Title page for ETD etd-02062013-040204
|Type of Document
||Wilson, James Harris
||The effect of hydrogen on the fatigue life of high strength steel.
||Engineering Science and Mechanics
|McNitt, R. P.
|Mabie, Hamilton H.
|Padis, L. A.
|Pap, A. A.
|Stinchcomb, Wayne W.
|Date of Defense
Torsional fatigue tests were conducted on 437O steel oil quenched
and tempered at lOOO° F in (l) the uncharged state, (2) the hydrogen
charged state, and (3) in a hydrogen environment. The tests were conducted
on both smooth (Kt = l.l) and V-notch (Kt = 3.8) test specimens.
A statistical analysis conducted at the 99% confidence limit for the
smooth test specimens indicated that precharging with hydrogen increased
the fatigue life of the material and also the fracture surface of the
test specimens changed from a circumferential crack to a 45° diagonal
crack. At a 90% confidence limit, charging with hydrogen did not affect
the fatigue life of the V-notched specimens. At a 99% confidence limit
for both the smooth and V-notched test specimens, testing in a hydrogen
environment increased the fatigue life of the material.
Bending fatigue tests were also conducted on the same material and
the results indicated that charging with hydrogen decreased fatigue life
of smooth test specimens (Kt = l.l) but increased the fatigue life for
V-notched specimens (Kt = 2.4 and 3.8).
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