铁基高温耐磨堆焊焊条的研究

研究了Ｃｒ－Ｎｉ－Ｂ－Ｗ－Ｖ－Ｎｂ和Ｃｒ－Ｂ－Ｗ－Ｍｏ－Ｎｂ两种合金系统的高温耐磨堆焊合金焊条，其堆焊层组织分别为合金奥氏体＋骨架状共晶碳化物＋颗粒状共晶碳化物，隐晶马氏体＋块状硬质相，颗粒状硬质相，具有较高的高温硬度和高温耐磨性。     

耐磨合金堆焊焊条研究

对高碳Ｗ１２Ｍｏ６Ｖ３Ｃｒ２合金系统的合金焊条进行试制研究,发现当合理调整焊条化学成分时,能时缝金属具有隐晶马氏体、残余奥氏体、碳化物组织,其组织晶粒细化,加之,焊条采用碱性渣系和适当地过渡钒在焊缝金属中的含量,从而大大地提高了焊条的工艺性能和焊缝金属的抗裂性能。     

大型45铸钢齿轮专用耐磨堆焊焊条的研制

根据矿山机械、水泥机械等大型齿轮磨损堆焊性能的要求，有针对性的研制出了具有耐冲击、金属间接触疲劳磨损的堆焊焊条。这种焊条的堆焊层组织是奥氏体基体上分布着碳化物、硼化物硬质相，有较高的塑韧性和加工硬化效应，它既有高抗裂性，又有良好的耐磨性，工艺性也优良，是一种应用范围较大的新型耐磨堆焊材料，该种焊条用于直径等大型齿轮（４５铸钢件）表面堆焊后的实际运转考核中表明：齿轮运转正常，耐磨性能良好，经济效益高。     

EDC68耐磨堆焊电焊条的研制

采用ＺＷＺＹ５配方设计系统订试验方案，对试验数据进行直观分析，正交回归、处的地位和作用等建立了堆焊金属硬度的回归方程，找出了各药皮成分对堆焊金属硬度，抗裂性，工艺性能等的影响规律，研制成功了综合性能优良的ＥＤＣ６８超高度，超高耐磨，高、高韧性，耐冲击堆焊电焊条。     

耐磨合金堆焊焊条研究

对高碳W12Mo6V3Cr2合金系统的合金焊条进行试制研究,发现当合理调整焊条化学成分时,能使焊缝金属具有隐晶马氏体、残余奥氏体、碳化物组织,其组织晶粒细化,加之,焊条采用碱性渣系和适当地过渡钒在焊缝金属中的含量,从而大大地提高了焊条的工艺性能和焊缝金属的抗裂性能。     

TiC型双熔敷极耐磨堆焊接头组织与性能研究

采用原位自生的方法制备了TiC增强型耐磨堆焊熔敷层,对比了双熔敷极焊条电弧焊、传统焊条电弧焊对熔敷层组织和显微硬度的影响。分别在150 A、180 A和210 A焊接电流下进行两种电弧焊焊接,分析表明:焊接接头各区域组织都随焊接电流的增大而粗化,双熔敷极焊条电弧焊所得熔敷层组织比传统焊条电弧焊细;显微硬度随着焊接电流的增加,都呈现先上升后下降的趋势,熔敷层硬度最大值都出现在焊接电流为180 A时。     

龟裂表面对耐磨堆焊层耐磨性影响的有限元分析师

采用有限元法进行应力计算,用Fortran77语言编制了有限元程序,在Fortran Power-Station 4.0的环境下运行,研究了几何龟裂表面对耐磨堆焊层耐磨性的影响,结果表明,几何龟裂可以使焊接残余应力得到松驰,在某些条件下,可能使表面耐磨料磨损性能得到提高。     

阀门密封面高温耐磨堆焊合金的研究

通过研制５２号合金与１３７号金常温和高温硬度对比测试以及金相组合的对比分析，证明了５２号合金是比较理想的作为阀门密封面高温耐磨堆堆焊的合金材料，用它来代替目前遍使用的钴铬钨贵重合金，具有较高的经济效益。     

