Abstract
The plane-strain stress corrosion thresholdK Iscc and fatigue crack growth rate have been determined for a high strength martensitic stainless steel, AFC 77, in both conventionally processed and strain-aged conditions. TheK Iscc (in 3.5 pct sodium chloride solution) is markedly affected by both the tempering temperature and the degree of strain aging. The highestK Iscc of 105 ksi $$\sqrt {in} $$ . was obtained by tempering at 500°F and the lowestK Iscc of 10 ksi $$\sqrt {in} $$ . by tempering at 1100°F. Retained austenite raisedK Iscc at tempering temperatures up to 1000°F, which was the highest tempering temperature at which austenite could be maintained. Fatigue crack growth rates in both dry air (<10pct relative humidity) and 3.5 pct sodium chloride solution were at a maximum for material tempered at 700°F. Over the range of stress intensity studied, retained austenite reduced fatigue crack growth rate in salt solution but increased it in dry air.
Published Version
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