Abstract
Abstract A study was made of the effects of metallurgical and environment variables on stress corrosion cracking (SCC) propagation rates in NiCrMoV turbine disc steels. Constant displacement tests, using wedge-opening-load (WOL) specimens, were performed on steels with yield strengths in the range of 627 to 1124 MPa. One steel was temper-embrittled to study the effect of phosphorus segregation on SCC growth rates. All tests were made at 157 C in either pure water environments, or environments containing common ionic turbine contaminants (NaCl and NaOH) and gaseous turbine contaminants (air, oxygen, and carbon dioxide). Crack growth occurred in all of these environments, although growth rates decreased with increasing environment purity. Estimated field crack growth rates were in close agreement with rates obtained in deaerated pure water. Crack growth was always intergranular, except in aerated pure water, when it was transgranular. Crack growth rates were found to increase with increasing yield strength....
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