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Title Hydrogen attack of pressure-vessel steels. Annual report, June 1, 1982-May 31, 1983
Creator/Author Shewmon, P.G.
Publication Date1983 Jan 01
OSTI IdentifierOSTI ID: 6584620; DE83006039
Report Number(s)DOE/ER/12077-T1
DOE Contract NumberAC02-82ER12077
Resource TypeTechnical Report
Research OrgOhio State Univ. Research Foundation, Columbus (USA)
Subject360105 -- Metals & Alloys-- Corrosion & Erosion; ;CHROMIUM-MOLYBDENUM STEELS-- HYDROGEN EMBRITTLEMENT; BUBBLES;METHANE;TRANSMISSION ELECTRON MICROSCOPY;VOIDS
Related SubjectALKANES;ALLOYS;CHROMIUM ALLOYS;CHROMIUM STEELS;ELECTRON MICROSCOPY;EMBRITTLEMENT;HYDROCARBONS;IRON ALLOYS;IRON BASE ALLOYS;MICROSCOPY;ORGANIC COMPOUNDS;STEELS
Description/Abstract Kinetics of hydrogen attack (HA) of 2 1/4 Cr-1 Mo base metal (BM), and weld metal (WM), quenched and tempered to meet ASME Code, were measured using a sensitive dilatometer.^At 500/sup 0/C, and 20 MPa of H/sub 2/, the weld metal grows an order of magnitude faster than does the base metal.^Untempered base metal grows yet an order or magnitude faster than the tempered weld metal.^The effect of temperature and pressure have also been measured and differ for the three types of materials.^Using a TEM-replica technique it has been shown that the as-tempered material contains many submicron pores, all on the ends of carbides, and usually on grain boundaries.^Hydrogen treatment at 550 C and 20 MPa of H/sub 2/ lead to the sintering shut of three fourths of these, but the rest (the larger voids) grew into the methane bubbles that generate hydrogen attack (HA).^The differences in the microvoid density between WM, BM, and heat affected zone (HAZ) have been measured.^They are definite, but not large.^A 1020 carbon steel which nucleates bubbles sparingly was used to study the changes in the growth kinetics and morphology of methane bubbles with temperature, internal pressure, and bubble size.^The transition from spherical to lenticular shape at high pressure, as predcited theoretically by Rice and coworkers, was observed.^The backstress due to matrix creep constraint was also measured.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 10
AvailabilityNTIS, PC A02/MF A01.
System Entry Date2001 May 13

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