贝氏体和马氏体耐磨钢的高温磨损性能对比研究

目前,对贝氏体和马氏体耐磨钢在高温环境下的磨损性能研究较少。利用销盘磨损试验机,对400 HB级低合金贝氏体耐磨钢NR400和马氏体耐磨钢NM400的高温(400℃)耐磨性能进行了对比研究,利用扫描电镜及台阶仪等对其组织及磨损表面进行分析,并对磨损机理进行了探讨。结果表明:由于NR400钢具有高硬度、较好的回火稳定性和韧性,其磨损率小于NM400钢的,高温耐磨性较好;NM400钢的磨损机理主要为磨粒磨损、氧化磨损和疲劳磨损,NR400钢的磨损机理主要为磨粒磨损和氧化磨损。     

热等静压处理对喷涂层耐磨性影响的研究

研究了热等静压（ＨＩＰ）处理对喷涂层耐磨性及化学成分分布的影响。结果表明,热等静压处理促进了化学成分向基体的扩散、喷涂层的致密度和结合强度的提高,耐磨性提高了近７倍。ＨＩＰ处理的温度也对耐磨性有影响。     

Investigations on the Effect of Ball Burnishing Parameters on Surface Hardness and Wear Resistance of HSLA Dual-Phase Steels

Surface finish has a vital influence on most functional properties of a component like fatigue life, wear resistance, corrosion resistance, etc. This has given birth to processes such as lapping, honing, burnishing, etc. Burnishing is a fine finishing operation involving the cold working plastic deformation of surface layers to enhance the surface integrity and the functional utility of a component. The present study has been carried out to establish the effect of burnishing parameters viz. feed rate, speed, force, ball diameter and lubricant on surface hardness, and wear resistance of HSLA dual-phase steel specimens. The result indicates that burnishing parameters have significant effect on the surface hardness and wear resistance.     

钢氧化磨损的轻微-严重磨损转变

研究了多种钢在400℃高温磨损行为,发现钢具有共同的磨损规律。在低载时钢的磨损率和磨损增长率均较低,随着载荷增加,在某一载荷磨损率快速提高。钢高温磨损的本质是一个包含磨面氧化、基体热软化和塑变的物理化学过程。对钢的高温磨损提出了氧化磨损中轻微-严重磨损转变模型及其特征。     

Wear of Tailored Forming Steels

This study investigates the wear behavior of additively welded cladding layers on less wear-resistant base materials using plasma-transferred arc welding and laser hot-wire cladding. The cladding layers are made from atomized AISI 52100, AISI 5140, and a stainless steel with (0.52 wt% C, 0.9 wt% Si, 14 wt% Cr, 0.4 wt% Mo, 1.8 wt% Ni, 1.2 wt% V, bal. Fe) on unalloyed steel AISI 1022M as the base material. The specimens' microstructure and surface hardness are comparable with conventional specimens of monolithic AISI 52100 and AISI 4140, which is used as a reference. Tribometer tests are carried out in ball-on-disk configuration to investigate the wear resistance of the specimen. The multimaterial specimens show comparable wear behavior to their monolithic counterparts, and a good performance of the stainless specimen in pure sliding is proven. These findings suggest that additive manufacturing processes can be used to clad less wear-resistant base materials and achieve high wear resistance, making it possible to exploit the advantages of surface coatings under severe wear conditions.     

深冷处理参数对点焊Cu-Cr-Zr合金电极的耐磨性能影响

为了更加深入了解深冷工艺对Cu-Cr-Zr合金耐磨性的影响.本工作通过改变深冷处理时间和深冷处理温度来探讨Cu-Cr-Zr合金电极的耐磨性随深冷处理时间和深冷处理温度的变化规律.研究发现这两个参数对于合金的耐磨性的影响都是非常明显的.当深冷温度达到-150℃耐磨性达到峰值.而保温时间表现为大于2h以后合金的耐磨性随着时间增加基本趋于稳定的特点.     

Formation of Friction Layers and Wear Resistance of Steels under Conditions of Boundary Friction

We studied the influence of the lubricant compositions Grafitol with 10% graphite (1), Aerol containing 17% MoS₂ (2), Limol containing 60% MoS₂ (3), Limol + 10% chlorine-paraffin (4), and Limol + 10% copper powder (5) on the wear rate and formation of the fine structure of surface friction layers of structural steels. We established a correlation between the tribological characteristics of steels and lubricants. The abrasive wear of 40KhFA steel was minimum if it was lubricated with Limol + 10% copper powder. In this case, its wear was smaller by a factor of 10, 2, 1.25, and 7.25 as compared with lubricant compositions 1–4, respectively. In the course of minimum wear of 40KhFA steel, in the surface friction layers, we observed the minimum values of second-kind distortions (a/a) and of the true size of domains of X-ray coherent scattering (D) as well as the minimum difference between the crystal lattice constants (a) of steel before and after friction.     

Influence of Carbides and Strain-induced Martensite on Wear Resistance of Austenitic Medium Manganese Steels

The abrasive wear behaviour of austeniticmedium manganese steels was studied under weakcorrosion-abrasive wear simulating the linerplate in wet metallic ore bail mill undernon-severe impact-loading working condition.Results show that the work-hardening mechanismand the wear resistance of high carbon austeniticmedium manganese steels differ from those ofmedium carbon austenitic medium manganese steel.Under non-severe impact and weakcorrosion-abrasive wear,the wear resistancesof high carbon and medium carbon austeniticmedium manganese steels are 50-90% and 20-40%higher than that of Hadfield steel respectively.     

