共查询到18条相似文献,搜索用时 203 毫秒
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文中利用金相显微镜、扫描电镜(SEM),探讨了Cr/C对含4%Ni耐磨耐蚀铸铁组织的影响规律.试验结果表明:Cr/C是影响含4%Ni耐磨耐蚀铸铁组织中碳化物数量和形态的主要因素.无论是通过固定Cr,还是固定C来改变Cr/C,都可以大幅度调整组织中碳化物的数量和形态.当Cr含量固定时,随着Cr/C的增加,组织中碳化物数量减少,且由网状向断网状和孤立的条块状转变,冲击断口由脆性加韧性的混合型断裂过渡为韧性断裂;当C含量固定在较低水平时,随着Cr/C的增加,组织中碳化物数量急剧增加,碳化物形态由断网状和孤立的条块状向网状转变,冲击断口由韧性断裂过渡为脆性断裂,但当C含量较高(2.5%)时,随着Cr/C的增加,组织中的碳化物数量增加不明显,且碳化物均为网状结构. 相似文献
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27%Cr高铬铸铁组织及性能研究 总被引:4,自引:0,他引:4
对不同碳、钼含量的27%高铬铸铁的组织、硬度及耐磨性等进行了试验。结果表明:高铬铸铁的淬火硬度及抗磨料磨损能力随含碳量增加而提高。但当铬、碳含量比低于7时,宏观硬度降低。钼对改变大量析出奥氏体的临界含碳量有一定影响,铬、碳含量比低于7时,加钼量不应低于2%。无论含钼或不合钼,过共晶高铬铸铁(3.7%C)抗磨料磨损能力均优于亚共晶高铬铸铁,冲击韧度与后者相近。 相似文献
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本文介绍了不同成分的Mn、Cu、Sn新型低合金耐磨耐蚀铸铁。经研究表明,Mn使Cu在铸铁中的固溶度增加,在Cu含量达到固溶度之前,Cu对硬度的贡献较大。是一种适合于耐蚀又耐磨条件下应用的新型低合金耐磨耐蚀铸铁。 相似文献
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本文通过对Cr28Ni3和Cr15No3铸铁的显微组织、硬度及耐磨性的试验,结果表明950℃1050℃空冷处理后对Cr28Ni3铸铁影响较小,而使Cr15No3铸铁的硬度和耐磨性较大幅度提高。 相似文献
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本文介绍了根据轧辊摩擦系统选择高抗磨材料高铬铸铁,采用分段镶套法修复冷硬铸铁轧辊的工艺。在实验的基础上分析了高铬铸铁的耐磨特性和耐磨铸套的生产工艺特点,提供了一种轧辊修复再生方案,解决了普通冷硬铸铁轧辊耐磨性差,使用寿命短,设备维修费用高的问题。 相似文献
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本文研究了多元微合金化对稀土中锰白口铸铁显微组织、机械性能和抗磨性的影响。实验结果表明:稀土中锰白口铸铁加入多元微合金后,组织细化,韧性和耐磨性提高。生产验证表明:含多元微合金的稀土中锰白口铸铁磨球硬度均匀,球耗量低(60~80克/吨水泥),耐磨性是40Cr锻钢球的2~3倍。 相似文献
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Corrosion and wear resistance characteristics of NiCr coating by laser alloying with powder feeding on grey iron liner 总被引:6,自引:0,他引:6
To reduce the mixed fuel induced excessive wear of the cast iron engine cylinder liners, research on laser alloying of NiCr alloy with powder feeding was performed to locally change both the composition and the microstructure of the liner. The research indicated that laser alloying of 75Ni25Cr on grey cast iron liner demonstrates sound alloying layers free of cracks and porosities. The microstructure of the alloyed layer is composed of pre-eutectic austenite and ledeburite. The alloying element Ni is mainly located in the austenite, while Cr is mainly in cementite. The average hardness is HV0.2500. The corrosion resistance of the alloyed layers in diluted H2SO4 solution and NaOH solution is dramatically improved compared to the grey cast iron. The relative wear resistance of the laser-alloyed 75Ni25Cr layer is 4.34 times of that of the grey cast iron. The improvements on the corrosion and wear resistance of the cast iron are attributed to the composition and microstructure change by laser alloying of 75Ni25Cr. Laser alloying can be a good solution to improve wear and corrosion resistance of the grey iron liners in mixed fuel environment. 相似文献
