Effects of rising and falling stress intensity factor (K) profiles on the stress corrosion cracking (SCC) growth rates of stainless steel and nickel alloys has been studied in high-temperature water. Sophisticated test control software was used that changes loading (P) based on crack length (a) to achieve a specific K trajectory by controlling dK∕da⁠, not simply dP∕dt⁠. The majority of SCC problems develop adjacent to welds, which have a complex residual stress profile versus wall thickness. This, coupled with the dependence of K on crack length, causes K to change as the crack grows, not per se with time (t)⁠. The effect of the rate of change in K on crack tip strain rate and the associated crack growth rate is discussed, along with the repercussions to understanding and dispositioning SCC response.

Issue Section:
Research Papers
Keywords:
stainless steel, fission reactor materials, nickel alloys, stress corrosion cracking, internal stresses, crack-edge stress field analysis
Topics:
Fracture (Materials), Stainless steel, Stress, Water, High temperature, Alloys
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