共查询到19条相似文献,搜索用时 406 毫秒
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0引言在对球铁的研究中,一般认为高强度球铁应具有珠光体基体,而铁索体基体的球铁只具有高韧性的特点。经反复试验,本厂生产的铸态铁素体基体球铁同时具有高强度和高韧性的特点。1稳定原材料生产铸态球铁,原材料是基础。材料的质量对稳定生产铸态球铁至关重要,必须严格检查验收,并尽可能稳定供货厂家。1.1原生铁生产铸态球铁要求原生铁一高四低(即高碳、低硅、低锰、低磷、低硫),而且还要求含硫量稳定。因为铁液的含硫量直接关系到球化剂的消耗量,从而影响球化效果,影响球铁质量。本厂使用林县合合钢铁厂的214生铁,其化学成分… 相似文献
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铸态高韧性球铁高炉冷却壁断面效应及控制武汉钢铁公司机械总厂(430083)赵书缓大型厚壁铸态高韧性球铁高炉冷却壁[1],其铸型如图所示。由于浇注时铁水是从中间部位的上部和下部引入的,所以经对实物解剖发现,壁件的下部和侧面的力学性能高于上部和内部,同时... 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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Si,Mn对厚断面铸态铁素体球铁组织与机械性能的影响 总被引:2,自引:0,他引:2
在实验室条件下,研究了Si、Mn对厚断面铸态铁大体球铁基体组织及机械性能的影响;确定了铸态高韧性厚断面铁素体球铁与之相适应的Si、Mn含量。 相似文献
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大断面铸态铁素体球铁的组织控制 总被引:1,自引:0,他引:1
试验研究了影响大断面铸态铁素体球铁组织的若干因素。结果表明,即使使用纯度不高的生铁,若控制Si的含量及应用微量元素Sb能完全消除大断面球铁中的碎块状石墨;在超厚壁500mm长方体中心获得完全球化的石墨;抗拉强度大于200MPa,延伸率大于9%,性能已达到原西德Castor标准。 相似文献
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通过锰、铜对铸态高强度高韧性球墨铸铁的机械性能、基体组织和石墨形态作用的一次线性回归分析以及二次孕育作用的研究,得出铸态高强度高韧性球墨铸铁的不同牌号的性能可以通过对球墨铸铁作用较强的合金元素如铜锰或二次孕育的调整来实现.本文回归出在一定的球化条件下,铸态球铁的机械性能和珠光体量的线性关系.结果表明:铜和锰都是球铁中最有利的提高强度的元素,二次孕育的作用在硅低时有利. 相似文献
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铸态高强度高韧性球铁的研制 总被引:1,自引:0,他引:1
采用铜锡做为合金化元素,探讨了不同加铜加锡量对铸态高强度高韧性球铁力学性能和组织的影响,提出了使铸态达σ_(b)600N/mm~2、δ10%、球铁性能的铜锡加入量及其相应的工艺参数。 相似文献
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奥贝球铁具有高强度、高韧性、高硬度、良好的耐磨性以及优良的铸造性能等特点,文章详细阐述了奥贝球铁通过合金化和连续冷却控制技术,使C曲线右移,扩大贝氏体区,避开珠光体区,得到铸态含碳化物的奥贝球铁。铸态CADI首次在轧辊上研制成功,会引起轧辊行业新一轮技术变革。 相似文献
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《中国铸造》2015,(6)
To develop materials suitable for spent-nuclear-fuel containers, the effect of forced cooling on mechanical properties and fracture toughness of heavy section ductile iron was investigated. Two cubic castings with different cooling processes were prepared: casting A was prepared in a totally sand mold, and casting B was prepared in a sand mold with two chilling blocks placed on the left and right sides of the mold. Three positions in each casting with different solidification cooling rates were chosen. In-situ SEM tensile experiment was used to observe the dynamic tensile process. Fracture analysis was conducted to study the influence of vermicular and slightly irregular spheroidal graphite on the fracture behavior of heavy section ductile iron. Results show that the tensile strength, elongation, impact toughness and fracture toughness at different positions of the two castings all decrease with decreasing cooling rate. With the increase of solidification time, the fracture mechanism of conventional casting A changes from ductile fracture to brittle fracture, and that of casting B with forced cooling changes from ductile fracture to a mixture of ductile-brittle fracture. 相似文献
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As-cast and heat-treated 400-18 ductile iron (DI) grade was obtained in different foundry conditions, as metallic charge, Mg-treatment alloy and inoculation. It was found that the Pearlitic Influence Factor (Px) and Antinodulizing Complex Factor (K1) have an important influence on property of DI, depending on the Mn and P level, the metallurgical quality of iron melt, rare earth (RE) and inoculation. It was also found that the influence of Mn is depended on the phosphorus and residual elements level in ductile iron. Less than 0.03%P and 0.2%Mn and Px<2.0 are the basic conditions to obtain as-cast ferritic structure. At the same lower level of Mn and P, the increasing of residual elements (Px>2.0) determines presence of pearlite in as-cast structure, while ferrite structure is obtained after a short annealing heat treatment. Lower level of phosphorus (P<0.025%) and residual elements (Px<2.0) allow to use relative high Mn content (0.32%-0.38%), in condition of ferritic structure, including in as-cast state. High P (0.04%-0.045%) and Mn (0.25%-0.35%) content stabilized pearlite, especially at lower level of residual elements (Px <2.0). Antinodulizing action of elements was counteracted up to K1=2.0 level, by RE included in Mg-treatment alloy, which are beneficial for K1<1.2 and compulsory for K1>1.2. Si has a significant influence on the mechanical properties of heat treated ductile irons an important decreasing of elongation level and a moderate increasing of yield and tensile strength and their ratio in 150-170 HB typical hardness field. A typical final chemical composition for as-cast 400-18 ductile iron could include 3.5%-3.7%C, 2.4%-2.5%Si, max.0.18%Mn, max.0.025%P, max.0.01%S, 0.04%-0.05%Mgres.for Px<1.5 and K1<1.1. High purity pig iron, RE-bearing FeSiMg and powerful inoculant are also recommended. 相似文献
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利用自行研制的喷粉装置,首先探讨了厚大断面RE-Mg球铁喷粉脱硫净化的效果,然后研究了稀土镁球化剂在喷粉处理时的净化及球化效果,进而对喷粉脱硫、球化、孕育综合处理工艺进行了试验研究。结果表明:喷粉处理时活性CaO的脱硫率与CaC2的脱硫率相近,使得CaO取代CaC2成为可能,喷粉处理具有突出的净化作用,在脱硫的同时,使氧含量显著降低,同时使硫趋于均匀分布;喷粉球化是一种有效的新球化方法,可获得低硫、低氧、石墨圆整而细小的铸态铁素体球墨铸铁;综合喷粉球化工艺可将脱硫剂、球化剂、孕育剂同时喷入铁液,完成脱硫、球化、孕育过程,获得的球铁在强度较高的同时,使伸长率和冲击值也增大。 相似文献
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