Type of Document	Dissertation
Author	Wilson, James Harris
URN	etd-02062013-040204
Title	The effect of hydrogen on the fatigue life of high strength steel.
Degree	PhD
Department	Engineering Science and Mechanics
Advisory Committee	Advisor Name Title McNitt, R. P. Committee Chair Mabie, Hamilton H. Committee Member Padis, L. A. Committee Member Pap, A. A. Committee Member Stinchcomb, Wayne W. Committee Member
Keywords	Steel
Date of Defense	1978-08-05
Availability	restricted
Abstract 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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