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The Radiation Hardening and Embrittlement of a Mild Steel Submerged-Arc Weld Pages: 20 Published: Jan 1994
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View License Agreement Source: STP1175-EB Abstract This paper provides details of accelerated irradiation experiments on a Magnox mild steel submerged-arc weld at mean irradiation temperatures of 165°C and 269°C. The irradiation-induced changes in mechanical properties and weld microstructure have been determined. Irradiation increased the 40J transition temperature and the yield stress. The increase in transition temperature at a given dose was rather higher in the lower temperature irradiations. Irradiation-induced precipitates of about 2nm diameter were produced in both series of irradiations. Small angle neutron scattering data indicated a precipitate composition of about 75Cu25Mn (at%). Electron microscopy confirmed the presence of copper-rich precipitates of that size. The irradiation dose ranges covered the development stage of the precipitation. The directly measured and (yield stress) derived transition shift data were interpreted satisfactorily using a mechanistically based model involving a matrix damage component and a component attributable to copper precipitation. Keywords: irradiation embrittlement, pressure vessel steels, weld metal, copper, mechanisms modelling Paper ID: STP23945S Committee/Subcommittee: E10.08 DOI: 10.1520/STP23945S ASTM International is a member of CrossRef. | ||