钒含量对含铌高镍铬无限冷硬铸铁组织及耐磨性的影响  

Effect of V on microstructure and wear resistance of high Ni-Cr infinite chilled cast iron added Nb

作　　者：彭展南[1] 杨帅 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中铁物总技术有限公司,北京100036

出　　处：《金属热处理》2015年第11期6-11,共6页Heat Treatment of Metals

摘　　要：采用金相显微镜、扫描电子显微镜、X射线衍射仪以及热力学计算等方法研究了不同钒含量的含铌高镍铬无限冷硬铸铁的微观组织及磨损性能的变化规律。研究表明,钒含量从3.0%增加到6.0%,组织中碳化物逐渐由网状向颗粒状和短条状转变,由沿晶分布向均匀分布转变,铸态硬度和回火硬度均呈现出上升趋势,耐磨性逐渐增加;含量达到7.5%时碳化物发生了过度长大现象,硬度下降,耐磨性降低。均匀弥散分布的颗粒状碳化物有利于耐磨性的提高。碳化物的细化或者粗化取决于钒对相图中碳化物生长区域的减小或者增大的影响。Optical microscopy（ OM）,scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,thermodynamic calculation and other research methods were used to study the effects of vanadium element on the microstructure and wear resistance of high Ni-Cr infinite chilled cast iron（ ICCI） added Nb.The results indicate that as vanadium contents increased from 3.0% to 6.0%,the morphology of carbides gradually transforms from net shape to granular and short bar and they distribute along the crystal gradually to uniform,the hardness of both as-cast and tempered samples are shown a rising trend,and the wear resistance also increases gradually.However as vanadium content reaches to 7.5%,the hardness and wear resistance both decrease because of the over-growth of carbides.Evenly dispersed distribution of carbide particles is beneficial to improve wear resistance.Refinement or coarsening of carbides is depended on the effect of vanadium on decreasing or increasing the carbide growing region of the phase diagram.

关 键 词：高镍铬无限冷硬铸铁 碳化物 耐磨性 钒 

分 类 号：TG333[金属学及工艺—金属压力加工]