NbC和非晶相共强化高锰钢基复合材料的力学性能与微观组织  

Mechanical Properties and Microstructure of Highly Mn Steel Matrix Composites Strengthened by NbC and Amorphous Phase

作　　者：李海宾 彭建洪[1] 王万玺 陈平 丰义航 LI Haibin;PENG Jianhong;WANG Wanxi;CHEN Ping;FENG Yihang(College of Physics and Electronic Information Engineering,Qinghai Nationalities University,Xining 810007,China)

机构地区：[1]青海民族大学物理与电子信息工程学院,青海西宁810007

出　　处：《热加工工艺》2020年第2期65-69,共5页Hot Working Technology

基　　金：国家科技部国际合作项目(2015DFR50990).

摘　　要：采用粉末冶金法制备了不同体积分数的NbC颗粒增强的NbC/ZGMn13复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和能量色散X射线光谱(EDX)分析了复合材料的相组成、微观结构和元素分布。采用阿基米德法、洛氏硬度计和压缩万能试验机测试了复合材料的密度、硬度和压缩性能,并研究了NbC含量对复合材料力学性能的影响。结果表明,NbC/ZGMn13复合材料主要由NbC相、α-Fe相、晶界析出FexMnyC相和非晶相组成,能在低温下(1100℃)形成非晶复合材料。随着NbC含量的增加,NbC颗粒在基体中的分布越均匀。5vol%NbC/ZGMn13复合材料具有良好的综合性能,其压缩屈服强度和硬度分别达到1843 MPa和46.5 HRC,与ZGMn13基体相比,复合材料的力学性能有较大提高。ZGMn13基体的断口是典型的韧性断裂,出现分布均匀的韧窝。随着NbC体积分数的增加,复合材料的断口为脆性断口,表现出溃散状。NbC/ZGMn13 composites with different volume fractions were prepared by powder metallurgy.The phase composition,microstructure and element distribution of the composites were analyzed by X-ray diffraction(XRD),scanning electron microscope(SEM)and energy dispersive X-ray spectroscopy(EDX).The density,hardness and compression properties of the composites were measured by archimedes method,Rockwell hardness tester and compression universal testing machine.The effect of NbC content on the mechanical properties of the composites was also studied.The results show that NbC/ZGMn13 composites are mainly composed of NbC phase,α-Fe phase,grain boundary precipitation FexMnyC phase and amorphous phase.Amorphous composites can be formed at low temperature(1100℃).With the increase of NbC content,the distribution of NbC particles in the matrix is more uniform.5 vol%NbC/ZGMn13 composites have good comprehensive properties,its compressive yield strength and hardness reach 1843 MPa and 46.5 HRC,respectively.Compared with the ZGMn13 matrix,the mechanical properties of the composite are greatly improved.The fracture surface of ZGMn13 matrix is a typical ductile fracture with uniform distribution of dimples.With the increase of NbC volume fraction,the fracture surface of the composites is brittle fracture,showing collapsing.

关 键 词：粉末冶金法 NBC 非晶相 复合材料 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]