09303 The Effect of Cold Working on the Corrosion Fatigue Behaviour of a CrNiMoN Austenitic Stainless Steel

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Product Number: 51300-09303-SG

ISBN: 09303 2009 CP

Author: Gregor Mori, Robert Sonnleitner, Rainer Fluch and Michael Panzenboeck

Publication Date: 2009

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Previous corrosion fatigue investigations of a high alloyed solution annealed superaustenitic CrNiMoN stainless steel have shown that the fatigue strength in 62% CaCl2 solution at 120°C compared to glycerin at the same temperature is slightly decreased. In this paper, a 27% cold deformed steel with the same chemical composition has been investigated and results are compared to the solution annealed condition. Stress versus number of cycles curves were recorded in glycerine, as a reference medium, and in 62% CaCl2 solution, both at a temperature of 120°C. The stress ratio (R) was 0.05 to avoid destruction of the fracture surfaces. The testing frequency was 20 Hz. The fracture surfaces of representative specimens which failed at high and low stress levels were investigated by scanning electron microscopy and evaluated as function of the medium, applied stress and different cold deformation degrees of the stainless steel. The effect of cold deformation from the CrNiMoN stainless steel on crack initiation and propagation is discussed. In addition, constant load tests, exposure tests and electrochemical tests were performed.

Keywords: corrosion fatigue, stainless steel, high nitrogen steel, austenite, fracture surface