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《铸造技术》2015,(2):412-415
为了研究唐山建龙60 t转炉中高碳钢脱磷的氧化性控制原则,对转炉冶炼终点C-O、Fe-O平衡进行了分析和计算,并对钢液中溶解氧平衡的磷含量和渣中(Fe O)平衡的磷含量进行了计算。结果表明:转炉冶炼终点渣氧化性决定钢液中的磷含量,当终点钢液溶解氧在0.03%到0.045%之间时,[P]-[O]平衡磷含量是(Fe O)-[P]平衡磷含量的21~38倍;终渣(Fe O)含量大于13%,可实现终点磷含量小于0.015%。对于终点碳含量大于0.1%的钢种进行工业实验,通过加料和枪位调整提高终渣氧化性,终点平均磷含量为0.013%,脱磷率提高8%。 相似文献
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The development and advantages of low (1–5% phosporus) phosphorus electroless nickel coating processes is reviewed. Many applications are envisaged for these deposits. 相似文献
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通过周浸加速腐蚀实验、扫描电镜 、拉曼光谱分析等方法,研究了磷含量对低碳钢耐大气腐蚀性能的影响。结果表明,磷能明显提高材料的耐大气的腐蚀性能,这种作用在腐蚀初期尤为显著。其原因是:偏聚在材料表面上的磷原子在水和氧的作用下水解,生成一种致密性较高磷酸盐,并且能均匀覆盖在基体表面的空洞和裂纹处,阻碍了水和氧的通过,使基体免遭进一步的腐蚀。并且H2PO4-能够加速锈层中Fe2+向 Fe3+的转化、使腐蚀初期反应快速进行、阻止铁锈粒子长大,使腐蚀生成物颗粒细小、结构致密。促进了致密、稳定、均匀的保护膜形成。 相似文献
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中子辐照引起的核反应堆压力容器钢中磷的晶间偏析是导致核反应堆压力容器脆性断裂的主要因素之一.本文提出了预测核反应堆压力容器钢中杂质元素(主要是磷)晶间非平衡偏析的溶质拖拽模型,并且与速率理论模型进行了对比.该模型的预测结果与最近发表的压力容器钢(包括C—Mn和MnMoNi钢)的一些实验数据一致. 相似文献
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H. F. Beeghly 《JOM Journal of the Minerals, Metals and Materials Society》1956,8(12):1664-1669
When the radioactive isotope of manganese is not wanted, low manganese steels of 0.10 to 0.15 pet Mn have been made by the basic open hearth process and rolled into plate, bars, and seamless tubing. The low manganese steels are interchangeable with standard grades of carbon steels for many uses. They are superior to standard grades of carbon steels in terms of freedom from strain aging, improved high temperature strength and ductility, and absence of certain disadvantageous nuclear or chemical properties. 相似文献
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ShivaMansoorzadeh FakhreddinAshrafizadeh Xiao-YingLi TomBell 《材料热处理学报》2004,25(5):325-329
Fe-3Cr-0.5Mo-0.3C and Fe-3Cr-1.4Mn-0.5Mo-0.367C sintered alloys were plasma nitrided at different temperatures. Characterization was performed by microhardness measurement, optical microscopy, SEM and XRD. Both materials had similar nitriding case properties. 1.4% manganese did not change the as-sintered microstructure considerably.It was observed that monophase compound layer, γ‘, formed with increasing temperature. Compound layer thickness increased with increasing temperature while nitriding depth increased up to a level and then decreased. Core softening was more pronounced at higher temperature owing to cementite coarsening. 相似文献
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低合金高速钢的应用及发展 总被引:1,自引:0,他引:1
从节省合金资源、节约能源的思路出发,概述了近年来国内外低合金高速钢的发展状况,并对低合金高速钢的应用情况做了阐述,同时指出了目前低合金高速钢在应用及发展上存在的一些不足。 相似文献