【摘要】 利用激光选区熔化成形技术(SLM)制备18Ni300模具钢试样。通过与锻造试样对比，分析了SLM成形18Ni300模具钢试样的组织和在3.5%(质量分数)NaCl溶液中的耐蚀性。结果表明，SLM成形试样的硬度略微低于锻态试样；SLM成形试样的显微组织中存在孔隙缺陷；SLM成形试样的伏打电位比锻态试样低；极化曲线测试结果与浸泡腐蚀结果均表明，SLM成形试样的耐蚀性较锻态试样差。更多还原

【Abstract】 The 18 Ni300 die steels were prepared by the Selective Laser Melting(SLM). Compared with the forged sample, the microstructure and corrosion resistance of 18 Ni300 die steel sample prepared by SLM in 3.5%(mass fraction) NaCl solution was analyzed. The results show that the hardness of the SLM formed specimen is slightly lower than that of the forged specimen. There were many small holes in the microstructure of SLM sample; the volta potential of SLM formed sample is lower than that of forged sample; the corrosion resistance of SLM formed sample is worse than that of forged sample according to the results of the polarization curve test and immersion corrosion test.更多还原