Cold work accelerates SCC growth rates in Alloy 600. A study was performed to systematically evaluate the effect of cold work on Alloy 600 as a function of temperature, amount of cold work, stress intensity factor, and processing orientation. Crack growth rates were determined between 252 and 360°C, stress intensity factors between 21 and 55 MPa√m, and yield strengths between 201 and 827 MPa. The material with the highest yield strength was cold rolled and tested in the longitudinal-transverse (LT) and short-transverse (ST) orientations. Crack growth rates were a strong function of the processing orientation in cold rolled plate, with growth rates being approximately an order of magnitude greater in the ST orientation compared to the LT orientation. Crack growth rates in the LT orientation were measured between 0.003 and 1.95 x 10-9 m/s and between 0.066 and 6.3 x 10-9 m/s in the ST orientation. The results of this study demonstrate that although cold work can be used to accelerate SCC, the orientation of crack growth can significantly affect the results, and must be taken into account when analyzing data from cold worked material.

Subject
Crack growth, Materials, Carbides, Intergranular stress corrosion cracking, Stress intensity, Fracture surfaces, Activation energy, Fatigue crack growth rate, Grain boundary, Alloys, Grain, Yield strength, Stress corrosion cracking
Keywords:
stress corrosion cracking, Alloy 600, cold work, orientation
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1999
GOV
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