Fe-Cr-B耐磨堆焊焊条在高温料钟上应用的研究

研究了一种特制的Fe－Cr－B系列的特种堆焊材料,用于焊接高温料钟标尺竿．该种材料主要以CrB为硬化耐磨相,具有良好的耐磨型和高温抗氧化性．在400～500℃高温耐磨条件下工作,取得了较好的使用效果．对这种焊接材料的成分、组织进行了探讨,对其耐磨机制也做了分析．     

铁基高温耐磨堆焊焊条的设计

我国当前研制应用于生产的耐磨堆焊材料大部分是沿用过去的铁铬碳系。铁铬硼系。高铬铸铁合金系统和等离子弧用的粉末钴基、镍基材料．它们在抗蚀、耐磨及热稳定性等方面均有突出的优点，但在实际应用中有一定的困难，钴和镍是价格昂贵的稀有金属，研究出高温耐磨而且价格低廉的堆焊材料是非常有必要的．针对高温耐磨料磨损的情况，采用不锈钢焊芯，通过药皮向堆焊层中过渡合金元素的方法，合成多种硬质相，达到多元复合强化的目的．通过正交回归设计方法研制出了一种铁基高温耐磨堆焊焊条．     

Wear behavior of bainite ductile cast iron under impact load

The dry impact wear behavior of bainite ductile cast iron was evaluated under three different impact loads for 30000 cycles. The strain-hardening effects beneath the contact surfaces were analyzed according to the surfaces＇ micro-hardness profiles. Scanning electron microscopy （SEM） and X-ray diffraction （XRD） were used to observe the wom surfaces. The results indicated that the material with the highest hardness was the one continuously cooled at 20℃, which exhibited the lowest wear rate under each set of test conditions. The hardness of the worn surface and the thickness of the hardened layer increased with the increases in impact load and in the number of test cycles. The better wear performance of the sample cooled at 20℃ is attributed to its finer microstructure and superior mechanical properties. All the samples underwent the transformation induced plasticity （TRIP） phenomenon after impact wear, as revealed by the fact that small amounts of retained austenite were detected by XRD.     

低合金耐磨钢的组织与性能

低成本、高性能耐磨钢的需求增长及其开发都在进行中．本研究根据对耐磨钢性能的要求,试制了三种不同合金化方式的低合金耐磨钢,利用金相显微镜、透射电子显微镜、洛氏硬度计、万能材料试验机、夏氏冲击试验机和磨粒磨损实验机研究了其组织和性能,讨论了它们问的关系．结果表明：0．25C钢经不同工艺热处理后均获得了马氏体组织,并发生不同程度的自回火现象,硬度均大于45HRC,屈服强度大于1000MPa,抗拉强度大于1500MPa,并具有一定的塑性和韧性;在860℃淬火或920℃淬火并250℃回火后,实验钢的硬度、强度、塑性和韧性有最佳的配合,耐磨性最佳;V微合金化对钢的组织和性能没有明显影响．0．33C钢860℃或920℃奥氏体化后以等于或大于2．0％／s的冷速连续冷却或风冷至室温,回火或不回火即可得到由贝氏体与马氏体组成的混合组织,硬度超过50HRC,屈服强度大于900MPa,抗拉强度大于1500MPa,有一定的塑性和韧性,耐磨性良好,与商用淬火一回火耐磨钢类似;但由于具有高的加工硬化能力和良好的冲击韧性,在冲击条件下的耐磨性会优于商用钢．不同工艺热处理后的试验钢的磨损率随砂纸粒度和载荷增大而增大,载荷的影响较大,而磨粒的影响较小．     

Influence of Impact Energy on Impact Corrosion-abrasion of High Manganese Steel

The impact corrosion-abrasion properties and mechanism of high manganese steel were investigated under different impact energies. The result shows that the wearability of the steel decreases with the increase of the impact energy. The dominant failure mechanism at a lower impact energy is the rupture of extrusion edge along root and a slight shallow-layer spalling. It transforms to shallow-layer fatigue flaking along with serious corrosion-abrasion when the impact energy is increased, and finally changes to bulk flaking of hardened laver caused by deeo work-hardening and heaw corrosion-abrasion.     

