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将等静压(IP)技术引入选区激光烧结(SLS)技术,以改善SLS成形零件的致密度与力学性能。采用PA12的TG曲线、拉伸实验与显微形貌等分析手段,探讨了PA12覆膜AISI316L零件的热脱脂机理与工艺,分析了SLS/IP过程高温烧结(HS)与热等静压(HIP)环节FeMn对AISI316L零件致密度与力学性能的影响规律等。结果表明:针对SLS成形AISI316L原型件,制定的脱脂工艺合理;在高温烧结与HIP环节,添加微量FeMn有利于其致密度与拉伸性能改善,经大于300MPa冷等静压(CIP)压制、1320℃高温烧结与1250℃/120MPaHIP处理后,其致密度超过95%,弹性模量、屈服强度、拉伸强度与延伸率分别达到209.5GPa、306MPa、656.45MPa与53.1%。因此,SLS/IP技术为制造高致密高性能金属零件提供了一种新方法。
The isostatic pressing (IP) technology was introduced into the Selective Laser Sintering (SLS) technology to improve the density and mechanical properties of SLS formed parts. The thermal degreasing mechanism and technology of PA12 coated AISI 316L parts were investigated by means of TG curve, tensile test and microstructure analysis of PA12. The effects of high temperature sintering (HS) and hot isostatic pressing (HIP) on SLS / IP process were analyzed. ) Link FeMn AISI316L parts of the density and mechanical properties of law. The results show that the degreasing process is reasonable for SLS forming AISI 316L prototype. Addition of trace FeMn at high temperature sintering and HIP stage is favorable for the improvement of the density and tensile properties of SLS formed by cold isostatic pressing (CIP) of more than 300 MPa and 1320 ℃, high temperature sintering and 1250 ℃ / 120MPaHIP treatment, the densification degree is more than 95%, and the elastic modulus, yield strength, tensile strength and elongation reach 209.5GPa, 306MPa, 656.45MPa and 53.1% respectively. Therefore, SLS / IP technology provides a new method for manufacturing high-density, high-performance metal parts.