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本文通过一些典型例子,从其形式、特点和机制来试图说明和解释金属热磨损失效的三种类型;热粘着磨损;热磨蚀磨损;热微动磨损。简要地谈及了国内外在热磨损所属的三个分支上的研究动态。根据O.Vingsbo的摩擦系统理论,从设计、材料、环境这三个角度来考虑探讨减少热磨损的相应对策。 相似文献
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模具磨损是模锻成型过程中模具的主要失效形式,因此如何减小模具磨损量,进一步提高模具的使用寿命,是模锻工艺中急需优化的关键性问题。提出一种模锻成型过程中基于模具磨损的工艺参数优化方法,属于模锻工艺领域,是一种将模锻加工过程中的有限元模拟仿真试验与正交试验设计相结合的工艺参数优化方法。以热模锻工艺为例,在Archard磨损模型的基础上,推导出适用于热模锻模具磨损分析的修正模型,并且对热模锻中模具磨损过程进行基于Deform软件的有限元仿真分析。研究热模锻加工过程中模具工作表面的磨损深度与模锻工艺参数之间的关系,利用正交试验设计将不同的工艺参数进行组合分析,通过较少的仿真试验次数得到适用于热模锻的最优化工艺参数。使用极差分析法进行试验数据处理,推导出对模具磨损影响程度最大的工艺参数,为热模锻工艺中的模具磨损问题提供一种基于正交试验设计的工艺参数优化方法,得到模锻成型过程中使模具磨损量实现最小值的工艺参数最优解。 相似文献
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《承德石油高等专科学校学报》2017,(5)
研究铸态AZ61镁合金在销-盘接触模式下的干磨损行为,测量AZ61镁合金在0.1~2.0 m/s滑动速率下加载20~360 N时摩擦系数和磨损率的变化,结果表明:合金磨损机制包含了微观切削、氧化磨损、磨粒磨损、剥层磨损、热软化磨损和融化磨损。加载载荷较小时,滑动速率增加减少磨损面之间微接触点作用时间,造成材料应变滞后,合金磨损率逐渐减小,摩擦系数减小。增加载荷,滑动速率增加,剥层磨损出现并主导磨损率的增加。其后热软化磨损和融化磨损导致磨损表面材料转移更加严重,磨损率出现急剧增加。热软化时发生化合物融化导致磨损率增加不连贯性。 相似文献
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在MM-1000磨损试验机上,对35CrMo钢与石棉和半金属摩擦材料组成的摩擦副进行了制动磨损试验,重点研究了钢的制动磨损机理,研究结果表明,钢的制动磨损形式主要是磨粒磨损、氧化磨损和粒着,因摩擦热的影响,制动后钢的摩擦表面出现热震开裂,表层组织过热甚至过烧,表面的粘着物由表向里扩散,钢在制动过程中还出现特有的浅层剥落,它是一个塑料性变形积累,裂纹裂成和扩展的过程。 相似文献
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对1-2-3新型摩擦复合材料进行热失重分析试验和热磨损试验,分析处理试验结果,建立了1-2-3新型摩擦材料的热磨损模型。研究表明1—2-3新型摩擦复合材料具有较高的耐热性和较低的磨损率。 相似文献
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对热态飞灰磨损试验系统的测量与计算误差进行分析,并且进行了试验系统的稳定性与复现性试验,记叙昨现性能有较精确和稳定地反映试验数据,是热态飞灰磨损研究的有力工具,另外,文中详细地叙述了试验的步骤保要注意的问题。 相似文献
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首先介绍了聚氨酯的力学特性,然后运用扫描电子显微镜和表面红外分析仪对磨损后衬垫表面的微观形貌及官能团的组成进行了分析,发现了聚氨酯热降解的证据,并在此基础上对钢丝绳- 聚氨酯衬垫这一摩擦副的磨损机理进行了分析、探讨.作为从微观角度研究高分子材料衬垫的磨损过程,其结果有助于深入地了解高分子材料的磨损机理,对改善衬垫的磨损性能,提高其寿命有一定的实用价值. 相似文献
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CHENG Xianhua SHANGguan Qianqian WU Ju 《武汉理工大学学报(材料科学英文版)》2006,21(3):7-11
High temperature wear characteristics of a new hot work die steel CH95 doped with a small amount of rare earth ( Re ) and boron ( B ) have been investigated and compared with those of conventional die steel H11 at a series of temperatures and loads. Worn surfaces of CH95 steel and H11 steel were analyzed with a scanning electron microscope. It is found that high temperature mechanical properties of CH95 steel are much better than those of H11 steel. The oxide layer formed on the worn surface plays an important role in wear resistance at high temperature. When the load is less than 63 N, the surface oxide layer keeps integrated and the effect of load on high temperature wear is small. When the load is higher than 63 N, the supporting ability of matrix to the oxide layer decreases with the increase of load, which results in an increase of wear rate. Compared with H11 steel, the wear resistance of CH95 steel is much better and the worn surface of CH95 steel is smoother. It is easier for CH95 steel to form a compact and integrated surface oxide layer at high temperature than for Hll steel, which protects the worn surface and reduces wear. 相似文献
