Download or read book Localized Corrosion and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments Containing Retained Ferrite Annual Progress Report June 1 1979 March 31 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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− concentration and temperatures from 20°C to 290°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°C to 290°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 02 concentration of the environment. Additionally, the addition of SO4/sup =/ to chloride containing environments has a marked inhibitive effect on SCC.

Download or read book Localized Corrosion and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments Containing Retained Ferrite Annual Progress Report June 1 1978 March 31 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Localized corrosion and stress corrosion cracking experiments have been 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 pressure 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.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Localized Corrosion and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments Containing Retained Ferrite Annual Progress Report June 1 1977 March 31 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Localized corrosion (pitting) experiments have been performed on single-phase austenitic 304 stainless steels and on duplex 304 steels containing 6 to 8% retained delta ferrite as a result of rapid solidification (welding). Experimental variables included thermomechanical treatment, solution pH, chloride concentration and solution temperature.

Download or read book Corrosion Abstracts written by and published by . This book was released on 1981 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Localized Corrosion and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments written by W. F. Savage and published by . This book was released on 1978 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pitting and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments Containing Retained Ferrite Progress Report June 1 1974 May 31 1975 written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pitting and Stress Corrosion Cracking Behavior of Austenitic Stainless Steel Weldments Containing Retained Ferrite Technical Progress Report No 2 June 1 1975 May 31 1976 written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The critical pH for pitting protection is 8.5 for weld metal, 11.5 for as-received 304L ss. Re-passivation potentials measured using potentiokinetic scanning and after long-term testing were found not to be reproducible and accurate. Slow-strain-rate stress corrosion cracking (SCC) tests of as-received and welded 304L and 304 ss were conducted in boiling MgCl2 solutions. The decreased strain rate led to increased SCC, with the threshold being at 4 x 10−5s−1. 304L ss exhibited intergranular failure below 135°C and transgranular failure at 154°C. A specimen containing a transverse weld failed in the heat affected zone when tested in liquid paraffin; in boiling MgCl2, the failure occurred in the fusion zone. In boiling saturated NaCl, SCC occurred in as-received ss only at pH less than 2.5 and slowest strain rate, and in weld metal only at pH less than 1.0 and slowest strain rate, but H2SO4 or HCl + NaCl induces susceptibility. (DLC).

Download or read book INIS Atomindex written by and published by . This book was released on 1980 with total page 1522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavior Society written by and published by . This book was released on 1980 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1983 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Corrosion Cracking of Austenitic Stainless Steel written by McIntyre R. Louthan and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Alloys Index written by and published by . This book was released on 1981 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Corrosion and Stress Corrosion Cracking Behavior of Stainless Steel Weldments Containing Ferrite written by Donald H. Sherman and published by . This book was released on 1973 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Corrosion Cracking of Austenitic Stainless Steel Core Internal Welds written by and published by . This book was released on 1999 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructural analyses by several advanced metallographic techniques were conducted on austenitic stainless steel mockup and core shroud welds that had cracked in boiling water reactors. Contrary to previous beliefs, heat-affected zones of the cracked Type 304L, as well as 304 SS core shroud welds and mockup shielded-metal-arc welds, were free of grain-boundary carbides, which shows that core shroud failure cannot be explained by classical intergranular stress corrosion cracking. Neither martensite nor delta-ferrite films were present on the grain boundaries. However, as a result of exposure to welding fumes, the heat-affected zones of the core shroud welds were significantly contaminated by oxygen and fluorine, which migrate to grain boundaries. Significant oxygen contamination seems to promote fluorine contamination and suppress thermal sensitization. Results of slow-strain-rate tensile tests also indicate that fluorine exacerbates the susceptibility of irradiated steels to intergranular stress corrosion cracking. These observations, combined with previous reports on the strong influence of weld flux, indicate that oxygen and fluorine contamination and fluorine-catalyzed stress corrosion play a major role in cracking of core shroud welds.

Download or read book A Study of Stress corrosion Cracking in Stainless Steel Weldments Containing Ferrite written by William A. III. Baeslack and published by . This book was released on 1978 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: