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Magneto-mechanical effects in two steels with metastable austenite

Conference ·
OSTI ID:6490226
; ; ; ;
Magneto-mechanical effects, or effects of magnetic fields on mechanical propeties of materials, are reported for two steels containing austenite that undergoes an fcc..-->..bcc martensitic transformation during plastic deformation. Stress-strain curves from tensile tests of AISI 304 stainless steels and 9Ni steels were measured in magnetic fields as large as 18 T at temperatures of 4/sup 0/K, 77/sup 0/K and room temperature. Even in 18 T magnetic fields at cryogenic temperatures the magneto-mechanical effects were small, but they were reproducible and scaled with the strength of the magnetic field and the amount of transformation. Magneto-mechanical effects in steels with metastable austenite provide a unique means of determining how martensitic transformations affect mechanical behavior. The fcc..-->..bcc transformation makes an important contribution to the work hardening of both AISI 304 and 9Ni steel, so the more rapid transformation during magnetic exposure results in a higher strength and a reduced elongation of tensile specimens. In AISI 304 stainless steel a reduced flow stress in the magnetic field was found at small plastic strains.
Research Organization:
Lawrence Berkeley Lab., CA (USA)
DOE Contract Number:
AC03-76SF00098
OSTI ID:
6490226
Report Number(s):
LBL-19233; CONF-850814-29; ON: DE86002865
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITE
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
DEFORMATION
FLOW STRESS
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIC FIELDS
MARTENSITE
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL STEELS
PHASE TRANSFORMATIONS
STAINLESS STEEL-304L
STAINLESS STEELS
STEELS
STRAIN HARDENING
STRESSES