共查询到20条相似文献,搜索用时 171 毫秒
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介绍冲天妒熔制铁液获得铸态高强度球墨铸铁QT700-2的方法与生产过程,分析化学成分、脱硫、炉料选用、孕育、球化处理等对冲天炉熔炼获得高强度球墨铸铁的影响.实践表明,降低终硅量,添加Cu元素,优化球化处理工艺,并采用长效孕育剂,冲天炉可以稳定生产铸态QT700-2球铁. 相似文献
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通过对影响高温承压球墨铸铁铸态性能的化学成分、脱硫、球化、孕育处理等因素进行分析,确定合理的控制工艺,在铸态下生产出力学性能满足铁素体基体的球墨铸铁燃汽轮机铸件. 相似文献
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本文通过对影响高温承压球墨铸铁铸态性能因素中的化学成份、脱硫、球化、孕育处理等因素进行分析,确定合理的控制工艺,使得在铸态下力学性能完全满足铁素体基体球墨铸铁的要求。 相似文献
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从配料、装料、熔炼、球化和孕育处理等方面介绍了电弧炉熔炼生产铸态QT450-15球墨铸铁的工艺规范.根据此工艺规范熔炼获得的铸态QT450-15球墨铸铁,具有单一的铁素体基体组织,无自由渗碳体和磷共晶出现,并且铁素体的晶界干净,没有其它夹杂物和相的存在,石墨球圆整,球化率高,球化等级稳定. 相似文献
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介绍了采用球铁回炉料及废钢通过增碳生产优质铸态铁素体球墨铸铁的生产实践,提出了利用增碳工艺不仅可提高铸态铁素体球墨铸铁抗拉强度35MPa左右,而且有效地降低了球墨铸的配料成本。 相似文献
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针对用金属型生产汽车轮毂零件,研究了金属型获得铸态的素体球墨铸铁件的工艺及铸态组织与性能,试验了锰对组织的影响。试验发现,金属铝和石墨对铁水进行预处理以及含铋孕育剂的瞬时孕育,对增加石墨球数和防止表面白口的形成作用十分显著。其铸态力学性能达到了QT450-15的要求。 相似文献
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韩廷意 《中国铸造装备与技术》2014,(1):20-21
铸态球墨铸铁配料用回炉料(包括球铁屑)、废钢的多少直接影响工件的成本,依据球墨铸铁的化学成分,对炉料化学成分含量进行计算,求出所需增碳剂、孕育剂,再配以合理的生产工艺,就可以生产出成本低廉、高质量的铸态铁素体球墨铸铁。 相似文献
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金属型球铁磨球非平衡凝固特性的研究 总被引:3,自引:1,他引:3
探索了金属型球铁磨球非平衡结晶过程,并就磨球的非平衡凝固特性进行了较深入的分析研究。过共晶球铁凝固时出现非平衡奥氏体;亚共晶球铁出现晕圈铁素体和非平衡渗碳体相;在柱状晶与等轴晶过渡区中存在着偏聚物。为改善球铁磨球的显微组织及性能,球铁成分应控制在共晶或稍过共晶处。 相似文献
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An as-cast bainite ductile iron with excellent mechanical properties and wear resistance was fabricated by alloying and centrifugal casting method, and the alloyed chemical composition was optimized by using the thermodynamic software Thermo-Calc. By using optical microscopy, transmission electron microscopy, scanning electron microscopy, and X-ray diffraction, the microstructure of the as-fabricated bainite ductile cast iron was characterized pertinent to the elements distribution in matrix and features of ferrite and retained austenite. The results of mechanical properties test show that the hardness and compressive strength of this alloyed ductile iron are 52 HRC and 2,200 MPa, respectively. The ascast bainite ductile iron possesses highly abrasive wear resistance and the reason can be ascribed to the solid solution of the elements Si, Ni, Cu, and Mn in the austenite and the formation of carbides of elements Cr and Mo. The strength of bainite ductile iron is increased by the acicular bainitic ferrite in the matrix. 相似文献
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阐述了厚壁铁素体球墨铸铁(QT40015)大型筒形铸件———轴流风机叶片承缸精加工椭圆变形矫正的机理,介绍了不需进炉窑,现场用火焰局部加热,并相应施加一定外力,成功实现对椭圆矫正的工艺措施。 相似文献
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EN-GJS-450-10 ductile cast iron was produced with and without vibration to evaluate microstructural features.To investigate the effect of vibration,a reference,and two different castings having amplitudes of 0.9 mm and 1.8 mm were cast with a fixed vibration frequency of 50 Hz.The nodule count (density),form (type),size distribution,nodularity,and the fraction of graphite,percentages of both ferrite and pearlite phases,length of ferrite shell,and pore,were evaluated via optical microscopy using an image analysis software.It is observed that the microstructure of the cast iron is more uniform by vibrational casting than that by non-vibrational casting.Additionally,mechanical vibration enhances nodule count and nodularity,also,more ferritic matrix could be obtained after the application of vibration.Nodule count and nodularity of vibrational casting with 1.8 mm amplitude increased from 226 nodule per mm~2 and 80% to 311 nodule per mm~2 and 86.5% of non-vibrational casting.Percentages of ferrite and graphite area dramatically improved from 24% and 16.5% for non-vibrational casting to 57% and 22.3% for vibrational casting with 1.8 mm amplitude,whereas the percentages of pearlite and pores decreased significantly from 56.1% and 5% to 20% and 1%,respectively. 相似文献
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应用钇基重稀土镁复合球化剂,铸造厚大断面高韧性球铁冷却壁,成功地获得了铸件中心部位铸态高性能。超过了用户要求和美国AC公司的标准。铸件中心部位铸态延伸率≥17%,接近了铸件外层或附铸试块的水平。 相似文献
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