| A bimetal composed of D₂tool steel and Cu-Sn alloy as base metal and weld metal, respectively, was made by MIG welding process. Tensile test, Charpy V_notch impact test (load-deflection) and elastic-plastic fracture toughness test (J_(IC)) were made on D₂tool steel Copper bimetal to investigate the bonding strength and wear test was accomplished for base metal. Results obtained from the interface are as follows σ_(uts)=21.5(㎏/f㎟) Kid=47.3(J/㎠) σ_(ys)=18(㎏.f/㎟) j_(IC)=1.9(㎏.f/㎜). The fracture in tensile test and elastic-plastic fracture toughness test took place in copper around interface but, in Charpy V-notch impact test, fracture occured partly in D₂tool steel. Wear resistance of the base metal (D₂) was superior to those of AISI 1045 and 304 stainless steel. |
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