在Ar气和空气环境中激光立体成形了Inconel 718镍基高温合金坯.显微组织观察、拉伸性能和高周疲劳性能测试结果表明:Ar气和空气环境中成形合金的沉积态和热处理态组织基本相同,沉积态组织为沿沉积方向连续生长的粗大柱状枝晶,组织细密、均匀;热处理后发生再结晶,柱状晶转变为等轴晶;2种气氛下成形件热处理后的静载拉伸性能满足锻件标准,空气环境中成形试佯的拉伸强度略高于Ar气环境中成形的试样,但是前者的塑性略低;前者的疲劳性能比后者约低30%,这主要是由于空气中成形的试样中存在较多的氧化物夹杂和显微气孔等缺陷;二者的疲劳性能均低于锻件标准,主要原因是试样中存在氧化物夹杂、显微气孔等冶金缺陷以及热处理后的晶粒尺寸较大.
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