Abstract
The fatigue crack growth rates of material A (iron base alloy A286), material M (austenitic stainless steel 12Cr-12Ni-10Mn-5Mo) and material S (austenitic stainless steel SUS304L) were investigated experimentally. The fatigue tests were conducted with compact specimens at cryogenic temperatures (4 and 77K) and room temperature.
The results obtained were as follows.
(1) For materials A, M and S, the crack growth rates at 4 and 77K were lower than that at room temperature. However, the temperature dependence of the crack growth rate was different among the three materials and no clear tendency was observed.
(2) At 4K, the crack growth rate of material A was lower than that of material M or S.
(3) The crack growth rates at 4K of materials A, M, S, titanium alloy and aluminum alloy were related to the strain intensity factor range ΔK/E.
(4) For materials A and M, a good correspondence between the striation spacing and the crack growth rate was observed in the crack growth rate range of 10-4-10-3mm/cycle, irrespective of test temperatures.