旋耕刀表面强流脉冲电子束改性后的耐磨性研究

为了提高农机零部件的主要磨损部件旋耕刀的耐磨性,延长其使用寿命,采用强流脉冲电子束表面改性技术处理旋耕刀常用材料60Si2Mn钢表面.采用金相显微镜分析形貌,通过显微硬度对比和摩擦磨损分析处理表面的性能,优选加速电压,将其作为优化参数作用于旋耕刀表面,并在土槽台架模拟工况试验.结果表明:电子束表面改性技术可以有效提高旋耕刀的耐磨性,对侧刃内侧处理要优于对侧刃外侧的处理;加速电压为30 kV和27 kV时,旋耕刀表面耐磨性较优,前者的磨损量较小.     

不同加热方式对Ni-P-SiC化学复合镀层性能的影响

采用炉内加热处理和激光加热处理两种方式对Ni-P-SiC化学复合镀层进行了晶化处理.运用显微硬度计、M-2000磨损试验机等对采用两种加热方式处理后的Ni-P-SiC复合镀层进行了性能测定.结果表明,采用激光加热处理后,复合镀层的硬度和耐磨性均高于经炉内加热处理的镀层.     

深冷处理对AISI 310S不锈钢耐腐蚀磨损性能的影响

研究了深冷处理对AISI 310S不锈钢在3.5%(质量分数)Na Cl溶液中耐腐蚀磨损性能的影响,将310S不锈钢在-196℃进行保温深冷处理,结果表明:相对未深冷处理,深冷处理之后,材料的晶粒得到细化,更多碳化物弥散析出基体;深冷处理之后材料的耐腐蚀性能得到提高,在深冷处理4 h时达到最佳值,相比未深冷处理,自腐蚀电位从-0.525 V提高到-0.423 V,提升了19.4%;且深冷处理之后,材料的耐腐蚀磨损性能得到提升,经过深冷处理4 h,材料的磨损率从120×10-6mm3/Nm降低到63×10-6mm3/Nm,降低90%。     

Fatigue Strength of Nitrided Steels in Corrosion-Active Media of the Food Enterprises

Materials Science - We study the effects of the modes of nitriding in glow discharge on the low- and high-cycle fatigue of structural steels in acid, alkaline, and neutral model solutions and in air.     

不同表面处理工艺对快淬NdFeB永磁粉抗氧化性和磁性能影响

本文对快淬ＮｄＦｅＢ永磁粉分别采用化学镀镍,重铬酸盐钝化处理,重铬酸盐钝化还原处理以及硅烷偶联处理的重铬酸盐钝化－还原／硅烷复合处理等工艺进行了表面包覆,研究了表面包覆处理前后的快淬ＮｄＦｅＢ磁粉的抗氧化特性,并初步比较了包覆处理前后的快府ＮｄＦｅＢ磁粉制成粘结ＮｄＦｅＢ磁体的磁性能,结果表明上述工艺方法的均能改善ＮｄＦｅＢ磁粉的抗氧化性,其中以重铬酸盐钝化－还原／硅烷偶联处理形成的包覆层的抗氧化     

Impurity Effect on Wear Resistance of Ultrafine-Grained Copper

The wear properties of ultrafine-grained(UFG) Cu samples of different purities were investigated in comparison with the coarse-grained(CG) Cu.The UFG Cu samples,prepared by means of plastic deformation via quasistatic compression,exhibit an enhanced wear resistance relative to the CG Cu samples.For both the UFG and the CG Cu samples,wear volumes increase at higher purities.A steady state worn subsurface structure was formed in each sample after sliding for 60 min,consisting of a heavily deformed nanostructured mixing layer(NML) on top of a continuous dynamic recrystallization(DRX) layer.A pronounced correlation is identified that wear volume increases monotonically with an increasing grain size of the DRX layer.The impurity level of the Cu samples has an obvious influence on the DRX grain sizes,which in turn determines the wear resistance of the Cu samples.     

热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响

为研究不同温度热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响,采用激光熔覆技术在TA2钛合金表面制备40%Ti-25.2%TiC-34.8%WS_2(质量分数)复合涂层,将涂层分别置于300,500℃和700℃真空中保温1h,分析热处理前后涂层的显微组织和微动磨损耐磨性能。结果表明:未经过热处理涂层及经过不同温度热处理涂层的主要物相均为α-Ti,(Ti,W)C_(1-x),TiC,Ti_2SC和TiS。未热处理及经过300,500℃和700℃热处理1h涂层的显微硬度分别为1049.8,980.7,1143.3HV_(0.5)和1190.7HV_(0.5)。经过700℃热处理1h涂层表现出优异的微动磨损性能,磨损机理为黏着磨损和磨粒磨损。     

纳米填料对环氧胶粘涂层强度及耐磨性的影响

研究了纳米填料(SiO2、有机蒙脱土)在环氧树脂胶粘剂中最佳含量,在此基础上研究不同填料对胶粘剂拉伸剪切强度、冲击弯曲强度和耐磨性的影响，推荐纳米填料环氧树脂胶粘剂最佳配方。     

锅炉受热面抗氧化磨蚀涂层的研究

分析了电厂锅炉受热面热腐蚀磨损原因，对锅炉受热面防护方法进行了总结，研究了几种电弧喷涂表面涂层抗热磨蚀性能，提出了电厂锅炉受热面采用的涂层防护方法，并对现场应用涂层进行检查，电弧喷涂镍铬钛涂层显示出最佳的抗锅炉热腐蚀性能。