Formation of Thicker Hard Alloy Layer on Surface of Aluminum Alloy by PTA Overlaying with Metal Powder(Materials, Metallugy & Weldability)

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The formation of a thicker hard alloyed layer have been investigated on the surface of aluminum cast alloy (AC2B) by PTA overlaying process with Cr, Cu and Ni metal powders under the condition of overlaying current 125-200A, overlaying speed 150mm/min and different powder feeding rate 5-20g/min. In addition the characteristics of hardening and wear resistance of alloyed layer have been examined in relation to the microstructure of alloyed layer. Main results obtained were summarized as follows: 1) There was an optimum overlaying condition to get a good alloyed layer with smooth surface. This good layer became easy to be formed as increasing overlaying current and decreasing powder feeding rate under a constant overlaying speed. 2) Cu powder was the most superior one in metal powders used due to a wide optimum overlaying condition range, uniform hardness distribution of Hv250-350, good wear resistance and freedom from cracking in alloyed layer with fine hyper-eutectic structure. 3) On the contraty, irregular hardness distribution was usually obtained in Cr or Ni alloyed layers of which hardness was increased as Cr or Ni contents and reached to maximum hardness of about Hv400-850 at about 60wt%Cr or 40wt%Ni in alloyed layer. 4) Cracking occurred in Cr or Ni alloyed layers with higher hardness than Hv250-300 at more than 20-25wt% of Cr or Ni contents in alloyed layer. Porosity was observed in all alloyed layers but decreased by usage of spherical powder with smooth surface.
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Formation of Thicker Hard Alloy Layer on Surface of Aluminum Alloy by PTA Overlaying with Metal Powder(Materials, Metallugy & Weldability)

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