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The microstructure of the heat affected zone after welding was investigated in Mod.9Cr–1Mo steel, using TEM and STEM-EDX. The microstructure of thin foil was observed at the fusion line, and at the positions of 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm and 3.5mm to the base metal side of the fusion line. Martensite structure with very fine lath and high dislocation density was confirmed at all positions...
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