Alloy powder for SLM, nickel-based alloy with high mechanical property and preparation method of nickel-based alloy

The invention discloses alloy powder for SLM (selective laser melting). The alloy powder comprises the following components in percentage by weight: 19.0%-19.5% of Cr, 17.0%-17.5% of Fe, 3.0%-3.2% of Mo, 0.9%-1% of Ti, 0.52%-0.56% of Al, 5.1%-5.2% of Nb, 0.2%-0.25% of Mn, 0.04%-0.06% of Co, 0.3%-0.35% of Si and the balance of Ni. The invention further discloses a preparation method of the high-mechanical-property nickel-based alloy, and the preparation method comprises the following steps: taking the alloy powder for additive production, spreading the powder, and then performing selective laser melting forming to obtain the high-mechanical-property nickel-based alloy. The invention further discloses the nickel-based alloy with the high mechanical performance. The nickel-based alloy prepared by the invention has few micro-cracks and holes, and has good mechanical properties. 本发明公开了一种SLM用合金粉末，其成分按重量百分比计包括：Cr19.0-19.5％，Fe17.0-17.5％，Mo3.0-3.2％，Ti0.9-1％，Al0.52-0.56％，Nb5.1-5.2％，Mn0.2-0.25％，Co0.04-0.06％，Si0.3-0.35％，