共查询到20条相似文献,搜索用时 171 毫秒
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中铬强韧抗磨铸铁的研究 总被引:7,自引:2,他引:7
改变了中铬铸铁的结晶过程,改善和细化了显微组织。其基体为马氏体,主要碳化物为(CrFe)7C3和Cr7C3,还有Fe7C3、Cr23C6、MoC等碳化物和FeMoMn、Fe3MO2等合金化合物,消除了渗碳体(FeCr)3C。其硬度HRC≥56,与高铬铸铁相当,得到了耐磨性和韧性较高的中铬铸铁、因而中铬铸铁磨球的破碎率低,球磨机的生产率较高。所以复合变质处理并热处理后的中铬强韧铸铁是一种低成本的优质的抗磨铸铁。 相似文献
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多元合金化复合变质处理对高铬铸铁锤头组织和性能的影响 总被引:4,自引:0,他引:4
介绍了多元合金化复合变质处理高铬铸铁Cr20MoCu2BNbRETi的化学成分、变质处理工艺,并介绍了多元合金化复合变质处理后高铬铸铁的组织和力学性能的变化,以及采用多元合金化复合变质处理高铬铸铁生产破碎机锤头的生产工艺、生产成本和使用性能。工业试验表明:复合变质处理高铬铸铁锤头的耐磨性是高锰钢锤头的3.65~3.8倍。 相似文献
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稀土钒钛高铬白口铸铁组织与性能的研究 总被引:5,自引:0,他引:5
高铬白口铸铁中加入适量钒钛和稀土复合变质处理后,可使基体组织细化,碳化物形态改善,适当的热处理可使组织性能进一步改善,获得耐磨性与韧性的良好配合。 相似文献
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采用SQY-4型变质剂对硼铬系合金铸铁磨球进行变质处理后,使用了图象分析、X光分析技术研究了变质处理对磨球碳化物形态、类型及分布等的影响;装机应用表明,这种经变质处理的磨球耐磨性可显著提高(10~30%)。 相似文献
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以钨渣铁合金为主要合金原料制造合金铸铁磨球,研究了稀土变质处理提高其使用寿命的可能性。研究结果表明,钨合金铁磨球经适量稀土变质处理后,共晶碳化物由网状分布变城断网状分布,硬度略有提高,冲击韧度、耐磨性和冲击疲劳寿命均显著提高,磨球各项指标明显优于低铬铸磨球,接的字高铬铸铁麻球的水平。 相似文献
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C、Cr、Si、Mn对低铬白口铸铁组织和力学性能的影响 总被引:1,自引:0,他引:1
应用湿砂铸型浇注低铬白口铸铁,采用正交试验研究了C、Cr、Si、Mn对低铬白口铸铁组织和力学性能的影响。结果表明:含碳量2.4%和2.7%时碳化物基本上是呈网状分布的,形成了离异共晶的网状碳化物组织;而含碳量3.0%时,离异共晶组织不再出现。高碳、低硅、高铬和低锰有利于提高硬度;低碳、低硅、中铬和高锰有利于提高冲击韧度;高碳、低硅、低铬和高锰有利提高耐磨性。新开发的低铬白、口铸铁的硬度、冲击韧度和耐磨性远高于目前在生产排沙潜水泵过流部件中所使用材料的各项性能,使用寿命是其5倍左右。 相似文献
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研究了Ce、K、Na复合变质处理对钨白口铸铁组织和性能的影响,提出了评价碳化物变质效果的圆度概念。变质处理后,钨合金白口铸铁的共晶碳化物形态发生了显著变化,在常规热处理条件下,共晶碳化物变成了团球状。由于共晶碳化物形态的改善,钨合金白口铸铁的力学性能(尤其是冲击韧度和抗冲击磨损性能显著提高。对共晶碳化物团球化机理进行了深入分析,并讨论了共晶碳化物团球化对力学性能和耐磨性能的影响。变质钨合金白口铸铁轧辊使用寿命比高铬铸铁轧辊提高20%以上,生产成本降低30%以上,推广应用变质钨合金白口铸铁具有较好的经济效益。 相似文献
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Han-guang Fu Xiao-jun Wu Xue-yi Li Jian-dong Xing Yong-ping Lei Xiao-hui Zhi 《Journal of Materials Engineering and Performance》2009,18(8):1109-1115
The present work studies the effects of titanium carbide (TiC) particle additions on the microstructure and mechanical properties
of hypereutectic high chromium cast iron containing about 20%Cr and 4.0%C by the optical microscopy (OM), the transmission
electron microscopy (TEM), the X-ray diffraction (XRD) analysis, the digital image analysis system, impact tester, and hardness
tester. The carbides of high chromium cast iron are refined gradually and the shape of the primary M7C3-type carbides became more isotropic with the increase of TiC particles. When the addition of TiC particles exceeds 1.0 wt.%,
the change of microstructure is not obvious. The hardness of high chromium cast iron has a slight increase and impact toughness
has a obvious increase with the increase of TiC additions. However, when the addition of TiC particles exceeds 1.0 wt.%, the
impact toughness has no obvious change. 相似文献
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《International Journal of Cast Metals Research》2013,26(1-4):67-70
