Metal injection molding 17-4PH stainless steel

The rheological properties,mechanical properties,microstructure and anticorrosive properties of injection molded 17-4PH stainless steel were investigated.The feedback based on
the binder 65%PW-30%EVA-5%SA has the best general rheological properties for the 17-4 PH stainless steel powder.The 17-4 PH stainless steel compacts sintered at 1380°c for
90min have the best mechanical peoperties and the good microstructure with homogeneously distributed pore structure and the moderate-sized grains.Whereas the compacts sintered
for 60min and 120 min show the inadequate sintered microstructure and the over-sintered microstructure respectively.The compacts sintered at 1 380°c for 90min have the
density of 7.7g/Cubic centimeter ，the strength of 1 275MPa,the elongation of 5%,and the hardness of 36 hrc,With the increase of sintering temperature,the density,strength and
the hardness increase,whereas the elongation decreases. The 17-4 PH stainless steel has good anticorrosive properties and the long corrosion period.It has an activation-
passivation polarization curve,but the passivation potential range is narrow.The spot corrosion is relatively easy to occur.