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A gray iron was treated through low-power plasma-arc scanning. Effects of plasma-arc treatment on the surface structure were investigated through optical microscopy, scanning electron microscopy and X-ray diffraction. Sliding tests were conducted to determine the effects of plasma-arc treatment on the wear resistance. Microhardnesses were measured at the cross-section of sample as a function of spacing...
The surface microstructure and the anodic polarization curves in a 1 N H 2 SO 4 solution of a 0Cr19Ni9 submerged arc welded joint were studied before and after surface melting using a 4-A micro-plasma arc. The results showed that both the heat-affected zone and the weld metal of the as-welded joint had a lower corrosion resistance than the as-received parent material, while the arc...
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