Download or read book Hydrogen Assisted Fracture of Sensitized Type 304L Austenitic Stainless Steel written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sensitized specimens of Type 304L stainless steel were tensile tested in atmospheres of hydrogen and helium at high pressure, and in air at ambient pressure. Comparison tensile tests were made with solution-annealed specimens of Type 304L stainless steel in the same atmosphere. When both specimens were tested in high-pressure hydrogen, the sensitized specimens had greater loss in ductility and increased tendency to intergranular fracture. For the sensitized specimens, plastic strain to failure (epsilon/sub p/ = 1n A0/A/sub f/) in hydrogen at 69 MPa was reduced by 60 to 70% in comparison to similar tests in helium. In addition, a notch with a stress concentration factor of about 3 reduced plastic strain an additional 50 to 60%. In all cases, the nominal tensile strength of Type 304L stainless steel was increased by the notch. There was no evidence of intergranular failure in notched specimens of solution-annealed Type 304L stainless steel tested in high-pressure hydrogen environments.

Download or read book HYDROGEN ASSISTED FRACTURE IN FORGED TYPE 304L AUSTENITIC STAINLESS STEEL written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Austenitic stainless steels generally have good resistance to hydrogen-assisted fracture; however, structural designs for high-pressure gaseous hydrogen are constrained by the low strength of this class of material. Forging is used to increase the low strength of austenitic stainless steels, thus improving the efficiency of structural designs. Hydrogen-assisted racture, however, depends on microstructural details associated with manufacturing. In this study, hydrogen-assisted fracture of forged type 304L austenitic stainless steel is investigated. Microstructural variation in multi-step forged 304L was achieved by forging at different rates and temperatures, and by process annealing. High internal hydrogen content in forged type 304L austenitic stainless steel is achieved by thermal precharging in gaseous hydrogen and results in as much as 50% reduction of tensile ductility.

Download or read book Hydrogen induced Cleavage Fracture of Type 304L Austenitic Stainless Steel written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Type 304L stainless steel supersaturated with hydrogen gas fails in tension at 200 to 250°K by brittle fracture. Fracture surfaces exhibit isolated facets oriented 0 to 30° to the tensile axis and have characteristics of cleavage fracture. The threefold symmetry of Laue back reflection photographs and trace analysis of deformation bands on the facets demonstrate that cleavage is along (111) planes. The fracture paths were identified as coherent twin boundaries on polished sections through facets and on microcracks across interior grains. Although cleavage fracture is not commonly observed in alloys with a face-centered cubic (FCC) lattice, these observations for Type 304L stainless steel and similar observations on Nitronic-40 and Tenelon demonstrate that cleavage is possible under some circumstances in austenitic steels.

Download or read book Mechanism for Hydrogen induced Brittle Fracture of Austenitic Stainless Steels written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal hydrogen embrittlement of several austenitic stainless steels is known to be accompanied by a change in fracture mode. Type 304L stainless steel is representative of these alloys. In other austenitic stainless steels, Type 310 for example, no change in fracture mode has been reported and gas phase charging of the alloy causes little change in strength or ductility. Cathodic charging, however, introduces extremely large amounts of hydrogen and ductility losses are observed. The embrittlement mechanism proposed in this paper for Type 304L stainless steel and similar alloys is based on results of a continuing program to investigate hydrogen embrittlement of austenitic stainless steels. The proposed mechanism, therefore, is tentative insofar as future results may contradict current beliefs or permit a more definitive mechanism to be developed. One central notion of this proposal is that of microcrack formation. The present fracture model envisions the nucleation step as taking place via a Zener--Stroh--Petch mechanism rather han a Cottrell coalescence model as proposed by Blanchard and Troiano.

Download or read book Hydrogen Induced Brittle Fracture of Type 304L Austenitic Stainless Steel written by GR. Caskey and published by . This book was released on 1981 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Type 304L stainless steel supersaturated with hydrogen gas fails in tension at 200 to 250 K by brittle fracture. Fracture surfaces exhibit isolated facets oriented 0 to 30 deg to the tensile axis. These facets have many of the characteristics of cleavage fracture. The threefold symmetry of Laue back-reflection photographs and trace analysis of deformation bands on the facets demonstrate that fracture is along {111} planes. The fracture paths were identified as coherent twin boundaries on polished sections through facets and on microcracks across interior grains. Although twin-boundary parting is not commonly observed in alloys with a face-centered cubic (FCC) lattice, these observations for Type 304L stainless steel and similar observations of Nitronic-40 and Tenelon demonstrate that parting is possible in austenitic steels under some circumstances.

Download or read book Austenitic Stainless Steels written by P. Marshall and published by Springer Science & Business Media. This book was released on 1984-07-31 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogen assisted Deformation and Fracture of Austenitic Stainless Steels written by and published by . This book was released on 2011 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogen Effects on Flow Localization and Fracture in Type 304L Stainless Steel written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The onset of plastic instability, localization of plastic flow, and fracture in Type 304L austenitic stainless steel are modified by the presence of hydrogen. It is not certain, however, whether the observed changes in behavior are attributable to the direct effect of hydrogen on plastic flow or to the intervention of a hydrogen-induced brittle fracture process. The effects are observed in both smooth bar and single edge notched specimens and are dependent on deformation temperature.

Download or read book Role of Twinning and Transformation in Hydrogen Embrittlement of Austenitic Stainless Steels written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal hydrogen embrittlement may be viewed as an extreme form of environmental embrittlement that arises following prolonged exposure to a source of hydrogen. Smooth bar tensile specimens of three stainless steels saturated with deuterium (approximately 200 mol D2/m3) were pulled to failure in air at 200 to 400°K or in liquid nitrogen at 78°K. In Type 304L stainless steel and Tenelon ductility losses are a maximum around 200 to 273°K; Type 310 stainless steel is not embrittled at this hydrogen concentration. A distinct change in fracture mode accompanies hydrogen embrittlement, with fracture proceeding along coherent boundaries of pre-existing annealing twins. This fracture path is observed in Tenelon at 78°K even when hydrogen is absent. There is also a change in fracture appearance in specimens with no prior exposure to hydrogen if they are pulled to failure in high-pressure hydrogen. The fracture path is not identifiable, however. Magnetic response measurements and changes in the stress-strain curves show that hydrogen suppresses formation of strain-induced .cap alpha.'-martensite at 198°K in both Type 304L stainless steel and Tenelon, but there is little effect in Type 304L stainless at 273°K.

Download or read book Hydrogen assisted Fracture of 12Cr 6Ni 9Mn Stable Austenitic Stainless Steel written by and published by . This book was released on 2011 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogen Assisted Fracture of Welded Aisi 316 Austenitic Stainless Steel written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission from Hydrogen Saturated Type 304L Stainless Steel written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic emission is attributed to energy release within a material body by localized plastic deformation or failure processes. The elastic stress waves may come from slip band formation, mechanical twinning, martensite transformation, or crack propagation. Each of these processes has slightly different acoustic characteristics allowing for easy identification. Acoustic emission was monitored during tensile tests of Type 304L austenitic stainless steel to explore the applicability of the technique to hydrogen-assisted fracture.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogen Degradation of Ferrous Alloys written by Richard A. Oriani and published by William Andrew. This book was released on 1985 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Hydrogen Embrittlement of Sensitized Austenitic Stainless Steels written by Jared Joseph Neuharth and published by . This book was released on 2011 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural Science written by International Metallographic Society and published by . This book was released on 1981 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: