| Effects of carbon content (0%,0.2%,0.3% and 0.4%) on the sintering and corrosion behavior of Metal injection molded 316L and 17-4PH stainless steels were investigated.With the increase of carbon addition, hardness of the sintered 316L stainless steel increases, elongation decreases, tensile strength increase first and then decrease, while it has minor influence on the sintered density of the specimens. The fracture morphology transformed from ductile to brittle at 0.4 wt.% carbon content. After immersed in 0.9 wt.% and 5 wt.% NaCl solutions, the results of corrosion test showed that, in all cases, the corrosion resistances the specimens decrease with increase carbon content. Specimens having 0.2 wt.% carbon content show the highest corrosion rate of 0.73g·m-2·h-1, indicating the worst corrosion resistance.With the increase of carbon addition, hardness of the sintered 17-4PH stainless steel increases, elongation decreases, tensile strength and sintered density increase first and then decrease. Specimens with 0.3 wt.% carbon content have the lowest tensile strength. The fracture morphology alternated from ductile to brittle. After immersed in 0.9 wt.% and 5 wt.% NaCl solutions, the results of corrosion test showed that, in all cases, the corrosion resistances of both specimens decrease with increase carbon content. Specimens having 0.2 wt.% carbon content show the highest corrosion rate of 105g·m-2·h-1, indicating the worst corrosion resistance.The results of the specimens after solution/aging treatment 1040℃(30min)+480℃(240min) showed that, with increase carbon content, hardness of the specimens decrease from HRC40.2, HRC38.9 to HRB97, HRB71.6, with a high corrosion resistance. When only aging treatment 480℃(40min) were applied, the specimens showed a poor corrosion resistance. |
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