTRON MICROSCOPY
FATIGUE
FCC LATTICES
FERRITIC STEELS
HARDENING
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
OPTICAL MICROSCOPY
QUENCHING
SCATTERING
STAINLESS STEELS
STEELS
STRAIN RATE
STRAIN SOFTENING
TRANSMISSION ELECTRON MICROSCOPY