Abstract
The effects of long range order, test temperature, and test environment on fatigue crack growth of two (Fe, Ni)3 V-type ordered alloys have been determined. Long range order suppressed crack growth at low and intermediate δK, but had less effect at high δK. Crack growth resistance of the ordered alloys decreased at 600 ‡C, but still compared favorably to that of several commercial high temperature alloys. Crack growth resistance of ordered material was decreased in the presence of hydrogen (precharged or gaseous), accompanied by a change in fracture path from transgranular to intergranular. Disordered material was nearly unaffected by hydrogen. The effects of long range order and hydrogen exposure on crack growth rates are discussed in terms of the characteristic superlattice dislocations in ordered alloys.
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