耐磨高铬白口铸铁

耐磨高铬铸铁的耐磨性取决于共晶碳化物和金属基体。碳化物的数量、形态和组织结构直接影响到耐磨性和韧性。而碳化物和金属基体首先是由其化学成份决定的,所以必须合理设计其化学元素的含量。1.成份设计1.1 铬和碳含量铬和碳是耐磨高铬铸铁的最主要成份,它们的作用是在铸铁内生成(FeCr)7 C 3,根据 Fe—Cr—C 系相图一般所应用的高铬铸铁均处于奥氏体相区,其共晶组织为奥氏体和 M7C3,因为铁素体太软不能硬化故应避免产生铁素体相,M3 C 和过量初生 M7 C3时脆性太大故也不希望。     

高铬白口铸铁的结构研究

用扫描电镜、X—射线衍射分析仪及光学显微镜对5种亚共晶成份高铬白口铸铁的铸态结构进行了研究。结果表明,高铬白口铸铁中的碳化物组成及形态依赖于Cr/C值而变化,晶界处存在Cr,Si元素偏析。     

高铬铸铁轧辊的滚滑动磨损行为

研究了高铬称铸铁轧辊材质的滚滑动磨损行为。实验结果表明高铬铸铁的滚滑动磨损过程是以接触疲劳为主的磨损过程，材料的机械性能对抗疲劳磨损性能有较大的影响。     

Cr18％高铬白口铸铁在砂浆泵上的应用

经一定变质处理的Cr18％高铬白口铸铁用来制作砂浆泵过流件,具有较高的硬度和较理想的耐磨性,且材料成本与镍硬铸铁相当,而使用寿命优于镍硬铸铁。     

在高温下钒对高铬铸铁耐磨性的影响

进行了含钒高铬铸铁在700℃高温状态下的耐磨性试验研究，结果表明钒对高铬铸铁在高温下耐磨性有不利影响，随着含钒量提高，高铬铸铁耐磨性下降。因此必须严格控制在高温下（700℃以上）高铬铸铁的含钒量。     

硼对Cr20白口铸铁组织和性能的影响

从减少Mo,Ni等贵重金属含量、降低生产成本和提高耐磨性的角度出发,对KmTBCr20Mo进行以硼替代部分Mo,Ni的试验,研究硼对Cr20白口铸铁组织及性能的影响.试验结果表明:硼显著提高了试样的铸态硬度,对热处理态硬度影响不大;硼的质量分数在0.1%~0.7%间变化时,随着硼含量的增加,试样的组织由亚共晶态向过共晶态过渡,试样的冲击韧性下降,耐磨性在硼的质量分数为0.32%时相对较好.     

石墨形态和铬含量对铸铁干摩擦学性能的影响

使用ＭＭ—２００磨损试验机研究了石墨形态和铬含量对铸铁与石棉基摩擦材料配副时的干摩擦学性能。结果表明,蠕墨铸铁的磨损率最低;摩擦系数由高到低依次为：片墨铸铁、蠕墨铸铁、球墨铸铁。蠕墨铸铁中,随着铬含量的增加,耐磨性能明显提高,摩擦系数略有降低。在高速、高载荷条件下,铬含量的质量分数达到１．５％时,耐磨性可达普通蠕墨铸铁的４倍以上;随着载荷的增加,蠕墨铸铁的摩擦系数降低,磨损率提高。在高速条件下,摩擦系数降低的幅度比在低速条件下小。铬改善蠕墨铸铁干摩擦学性能的效果在高速使用条件下更为突出。     

Abrasive Wear Behavior of High Chromium Cast Iron and Hadfield Steel-- A Comparison

 Abstract： Wear properties of two different crushers used for grinding raw materials of cement industry are compared using pin-on-disk wear test. The wear test was carried out with different loads on a pin. Abrasive wear behavior of two alloys was evaluated by comparing mass loss, wear resistance, microhardness and friction coefficient. The microstructure of the specimens was detected using optical microscope. The results showed that abrasive wear of high chromium cast iron is lower than that of Hadfield steel. Due to the presence of M7C3 carbides on the high chromium cast iron matrix, impact crushers exhibited higher friction coefficient.     

