TiCp/Cr15高铬铸铁复合材料的制备与性能  

Preparation and properties of TiC/Cr15 high chromium cast iron composites

作　　者：吕蓉 肖平安[1] 顾景洪 古思敏 赵吉康 LV Rong;XIAO Ping’an;GU Jinghong;GU Simin;ZHAO Jikang(School of Material Science and Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《复合材料学报》2021年第9期2956-2964,共9页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51574119)。

摘　　要：以TiCp粉末和水雾化Cr15高铬铸铁粉末为原料,采用粉末冶金液相烧结技术制备TiCp增强高铬铸铁复合材料。研究了TiCp含量对高铬铸铁的物相组成、显微组织和力学性能的影响。研究结果表明,全致密的TiCp增强高铬铸铁基体复合材料的构成相为TiC、M7C3型碳化物、马氏体和少量奥氏体;随着TiCp添加量增大,金属基体逐步呈孤岛状,并在其中析出越来越多的M7C3型碳化物,同时TiCp逐步呈连续网状分布;同时,其硬度稳步提升,而抗弯强度和冲击韧性降低。当TiCp添加量为20wt%时烧结态复合材料具有最佳综合力学性能。此时硬度为HRC 66.8,冲击韧性为6.86 J/cm^(2),抗弯强度为1343.10 MPa。当TiCp添加量为25wt%时硬度达到最大值HRC 67.20。TiCp reinforced high chromium cast iron composites with full density have been fabricated by liquid phase sintering technology with water atomized Cr15 high chromium cast iron powders and TiC particles as raw materials.The effect of TiC content on the microstructure evolution,phase composition and mechanical properties was investigated systematically.The research results show that the composites consist of TiC,M7C3 type carbides,martensite and a small amount of austenite;With the increase of TiCp addition,the metal matrix is gradually partitioned into island-like fragments,and M7C3 type carbides are principally precipitated in them.Hence continuous TiC particle network is formed step by step either.The composites’hardness steadily increases at the same time,while both its bending strength and impact toughness decline.The sintered composite obtains its optimized mechanical quality as the TiCp addition amount is 20 wt%,that is hardness of HRC 66.8,the impact toughness of 6.86 J/cm^(2) and bending strength of 1343.10 MPa.Its hardness reaches the maximum value of HRC 67.20 while 25 wt%TiCp is added.

关 键 词：高铬铸铁 TICP 复合材料 显微组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]