As the tempering temperature increased, the elongation of the transverse specimen showed an increasing trend, while the elongation of the longitudinal specimen first increasing and then decreasing.
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Effect of Laser Selective Melting on the Microstructure and Properties of Martensitic Stainless Steel After Annealing Treatment.
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The sentences
The elongation of the longitudinally stretched specimen showed a trend of first increasing and then decreasing with the increase in tempering temperature.