Abrasive Wear Behavior and Mechanism of High Chromium Cast Iron

The abrasive wear behavior of high chromium cast iron(containing 12.9mass%chromium)austenitized at1 050 ℃for 2hand austempered in salt bath at 320℃for 4hwas evaluated.Abrasive wear was performed using alumina abrasive under four different loads,namely 50,100,150,and 200 N,for 36 000 cycles.The worn surfaces and wear debris were analyzed by scanning electron microscopy,laser confocal microscopy and X-ray diffraction.Microhardness profiles were also obtained in order to analyze the strain-hardening effects beneath the contact surfaces.Results indicate that the retained austenite in high chromium cast iron has experienced induced martensitic transformation after tests,for small amounts of retained austenite could be detected by X-ray diffraction.In addition,there is a close relationship between wear mechanism and test load.Under the condition of lower test load,the wear mechanism is an uninterrupted and repeated process,during which matrix is cut at first and then fine carbides flake off.As to higher test load,scratching and spalling induced by cleavage fracture of blocky carbide are the wear mechanism.     

Effect of Manganese on As-Cast Microstructure and Hardening Behavior of High Chromium White Cast Iron

Highchromiumwhitecastironhasbeenusedaswear resistantmaterialsintheminingandmaterialin dustryduetotheirexcellentabrasionresistanceforhardeutecticcarbidesinthemicrostructure[1- 3] .Highchromiumwhitecastironiscommonlyusedafterheattreatment .Thealloyelementsw…     

含钒蠕墨铸铁干摩擦学性能

研究了含钒蠕墨铸铁与钢盘对磨时的干摩擦学性能。结果表明，钒的加入降低了蠕墨铣的的磨损量，提高了接触压力和摩擦速度变化时磨损量的稳定性。含钒０．１％和０．３％时，提高了摩擦系数和高接触压力，高摩擦速度下降摩擦系数稳定性。     

Characteristics of Deformation Layer for Vermicular Iron under Dry Sliding Friction

At room temperature, dry sliding wear tests were carried out using pin-on disc test rig, in which the pin is made of vermicular iron and the disc is made of 40Cr steel. The microstructures of the frictional surfaces for the pin specimens were investigated. Under the action ofboth frictional heat and frictional shearing stress, a plastic deformation layer under the frictional surface is formed. The morphology and properties of the plastic deformation layer depend on specimen material, contact pressure and frictional shearing stress. In the plastic deformation layer, the phosphorous mass percent varies at different depth and results in different hardness. On the outer side of surface, the hardness is the biggest and the phosphorous mass percent is the highest. They become gradually small from outer side to inner side of the surface.     

钒对中铬白口铸铁组织和性能的影响

研究了钒对中铬白口铸铁的组织与性能的影响.采用SEM与EDS对试样进行了组织与成分分析,并测定了试样的冲击韧性、硬度等力学性能.结果表明:随着V含量的增加,中铬白口铸铁的组织得到细化,冲击韧性得到改善;当V的加入量增加至4%(质量分数)时,基体上弥散分布大量VC颗粒,使得材料有潜在的良好的耐磨性能.     

Wear Mechanisms of High Chromium Iron Roll under Hot Rolling Conditions

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Effect of RE Complex Inoculation on the Fatigue Wear Behaviours of High Chromium Cast Iron

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高铬铸铁的强韧化探讨

在高铬铸铁的铸造过程中运用适当的工艺方法能够极大地改善材料的韧性.但不同的处理方法对高铬铸铁韧化所起的作用也是不同的.笔者系统地分析影响高铬铸铁韧性的因素和各种工艺方法对高铬铸铁韧化的作用原理,并指出提高高铬铸铁材料韧性的努力方向.