激光烧结与等静压复合技术制造致密合金零件

Manufacturing dense alloy parts via selective laser sintering combined with isostatic pressing

通过机械混合Fe,C及环氧树脂粉末配制了选择性激光烧结(SLS)用复合材料,利用SLS方法制备了生坯.分别经过脱脂预烧、冷等静压(CIP)、高温烧结和热等静压(HIP)处理提高其致密度,进而改善其力学性能.并采用阿基米德定律、环境扫描电镜与万能拉伸试验机分别对HIP试样的致密度、微观组织与力学性能进行测试.结果表明:合金材料致密度达到97%左右,极限拉伸强度超过350 MPa,延伸率大于9%,经HIP处理后试样显微组织为粒状珠光体与铁素体.

Composite powders were obtained by mixing Fe, C and epoxy resin powders. Green parts were manufactured via selective laser sintering（SLS）. After the post processes of degreasing, cold isostatic pressing（CIP）, vacuum sintering, hot isostatic pressing（HiP）, the relative density and mechanical property were improved. The forming and post processes were discussed, and the microstructures, mechanical properties and density of the mentioned alloys were tested respectively via environmental scanning electron microscope, universal testing machine and archimedes law. The results showed that the final density exceeds 97 %, tensile strength exceeds 350 MPa and the elongation is about 9%, microscopic structure is granular pearlite and ferrite.