Abstract
12CrNi2 alloy steel has been prepared by means of laser additive manufacturing（LAM）using a commercial alloy steel powder. The results show that the LAMed alloy steel contains a large number of pores intrinsically associated with the reaction of O and C, which form gases in molten pool of the laser melting alloy steel powder. The pore formation can be highly suppressed by adding into the steel powder with small amounts of Cr, because it preferentially reacts with O to form Cr2O3 and consequently prevents the gases formation in the molten pool. The Cr2O3 formation also refines the ferrite and the austenite phases of the LAMed alloy steel and increases its hardness.
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