共查询到17条相似文献,搜索用时 62 毫秒
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对氮化钒的用途、生产工艺、生产设备及国内氮化钒的生产情况进行了介绍。从目前国内氮化钒生产情况可知,国内氮化钒目前呈现出众多厂家在纷纷上马和扩张,增势迅猛,拥有钒资源的企业将占领氮化钒的市场高地。 相似文献
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目前一直被美国所垄断的氮化钒生产技术及产品市场 ,有望不久在攀钢变为国产化的现实。由攀枝花钢铁研究院负责的“用三氧化二钒制取氮化钒技术研究” ,现已完成半工业试验 ,进入与设计、制造厂家联合攻关时期 ,计划 2 0 0 0年底研制出符合攀钢工艺特点的工业生产设备。氮化钒作为炼钢添加剂原料 ,与使用高钒铁相比 ,既可以少用 2 0 %的钒 ,又可以提高钢材的强度。由于氮化钒生产技术难度大、工业化成本高 ,致使国内外产业化进程步履艰难 ,只有美国独霸天下。攀钢科技人员以开发具有中国人自主知识产权的氮化钒产品为己任 ,在国外严密封锁技… 相似文献
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承钢冶炼三级钢试验了钒铁、氮化钒和氮化钒铁3种不同的钒合金,钢筋性能均满足用户要求。通过对比分析其成分控制,认为对于钒吸收率,氮化钒铁最高、氮化钒次之、钒铁最低。对比其钢筋性能,在碳当量相同时,认为加氮化钒的钢筋其屈服强度和抗拉强度最高,氮化钒铁次之,钒铁最低,对低成本冶炼三级钢具有指导意义。 相似文献
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A. Horsewell 《Metallurgical and Materials Transactions A》1978,9(12):1843-1847
The inhibition of creep in a vanadium alloyed austenitic stainless steel has been found to rely upon heterogeneous precipitation
of vanadium nitride both on matrix and grain bound-ary dislocations together with the formation of M23C6 grain boundary carbides. The effect of these precipitation reactions on the separate stages of the creep test has been investi-gated
microstructurally, particularly with reference to the processes occurring at grain boundaries. Dislocation configurations
in grain boundaries, especially in the region of grain boundary carbides are modified by the presence of vanadium nitride
precipitates. It is suggested that the roles of M23C6 and vanadium nitride precipitation during creep of this steel are interrelated and complimentary in reducing creep rates
and extending creep ductility. 相似文献
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A. N. Rylov A. Yu. Raikov A. V. Martynov V. M. Chumarev A. V. Larionov N. I. Sel’menskikh 《Russian Metallurgy (Metally)》2013,2013(7):477-481
The possibility to use aluminum nitride as a nitriding agent for out-of-furnace aluminothermic melting of V-Al-N master alloys is studied and tested. It has been found that the replacement of nitrided vanadium by aluminum nitride in a charge for melting does not change the phase composition of the master alloy and the uniformity of the distribution of nitride inclusions in the ingot volume. The nitrogen-containing phase of the V-Al-N master alloy is represented by aluminum nitride. The mean values of the structural parameters of the master alloys melted from charges containing nitrided vanadium or aluminum nitride are identical. 相似文献
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Mamdouh Eissa Kamal EI-Fawakhry Mohamed Mekkawy Abdul Hamid Hussein Ahmed Tawfik 《国际钢铁研究》1998,69(8):334-342
With the objective of studying the effect of vanadium and nitrogen microalloying on microstructure and strength of low carbon steels with different manganese contents, three series of low carbon steels (0.1% C) with manganese content (between 0.8 and 3.5%), vanadium content (up to 0.17%) and nitrogen content (up to 0.025%) have been designed and investigated in the hot forging condition using a preheating and finish forging temperatures of 1200 and 950°C, respectively. Steels with a manganese content up to 2.3% revealed ferrite-pearlite structures, whereas higher manganese contents from 2.7 to 3.5% resulted in the formation of bainitic structures. A pronounced effect of manganese on the mechanical properties of steels was detected at lower manganese contents < 1.5%, due to solid solution and grain refining effects, and higher manganese contents > 2.3, due to bainite formation. Manganese content in the range of 1.5-2.3% had less pronounced effect due to solely solid solution hardening. Vanadium microalloying effectively increased the strength of steels through solely precipitation strengthening or both precipitation strengthening and grain refining effect. The effectiveness of vanadium was greatly enhanced by increasing the nitrogen content. The grain refinement of vanadium-nitrogen microalloying seems to be due to inhibition of austenite grain growth as a result of precipitation of vanadium nitride in austenite during forging. Precipitation strengthening of these steels is achieved by precipitation of vanadium carbide and nitride in ferrite or bainite. Nitrogen enhanced the precipitation strengthening of vanadium microalloyed steels which could be attributed to the finer vanadium nitride dispersion precipitates compared with vanadium carbide. Up to 70% of the total nitrogen content of steel precipitates as vanadium nitride which could be achieved with V/N ratio of about 6-7. Microalloying of low carbon-manganese steels (0.1% C and 1.8% Mn) with 0.15% vanadium and 0.025% nitrogen was found to be effective in attaining high levels of yield and ultimate tensile strengths of 835 and 940 N/mm2, respectively in the forging condition. 相似文献
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还原氮化五氧化二钒制备氮化钒的研究 总被引:2,自引:0,他引:2
对还原氮化制各氮化钒的过程进行了理论分析和实验探讨。结果表明,五氯化二钒还原过程中同时发生了直接还原和间接还原,在高温氮化条件下巳生成的氮化钒又转化为碳化钒。本试验条件下直接还原的开始温度为656K,氮化的开始温度为1160K,氮化钒转化为碳化钒的温度为1560K。间接还原发生的可能性与配碳系数有关,配碳系数越大,其发生的可能性越大。 相似文献
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Metallurgical and Materials Transactions B - Enhanced nitrogen in steels containing vanadium causes fine precipitates of vanadium nitride, which improve the hardenability properties. However,... 相似文献