共查询到17条相似文献,搜索用时 184 毫秒
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真空炉法生产高氮氮化锰工艺及产品结构分析 总被引:1,自引:0,他引:1
氮化锰是高氮钢冶金领域应用的重要材料。利用大容量轨道式真空电阻冶炼炉系统,经过预处理的电解金属锰在较高真空度的炉内升温,与高纯氮气进行锰、氮化学反应,生成氮化锰产品。通过工艺过程分析及产品结构分析,产品主要为Mn4N等化合物,根据产品含量检测,此工艺生产得到的氮化锰中氮含量高达8%~10%,可称为高氮氮化锰,其产品性能明显优于现有的氮化锰产品。 相似文献
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为研究金属锰粉的渗氮机理,采用热重分析法分别研究了等温和非等温条件下的氮气中,不同粒度的金属锰粉的氮化反应动力学。研究表明:金属锰粉发生氮化反应的起始温度和氮化锰的分解温度分别为470℃和1 016℃。同一粒度下,随着温度升高,表观速率常数增大,但饱和氮含量反而下降,出现吐氮现象;同一温度下,锰粉粒度越小,氮化速率越快,达到平衡的时间越短。金属锰粉粒度从40目降到100目,氮化反应的表观活化能从189.2 kJ/mol降低到115.2 kJ/mol。不同温度下和不同粒度金属锰粉的氮化过程中界面化学反应是整个过程的控制步骤。 相似文献
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Eui-Jun Kim Jong-Jin Pak Byung-Don You 《Metallurgical and Materials Transactions B》2001,32(4):659-668
The nitrogen solubilities in liquid manganese, manganese-iron, manganese-carbon, and manganese-iron-carbon alloys have been
measured by the gas-liquid metal equilibration technique in the temperature range of 1623 to 1823 K. The equilibrium nitrogen
content in pure liquid manganese at an atmospheric nitrogen pressure is high, and it does not follow Sievert’s law, i.e., f
N is not unity. The reduced nitrogen partial pressures by dilution with argon enabled us to obtain more reliable information
on the thermodynamics of nitrogen in liquid manganese. The nitrogen dissolution follows Sievert’s law at nitrogen contents
below 1 wt pct. The standard free-energy change for the dissolution of nitrogen in pure liquid manganese has been determined
as −67,222+30.32T J/g atom, with the standard state of nitrogen taken as a 1 wt pct solution. Carbon and iron in manganese-rich melts decrease
the nitrogen solubility significantly. The first- and second-order interaction parameters between nitrogen and other elements
in manganese alloy melts have been determined. The activity coefficient of nitrogen in a ferromanganese alloy melt can be
expressed as
where the interaction parameters are independent of temperature in the temperature range of 1623 to 1823 K. 相似文献
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K. N. Vdovin N. A. Feoktistov E. V. Sinitskii D. A. Gorlenko N. A. Durov 《Steel in Translation》2015,45(10):729-732
An improved oxidative production technology for 110Г13Л manganese steel in a 25-t arc furnace is considered. The basic periods of the process are described. The slag conditions in steel production are discussed. The activity of oxygen in the metal is assessed on the basis of practical data regarding the slag composition in the oxidative and reductive periods. The oxygen activity in the metal is plotted as a function of the total content of manganese and iron oxides in the slag. In addition, a method is proposed for determining the required aluminum content for reduction of the metal, so as to obtain the required quantity in the final melt. The influence of the steel’s aluminum content on its impact strength is investigated. 相似文献
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高性能锻轧锰产品生产工艺所采用的方法为二次重结晶压力粉末锻,采用高强度液压式锻轧设备,将金属锰粉末在瞬间压制成型,并将成型锻轧锰置入真空烧结炉进行烧结。高性能锻轧锰产品比其它锰产品在合金均匀化、回收率、产品质量指标等方面均达到了较好的效果。 相似文献
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The extraction of manganese from the tailings slag obtained in the production of refined manganese ferroalloys is studied thermodynamically and experimentally. In such extraction, the slag reacts with metal melts (hot metal, ferromanganese, and ferrosilicomanganese) containing reducing elements (carbon and silicon), with the goal of increasing the overall transfer of manganese to the final manganese ferroalloys. According to the results, the reduction of manganese by carbon only occurs in the case of hot metal. A method is developed for alloying hot metal with manganese from tailings slag obtained in the production of refined manganese ferroalloys. 相似文献