AbstractWith boron substituting for carbon in cast iron composition and eutectic borides substituting for eutectic carbides in microstructure as the hard wear resistant phase, a new kind of wear resistant white cast iron has been developed. The microstructure and mechanical properties of this new white cast iron both in the as cast state and after appropriate heat treatments were studied. The results show that the as cast microstructure of the boron white cast iron comprises a dendritic matrix and interdendritic eutectics, and the eutectic compound is that of M2B or M′0˙9Cr1˙1B0˙9 type, where M represents Fe, Cr or Mn and M′ represents Fe or Mn. The morphology of the eutectic borides is much like that of carbide in high chromium white cast iron, but the hardness of boride is higher than that of carbide. The matrix in as cast microstructure comprises martensite and pearlite. After austenitising and quenching, the matrix mostly changes to lath type martensite and the eutectic borides remain unchanged. In addition, two different sizes of particles, with different forming processes during heat treatment, appear in the matrix. The boron white cast iron possesses higher hardness and toughness than conventional white cast iron and nickel hard white cast iron, and has a better balance between hardness and toughness than high chromium white cast iron. 相似文献
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M. Filipovic Z. Kamberovic M. Korac M. Gavrilovski 《Metals and Materials International》2013,19(3):473-481
The objective of this investigation was to set down (on the basis of the results obtained by the examination of white cast iron alloys with different contents of alloying elements) a correlation between chemical composition and microstructure, on one hand, and the properties relevant for this group of materials, i.e., wear resistance and fracture toughness, on the other. Experimental results indicate that the volume fraction of the eutectic carbide phase (M3C or M7C3) have an important influence on the wear resistance of white iron alloys under low-stress abrasion conditions. Besides, the martensitic or martensite-austenitic matrix microstructure more adequately reinforced the eutectic carbides, minimizing cracking and removal during wear, than did the austenitic matrix. The secondary carbides which precipitate in the matrix regions of high chromium iron also influence the abrasion behaviour. The results of fracture toughness tests show that the dynamic fracture toughness in white irons is determined mainly by the properties of the matrix. The high chromium iron containing 1.19 wt% V in the as-cast condition, showed the greater fracture toughness when compared to other experimental alloys. The higher toughness was attributed to strengthening during fracture, since very fine secondary carbide particles were present mainly in an austenitic matrix. 相似文献
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采用等离子弧粉末堆焊技术在Q235钢表面分别堆焊高铬铸铁和WC增强型高铬铸铁,通过对各堆焊层的显微组织、化学成分、显微硬度、耐磨性和耐蚀性进行对比分析,揭示WC颗粒对高铬铸铁堆焊层的影响。结果表明,高铬铸铁堆焊层显微组织由初生(Fe,Cr)7C3和共晶组织组成,WC增强型高铬铸铁堆焊层由初生碳化物、WC颗粒和共晶组织组成。与高铬铸铁相比,WC增强型高铬铸铁由于WC的加入,初生碳化物面积分数非常高,共晶组织数量相应减少;WC增强型高铬铸铁的硬度,耐电解腐蚀性和耐热腐蚀性均优于高铬铸铁。两种堆焊层熔合线处的硬度陡降,结合线扫描结果说明,WC的加入不影响WC增强型高铬铸铁堆焊层与基体界面处的冶金结合和堆焊质量。 相似文献