Localized corrosion and stress corrosion cracking behavior of austenitic stainless steel weldments containing retained ferrite. Annual progress report, June 1, 1979-March 31, 1980

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Localized corrosion and stress corrosion cracking experiments were performed on single phase 304 stainless steel alloys and autogeneous weldments containing retained delta ferrite as a second phase. The results of the pitting experiments show that the presence of delta ferrite decreases localized corrosion resistance with pits initiating preferentially at delta ferrite-gamma austenite interphase boundaries. This increased susceptibility is reversible with elevated temperature heat treatments which revert the metastable ferrite phase to the equilibrium austenite phase. Experiments have also been conducted as functions of surface preparation, pH, Cl/sup -/ concentration and temperatures from 20/sup 0/C to 290/sup 0/C. These experiments indicate ... continued below

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Pages: 9

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Savage, W. F. & Duquette, D. J. March 1, 1980.

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Localized corrosion and stress corrosion cracking experiments were performed on single phase 304 stainless steel alloys and autogeneous weldments containing retained delta ferrite as a second phase. The results of the pitting experiments show that the presence of delta ferrite decreases localized corrosion resistance with pits initiating preferentially at delta ferrite-gamma austenite interphase boundaries. This increased susceptibility is reversible with elevated temperature heat treatments which revert the metastable ferrite phase to the equilibrium austenite phase. Experiments have also been conducted as functions of surface preparation, pH, Cl/sup -/ concentration and temperatures from 20/sup 0/C to 290/sup 0/C. These experiments indicate that pitting tendency for both single phase and two phase alloys is controlled by the physical properties of the passive films which are naturally forced. The results of the SCC experiments have shown that, for two phase alloys at temperatures from 20/sup 0/C to 290/sup 0/C, the ferrite phase also significantly affects stress corrosion resistance. At low temperatures and low pH the ferrite phase is preferentially dissolved, while at intermediate temperatures and pH's the delta/..gamma.. interface is the preferred crack path. At high temperatures cracking is associated with pitting, and depends sensitively on 0/sub 2/ concentration of the environment. Additionally, the addition of SO/sub 4//sup =/ to chloride containing environments has a marked inhibitive effect on SCC.

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Pages: 9

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Dep. NTIS, PC A02/MF A01.

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  • Report No.: COO-2462-6
  • Grant Number: AS02-76ER02462
  • DOI: 10.2172/5394115 | External Link
  • Office of Scientific & Technical Information Report Number: 5394115
  • Archival Resource Key: ark:/67531/metadc1069703

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  • March 1, 1980

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 26, 2018, 8:35 p.m.

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Savage, W. F. & Duquette, D. J. Localized corrosion and stress corrosion cracking behavior of austenitic stainless steel weldments containing retained ferrite. Annual progress report, June 1, 1979-March 31, 1980, report, March 1, 1980; Troy, New York. (digital.library.unt.edu/ark:/67531/metadc1069703/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.