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孙先明 《武汉理工大学学报(材料科学英文版)》2012,27(1):73-78
The Ni/ZrO2 was used as raw materials to fabricate the surface infiltrated composite layer with 1-4 mm thickness on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicated that the infiltrated composite layer included surface composite layer and transition layer. Wear property was investigated under room temperature and 450 ℃. The results indicated that the abrasion volume of substrate was 8 times that of the infiltrated composite layer at room temperature. The friction coefficient of infiltrated composite layer decreased with the increasing load. The wear resistance of infiltrated composite layer with different ZrO2 contents had been improved obviously under high temperature. The friction coefficient of infiltrated composite layer was decreased comparing with that at room temperature. The oxidation, abrasive and fatigue abrasion was the main wear mechanism at room temperature. Oxidation abrasion, fatigue wear and adhesive wear dominated the wearing process under elevated temperature. 相似文献
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本文利用自制的高温磨损装置,研究5 CrMnMo钢B-Al共渗,B-Zr共渗及渗硼层的高温滑动磨损特性。结果表明,上述渗层的高温滑动磨损机理主要有疲劳剥落、磨粒磨损、氧化磨损和涂抹粘附,并对导致这些磨损机制的原因进行了讨论分析。 相似文献
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燃煤发电厂省煤器管高温冲蚀磨损特性的研究 总被引:1,自引:0,他引:1
利用自制高温冲蚀磨损试验装置,对燃煤发电厂省煤器管道(20钢)进行高温冲蚀模拟试验,并对20钢室温冲蚀以及Ni-W合金刷镀层高温冲蚀作了对比试验。结果表明,局部塑性变形、疲劳剥落、犁削和切削作用是20钢管道高温冲蚀磨损的主要机理。Ni-W合金刷镀层脆性大,结合力不强,不能提高省煤器管道的使用寿命。 相似文献
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铬硼钨钼铌钒系高温抗磨料磨损堆焊焊条的研究 总被引:1,自引:0,他引:1
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。 相似文献
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Microstructure and abrasion wear behavior of Ni-based laser cladding alloy layer at high temperature 总被引:1,自引:0,他引:1
Ni-based alloy coating on 21-4-N heat-resistant steel was prepared using CO2 laser, and the high-temperature abrasion wear was tested. The microstructure of this cladding layer and its abrasion wear behavior at high temperature by changing compositions and temperatures were investigated by means of optical microscope and scanning electron microscope. Among the three compositions of cladding layer, i.e. Ni21 +20% WC+0. 5 % CeO2, Ni25+20 % WC+0. 5 % CeO2 and Ni60 + 20 % WC + 0. 5 % CeO2, the experimental results show that Ni21 + 20 % WC + 0.5?O2 cladding layer is made up of finer grains, and presents the best abrasion wear behavior at high temperature. The wear pattern of laser cladding layer is mainly grain abrasion at lower temperature, and it would be changed to adhesive abrasion and oxide abrasion at higher temperature. 相似文献