共查询到19条相似文献,搜索用时 171 毫秒
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从改善低铬白口铸铁碳化物形貌出发,研究了稀土变质处理和热处理的作用。结果表明:综合运用稀土变质处理和热处理是改善低铬白口铸铁共晶碳化物形貌、提高综合力学性能的有效途径。 相似文献
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硬镍合金铸铁是一种良好的抗磨材料,但由于其碳化物呈网状和组织粗大,使其韧性低和性能不够稳定。为此,研究了稀土变质处理对硬镍合金铸铁组织和性能的影响。试验结果表明,稀土变质处理,可使硬镍舍金铸铁的碳化物呈块状或片状,组织得到明显细化与均匀化,并增加马氏体含量。因此,稀土硬镍合金铸铁具有良好的综合机械性能和较高的抗冲蚀磨损性能,具有广阔的应用前景。 相似文献
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含钨白口铸铁共晶碳化物团球化研究 总被引:1,自引:0,他引:1
研究了Ce、K、Na复合变质处理对含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,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。变质处理后,由于共晶碳化物形态的改善,含钨白口铸铁的力学性能,尤其是冲击韧性大幅度提高,抗冲击磨损性能也显著提高。经变质处理的含钨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。 相似文献
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稀土变质处理改善耐磨铸铁的组织与韧性 总被引:1,自引:0,他引:1
研究了稀土变质处理对耐磨铸铁显微组织及冲击韧性的影响.结果表明,稀土变质能使铸铁的网状碳化物断开,冲击韧性提高,尤其变质后再经热处理,效果更明显. 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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The paper presents the results of tests on the spheroidising treatment of vanadium carbides VC done with magnesium master alloy and RE. The conducted metallographic studies have shown that introducing the magnesium master alloy to an Fe–C–V system of eutectic composition causes the crystallisation of spheroidal carbides. The content of these carbides is about 5.6%, representing 33% of all the crystallised vanadium carbides. Adding RE to the base alloy melt caused 31% of the vanadium carbides crystallise as dendrites. Testing of mechanical properties has proved that the spheroidising treatment of VC carbides in high-vanadium cast iron increases the tensile strength by about 60% and elongation 14–21 times, depending on the type of the spheroidising agent used. Tribological studies have shown that high-vanadium cast iron with eutectic, dendritic and spheroidal carbides has the abrasive wear resistance more than twice as high as the abrasion-resistant cast steel. 相似文献
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稀土元素对耐磨铸铁力学性能的影响 总被引:9,自引:0,他引:9
采用金相、扫描电镜和力学性能分析方法研究了稀土元素及其添加量对耐磨铸铁力学性能的影响。结果表明:稀土能提高耐磨铸铁的力学性能,尤其与热处理共同作用时,效果更显著,其原因主要归于碳化物由连续网状转变为独立的块状。 相似文献
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Eutectic modification in a low-chromium white cast iron by a mixture of titanium,rare earths,and bismuth: I. Effect on microstructure 总被引:2,自引:0,他引:2
A. Bedolla-Jacuinde S. L. Aguilar B. Hernández 《Journal of Materials Engineering and Performance》2005,14(2):149-157
The present work studies the effect of small additions of a mixture of Ti, rare earths (RE), and Bi on the eutectic solidification
of a low-Cr white cast iron (WCI) commercially designed as Ni-Hard Class I Type B according to the ASTM A532. For this purpose,
systematic additions of a mixture of ferrotitanium-rare earths-bismuth (Fe-Ti-RE-Bi) up to 2% were made to a low-Cr WCI. By
means of these additions, a modified carbide structure was obtained. Eutectic carbides changed from a highly interconnected
ledeburite structure to more isolated, finer blocky structure. This microstructural change caused variations in the mechanical
behavior of the WCI. The decrease in size and reduced connectivity of the eutectic carbides increased fracture toughness as
well as wear resistance under dry sliding conditions. The effect of the admixture on the microstructure and mechanical properties
is discussed in terms of the segregation and refining effects of the elements that comprise the mixture. 相似文献
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鉴于球磨机磨球使用寿命偏低,对一种磨球用低合金铸铁进行了变质处理和热处理,并对其显微组织、硬度和冲击韧度进行了检测。结果表明,变质处理结合热处理能改善低合金铸铁的组织,降低脆性,有效提高其力学性能。经稀土变质处理后再经970℃保温2 h空冷后,低合金铸铁的硬度和冲击韧度分别为44.7 HRC和4.94 J·cm-2,比铸态样品的硬度和冲击韧度分别提高了4.68%和56.83%。 相似文献
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变质处理对高铬铸铁组织及性能的影响 总被引:2,自引:0,他引:2
研究了变质处理对含Cr12%-13%(Cr≤5)的高铬铸铁组织及性能的影响。试验结果表明:采用稀土、钒、钛、硼元素复合变质处理对细化晶粒,改变碳化物形态,提高冲击韧性和耐磨性有显著效果。 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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