TiC/316L复合材料的致密化和力学性能试验  

Densification and mechanical properties of TiC/316L composites

作　　者：蔺绍江[1,2] 熊惟皓[1] 瞿峻[1] 姚振华[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [2]黄石理工学院机电工程学院,湖北黄石435003

出　　处：《华中科技大学学报（自然科学版）》2011年第1期50-53,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2007AA03Z115)

摘　　要：采用真空烧结法制备出TiC颗粒增强316L不锈钢复合材料.通过对试样进行光学显微分析并测定其相对密度和拉伸性能,研究了增强相含量和模压压力对复合材料的致密化和拉力学性能的影响,并对断口形貌进行分析.结果表明:添加TiC颗粒有利于复合材料的烧结致密化;TiC颗粒的体积分数对复合材料的拉力学性能有较大影响,当TiC的体积分数从0%增加到10%时,复合材料的抗拉强度从543MPa提高到655MPa,而断裂应变却从0.325减至0.052;在较低的模压压力下,提高模压压力有利于复合材料的相对密度、抗拉强度的增加;但过高的模压压力会使试样在烧结后残余封闭孔隙,降低复合材料的塑性性能和抗拉强度.当模压压力为500MPa时,可得到相对密度高、组织致密、增强相颗粒分布均匀、拉伸性能良好的复合材料.TiC particles reinforced 316L stainless steel composites were fabricated by vacuum sintering method,and the effect of volume fraction（TiC） and moulding pressure on densification and tensile properties of composites was studied by optical micrograph analysis,density and mechanical properties measurement.The results show that the addition of TiC can improve the densification of the composite during sintering.The addition of TiC has a great effect on the tensile properties of sintered composites.As the TiC content increased from 0% to 10%,the tensile strength of the 316L stainless steel composite rose from approximately 543 MPa to 655 MPa while the fracture strain decrease from 0.325 to 0.052.Furthermore,the relative density,tensile strength of 316L stainless steel composites were increased with the increase of the moulding pressure,however,too high pressure result in worse plastic properties and lower tensile strength of the composites with some residual closed pore.The optimal pressure was 500 MPa and at this pressure,the sample shows its high relative density,homogeneous microstructure,uniform structure and good performance.

关 键 词：粉末冶金 316L不锈钢 复合材料 力学性能 致密化 

分 类 号：TB331[一般工业技术—材料科学与工程]