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A new hammer-mill type impact wear testing facility was built for impact wear testing and characterization. Tests with the hammer-mill impact wear device were carried out on conventional wear resistant materials such as Mn-steels of different compositions, white cast iron, and on new P/M+HIPed wear resistant materials. To verify the validity in using this laboratory wear testing apparatus, wear behavior and worn surfaces obtained on conventional and new Mn-steels generated from this device were compared with wear phenomena and worn surfaces developed in industrial applications, i.e. from certain types of rock crushers. The strain hardening effect in different Mn-steel grades was studied first. Second, the wear resistance of materials with different properties was studied using two different grades of abrasive. With silica sand (high hardness, low compressive strength), conventional Mn-steel and white cast iron perform in a manner comparable with the P/M+HIPed materials. With volcanite sand (low hardness, very high compressive strength), the P/M+HIPed wear resistant materials appear to have the best wear resistance. 相似文献
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Tong Jian-min Sun Ye-ying Zheng Hua-yi Zhang Ching-an Kong Xian-wu 《Tribology International》1985,18(2):101-105
The abrasive wear resistance of composite alloys comprising hard tungsten carbide and soft CuNiMn matrix under different wear conditions has been investigated and compared with CrMo cast iron. It was found that Yz-composite alloy with hard cast angular tungsten carbide has greater wear resistance than CrMo cast iron under two-body wear conditions, but lower resistance than Cr-Mo cast iron under three-body wear conditions. It was found that under three-body wear conditions selective wear of the matrix and digging or fragmentation of tungsten carbide particles dominate in Yz-composite alloy, and microcutting and deformed ploughing is dominant under two-body wear conditions. The abrasive wear resistance of composite alloys under two-body wear condition is independent of bulk hardness, but is closely related to the microhardness of tungsten carbide. 相似文献
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等离子喷涂WC/Co Fe基涂层摩擦与磨损性能 总被引:1,自引:0,他引:1
以普通铸铁为基体,碳化钨陶瓷粉末WC 12Co为热喷涂材料,采用大气等离子法制备WC/Co Fe复合涂层.通过SEM、EDS、XRD等手段对WC/Co Fe涂层微观组织与结构进行表征,并对WC/Co Fe复合涂层耐磨损性能进行测试.结果表明,等离子喷涂制备的WC/Co Fe涂层物相以WC相为主;WC涂层摩擦因数波动小于铸铁材料摩擦因数,表明WC复合涂层具有良好的抗摩擦性能.WC涂层耐磨损性能高于铸铁,主要归因于WC颗粒韧性好、硬度高、抗冲击及抗磨损性能强,与基体金属的结合性好. 相似文献
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A study of sand slurry erosion of W-alloy white cast irons 总被引:1,自引:0,他引:1
This paper reports the results of a study into the effects of the composition, hardness and electrochemical properties of W-group cast irons on sand slurry-erosion resistance and wear mechanisms. The results indicate that the sand slurry-erosion resistance of the irons can be raised by increasing the content of tungsten, especially when the iron is alloyed with chromium. The relation between macrohardness and sand slurry-erosion is intricate. In the low hardness range, the sand slurry-erosion resistance is linearly increased with hardness, but this relationship does not exist in the high hardness range. The sand slurry-erosion resistance of cast iron can be considerably increased by increasing its corrosion resistance. Sand slurry-erosion is an abrasive wear process accompanied by corrosion and cavitation, all of which aggravate each other. 相似文献