Ni元素对VC增强铁基复合材料组织和性能的影响  

Effects of Nickel Element on Microstructure and Properties of VC Reinforced Iron-base Composite

作　　者：鲜勇 丁义超 陈德平 王静 王槐 Xian Yong;Ding Yichao;Chen Deping;Wang Jing;Wang Huai(School of Materials Engineering,Chengdu Technological University,Chengdu 611730,Sichuan,China)

机构地区：[1]成都工业学院材料工程学院

出　　处：《钢铁钒钛》2019年第6期34-37,共4页Iron Steel Vanadium Titanium

基　　金：四川省科技厅项目(2018JY0278);四川省教育厅项目(17ZB0033)

摘　　要：以FeV粉、金属Ni粉、石墨等粉末为原料,在烧结温度1150 t、压力20 MPa的条件下,原位合成了VC增强铁基复合材料。使用X射线衍射(XRD)分析物相,测试三点抗弯强度和洛氏硬度,并用扫描电镜(SEM)分析微观组织和断口形貌,结果表明:由于Ni元素具有稳定奥氏体的作用,当Ni含量超过6%时,铁基体开始出现a-Fe和7-Fe双相,其微观组织为珠光体和奥氏体。试样的硬度和抗弯强度均随Ni含量的增加而升高,当Ni含量逐步增加至9%,硬度(HRC)从39增大至43.7,抗弯强度从1028 MPa提升至1926 MPa,断裂方式由解理断裂向韧窝断裂转变。VC reinforced iron matrix composites were synthesized in situ from FeV powder,Ni powder and graphite powder under sintering temperature of 1 150 ℃ and pressure of 20 MPa.X-ray diffraction(XRD) was used to analyze the phases.Three-point bending strength and Rockwell hardness were tested,and scanning electron microscopy(SEM) was used to analyze the microstructure and fracture morphology.The results show that,due to the stabilization of austenite by Ni,dual phases of α-Fe and γ-Fe appear in the iron matrix when the content of Ni exceeds 6%,with its microstructure of pearlite and austenite.The hardness and bending strength of the specimens increase with the increase of Ni content.When Ni content increases to 9%,the hardness increases from 39 HRC to 43.7 HRC.The bending strength increases from 1 028 MPa to 1 926 MPa,and the fracture mode changes from cleavage fracture to dimple fracture.

关 键 词：铁基复合材料 VC Ni含量 组织 性能 

分 类 号：TF841.3[冶金工程—有色金属冶金] TB333.1[一般工业技术—材料科学与工程]