Cr_(3)C_(2)添加量对TiC/Ti复合材料组织与力学性能的影响  

Effects of Cr_(3)C_(2) Addition on Microstructure and Mechanical Properties of TiC/Ti Composites

作　　者：贾旭明 JIA Xuming(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《热加工工艺》2023年第11期118-123,126,共7页Hot Working Technology

摘　　要：以Cr_(3)C_(2)粉末作为碳源,海绵钛为基体,利用真空感应悬浮熔炼炉制备原位自生TiC/Ti复合材料。研究了Cr_(3)C_(2)添加量(3wt%、6wt%、9wt%)对复合材料微观组织和力学性能的影响。采用X射线衍射仪、扫描电子显微镜和透射电镜对不同Cr_(3)C_(2)添加量的复合材料的物相组成和微观组织结构进行表征。使用洛氏硬度计和室温拉伸性能试验机对复合材料的室温力学性能进行检测。结果表明:随Cr_(3)C_(2)添加量增加,TiC形貌从细长条状到等轴状再到枝晶状转变,基体组织从片层α’转变为针状马氏体α’,晶粒尺寸大幅度下降;复合材料的洛氏硬度从12.2 HRC提高至40.2 HRC,抗拉强度和伸长率均先升高后下降,当Cr_(3)C_(2)添加量为6.0 wt%时,抗拉强度和伸长率最大。Taking Cr_(3)C_(2) powders as the carbon source and titanium sponge as the matrix,in situ formed TiC/Ti composites were prepared by using a vacuum induction suspension melting furnace.The effect of Cr_(3)C_(2) additions(3wt%,6wt%,9wt%)on the microstructure and mechanical properties of the composites was investigated.The physical phase composition and microstructure of the composites with different Cr_(3)C_(2) additions were characterised by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.Mechanical properties of composite materials were tested by using Rockwell hardness tester and room temperature tensile properties tester.The results show that with the increase of the addition of Cr_(3)C_(2),the morphology of Ti C changes from elongated strips to equiaxed and then to dendritic,the microstructure of the matrix changes from lamellarα'to acicular martensiteα',and the grain size decreases dramatically.With the increase of Cr_(3)C_(2) content,the Rockwell hardness of the composites increases from 12.2 HRC to 40.2HRC,the tensile strength and elongation rises firstly and then falls.When the addition amount of Cr_(3)C_(2) is 6.0 wt%,the tensile strength and the elongation are the maximum.

关 键 词：钛基复合材料 TIC 真空感应悬浮熔炼 显微组织 

分 类 号：TB333.12[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—金属材料]