期刊
JOURNAL OF NUCLEAR MATERIALS
卷 367, 期 -, 页码 1197-1202出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2007.03.232
关键词
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The nanostructured ferritic alloy (NFA) MA957 was joined by friction stir welding (FSW) and electro-sparked deposition (ESD) welding. Transmission electron microscopy (TEM) and small angle neutron scattering (SANS) characterization studies showed a uniform fine-scale equiaxed ferrite structure with a high dislocation density and slightly coarsened nm-scale particles in the joint region of the FSW weld compared to the base metal. Microhardness and tensile measurements on the FSW showed a modest reduction in the strength of the joint compared to the as-processed NIA957. In contrast, the ESID-welds contained considerable porosity and the rim-scale particles dissolved or coarsened significantly, resulting in a larger degradation of the joint region strength. Thus FSW is a promising method for joining NFAs. (c) 2007 Elsevier B.V. All rights reserved.
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