SLS/CIP/HIP制造微量FeB+AISI304零件

AISI304 parts with addition of FeB manufactured by hybrid technology of selective laser sintering and isostatic pressing

为解决间接选择性激光烧结(SLS)金属零件致密度低与力学性能差等问题,提出将冷等静压技术(CIP)、高温烧结与热等静压技术(HIP)引入SLS.通过排水法结合SEM显微形貌与拉伸性能测试等方法,探讨了在SLS/CIP/HIP过程中高温烧结温度对微量FeB+AISI304 SLS零件致密度影响,微量FeB对其致密度、金相组织与力学性能作用等.结果表明,随烧结温度升高,高温烧结后微量FeB+AISI304 SLS零件致密度逐渐增加;当FeB质量分数从0.5%增加到5%时,其致密度逐渐增加,但是,晶界处-αFe和Fe2B共晶与Ni和Ni3B共晶增多,导致其力学性能逐渐恶化,其中,当FeB质量分数为0.5%时,其致密度、弹性模量、屈服强度、拉伸强度和延伸率分别达到98.1%,209 GPa,338 MPa,527.36 MPa和8%.

In order to solve lower relative density and bad mechanical property of metal parts manufactured by indirect selective laser sintering （SLS）, cold isostatic pressing （CIP） was introduced into SLS combined with high sintering （HS） and Hot isostatic pressing （HIP）. According to drainage, SEM and tensile test etc, not only influence of high sintering temperature on their relative density, but also influence of FeB on relative density, metallurgical structure and mechanical property of AISI304 SLS samples were analyzed in SLS/CIP/HIP. It shows that relative density of AISI304 SLS samples with addition of FeB increases with high sintering temperature increasing after HS. Their relative density increases when addition of FeB increases from 0.5 % to 5 %, but eutectic of and Fe2B increases including eutectic of Ni and Ni3B too, which are located in grain boundary, so their mechanical property worsens. When addition of FeB is 0.5%, relative density of AISI304 metal parts manufactured by SLS/CIP/HIP achieves 98.1% with their Young＇ modulus, yield strength, tensile strength and elongation percentage being 209 GPa, 338 MPa, 527.36 MPa and 8% respectively.