Relationship among wear-resistance of three-body abrasion, substructure and property in martensite steels

The effects of subsurface hardness on wear-resistance of martensitic steel 20Cr, 40CrSi, 60Mn, T8 and T10 in three-body abrasion under static load was investigated. It shows that the characteristic of the subsurface hardness distribution and the abrasive wear resistance is related to the substructure near the worn surface. The substructure of the tested martensite steel has an apparent relationship with the carbon content and steels with moderate carbon content and hardness exhibit good resistance to abrasive wear. The competition of the work-hardening effect and the temper softening effect, which resulted from deformation and friction heat generating during abrasive wear is considered to be a main reason for the relation among wear-resistance, hardness and substructure. At the test conditions, the wear-resistance of 40CrSi is the best.     

铬硼钨钼铌钒系高温抗磨料磨损堆焊焊条的研究

研究出了Ｃｒ－Ｂ－Ｗ－Ｍｏ－Ｎｂ－Ｖ合金系统的高温抗磨堆焊合金焊条，其堆焊层组织为隐晶马氏体十块状硬质相十颗粒状硬质相，使其具有较高的高温硬度和高温耐磨性。     

新型复合防腐耐磨材料的研究

尝试选用某新型1#耐酸硅酸盐填料制备防腐耐磨材料，通过对材料耐酸耐磨性能的试验研究，发现该新型材料的耐稀酸性偏低，耐磨度较好．加入2#填料和改性剂后，材料的耐酸度得到显著提高，并测定了新型材料的综合性能，达到了现行耐酸材料的标准，表明该材料具有良好的推广应用前景．     

热处理工艺对低合金耐磨钢组织和性能的影响

通过对低合金耐磨钢热处理工艺试验．研究了不同淬火和回火温度对材料组织和性能的影响．结果表明：经过920℃／30min水淬＋260℃／2h回火处理后,试样晶粒细小,组织为板条马氏体、碳化物和少量残余奥氏体,并具有最佳的冲击韧性和硬度．     

The Wear Process of PTFE Coatings Under Vacuum Conditions

The wear process of PTFE coatings sliding against GCrlS-bearing steel ball under vacuum conditions was investigated, and the hardness of the PTFE coatings on both sides of wear track was measured. The experimental results showed that the friction coefficient of the PTFE coatings increases with the increase of sliding distance under different sliding velocities. And the friction coefficient of the PTFE coatings increases with the increase of sliding distance under different sliding loads. The wear rate of PTFE coatings decreases with the increase of sliding distance. And the majority of the wear produced during the whole wear process of PTFE coatings sliding against GCr-15 steel ball comes from the early period of friction. The hardness of PTFE coatings on both sides of wear track increases as the distance increases and distributes symmetrically around the wear track. Scanning electron microscope （SEM） was utilized to investigate the worn surface of PTFE coating, h was found that the worn surface of PTFE coating is characterized by sever plastic deformation and spalling of the PTFE coating. The edge of wear track is characterized by micro cracking.     

SiC粒径对PTFE/SiCp复合材料耐磨性能的影响

利用机械混合法制备了不同粒径SiCp填充聚四氟乙烯（PTFE）复合材料PTFE／SiCp，并采用M－200型环－块材料磨损试验机在干摩擦条件下对其磨损特性进行了研究，并利用扫描电子显微镜（SEM）及能谱仪对复合材料的磨损表面和摩擦环表面进行了形貌观察及检测。结果表明：SiCp的加入大大提高了PTFE的耐磨性能，SiCp粒径的大小是影响复合材料耐磨性能及磨损机理的重要因素之一。