FLEXURAL BENDING FATIGUE TESTING OF
METAL INJECTION MOLDED MATERIALS
METAL INJECTION MOLDING
ABSTRACT
 This report describes the method used by FloMet
LLC for obtaining fatigue data on metal injection molded
(MIM) parts. A sheet metal type molded specimen is used
and tested in the reverse bending mode to failure at a
variety of loads between the yield point and the
endurance limit. A curve of stress vs. number of cycles
is plotted on log paper out to 10 million cycles to
generate an S/N curve for the material. The endurance
limit is compared with the ultimate tensile strength
obtained from small MIMA test bars. The endurance limit
of as-molded and sintered surfaces is tested without
requiring machining of the specimens except for drilling
of the mounting holes.
FATIGUE PROPERTIES OF
MIM Fe-7% Ni AND 17-4PH
METAL INJECTION MOLDING
ABSTRACT
A
Flexural bending fatigue specimen to test metal
injection molding (MIM) alloys is proposed. Two alloys,
17-4PH stainless steel and Fe-7% Ni, are processed into
fatigue and tensile specimens. S/N curves are generated
and compared to relevant mechanical
properties.
FATIGUE STRENGTH OF CASE HARDENED MIM Fe-7% Ni Alloy
METAL INJECTION MOLDING ABSTRACT
The
endurance limit for a case hardened 7% nickel-iron alloy
was measured using a flexural bending fatigue specimen.
The case hardened alloy had an endurance limit that was
almost three times higher than that obtained from the
same alloy in the fully hardened condition.
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