316 L不锈钢纤维改性精铸型壳的强度及高温抗变形能力  

Strength and high-temperature deformation resistance of investment casting shell modified with 316L stainless steel fiber

作　　者：廉紫超 吕凯[1,2,3] 丰志成 刘向东 LIAN Zichao;LYU Kai;FENG Zhicheng;LIU Xiangdong(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Ministry of Education Engineering Research Center for Development and Processing Protection of Advanced Light Metals,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Research Center of Advanced Materials Engineering Technology,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]先进轻金属材料开发与加工防护教育部工程研究中心,呼和浩特010051 [3]内蒙古工业大学内蒙古自治区新材料工程技术研究中心,呼和浩特010051

出　　处：《内蒙古工业大学学报（自然科学版）》2023年第5期422-427,共6页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：内蒙古自治区高等学校青年科技英才计划项目(No.NJYT22078);内蒙古自治区高校科研业务费项目(JY20220059);内蒙古自然科学基金项目(No.2021LHMS05003;2019LH05026)。

摘　　要：为了提高硅溶胶型壳的抗弯强度以及高温抗变形能力,直径为10μm的316 L不锈钢纤维被用于对硅溶胶型壳进行改性,对型壳试样的抗弯强度、高温自重变形及高温荷重变形等性能进行了测试。采用SEM对型壳的断口形貌进行观察,用XRD对不同温度下型壳的相组成进行分析,结果表明,型壳抗弯强度均随钢纤维加入量的增多呈先上升后降低的趋势,当纤维加入量为0.10%时,型壳的抗弯强度达到最大值。此时型壳试样的常温抗弯强度、焙烧后抗弯强度及高温(1 200℃)抗弯强度分别达到3.36、7.82、12.06 MPa;高温自重及荷重变形量降至最低,型壳试样的高温自重变形率为0.51%,高温荷重变形量为2.52 mm。通过对断口形貌分析,316 L不锈钢纤维主要依靠自身变形和纤维与基体之间的脱粘拔出抵抗型壳的断裂载荷,进而增加型壳的抗弯强度。In order to improve the bending strength and high-temperature deformation resistance of silica-sol shells for investment casting,316L stainless steel fibers of a diameter of 10μm were used to modify silica-sol shells,and bending strength,high-temperature self-weight deformation and high-temperature load deformation of the shells were investigated.SEM was used to observe the fracture morphology of the shells,and XRD was used to analyze the phase composition of the shells at different temperatures.The results showed that with the increase of the amount of steel fibers,the bending strength increases first and then decreases.When the amount of steel fibers is 0.1%,the bending strength reaches maximum and the high-temperature self-load deformation and load deformation reduces to the minimum.The green bending strength reaches 3.36 MPa.The fired bending strength reaches 7.82 MPa.The high temperature bending strength(1200℃)reaches 12.06 MPa.And the high-temperature self-load deformation reduces to 0.51%,the high-temperature load deformation reduces to 2.52 mm.The fracture morphology analysis found that the 316L stainless steel fibers mainly rely on its own deformation and debonding between the fibers and the matrix to resist the fracture load of the shell,which in turn increases the bending strength of the shells.

关 键 词：钢纤维 纤维复合型壳 强度 熔模铸造 高温抗变形 

分 类 号：TG115.5[金属学及工艺—物理冶金]