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EffectsofRareEarthsontheTemperingTransformationKineticsofHighCarbonSteelLinQin(林勤);FuTing-Ling(付廷灵);DuYuan-Sheng(杜垣胜)YuZong-S... 相似文献
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The mechanism and influence factors of thermal decomposition of NH_4VO_3 in Ar to produce V_6O_(13)were investigated by TG-DTG, DSC, X-ray diffraction and orthogonal design experiments at 25~450℃.Theprocess includes four reactions, among which the reduction of V_2O_5 by NH_3 is one of the most importantstagrt controlling the constituents of the fina1 products, and it is affected by heating rate and amount ofNH_4VO_3 singnificantly. This reduction reaction is controlled by a first order reaction or nucleation and nucleigrowth with a kinetic equation--ln(l-a)=kt,and apparent activation energy of 410kJ/molis obtained. 相似文献
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The contents of rare earth metals(REM) insolid solution in 16 Mn steel were determined bymeans of inductive coupling plasma (ICP)spectroscopy.The amount of REM in solid solutionis only a few ppm in the steel with MnS inclusions,which rises slightly with the increasing of REMcontent in steel.At RE/S>1.9,the MnS inclu-sions in steel disappear completely,the REM con-tent in solid solution increases rapidly with the in-creasing of REM content.The solubility of ceriumin 16 Mn steel(st 52)is less than 0.011 wt—% atroom temperature.The results obtained indicate that REM in sol-id solution reduce the amount of pearlite and in-crease that of ferrite and its microhardness.Dis-solved REM oculd increase temperature of criticalpoints,alleviate band structnre and suppressgrowth of austenite grains. 相似文献
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中心注管钢流中加稀土的试验生产表明,钢中稀土可腐蚀中注管和汤道的粘土质耐火材料,并随稀土加入量和加入时间的增加而加,剧腐蚀产物中SiO2、Al2O3逐渐减少或消失,REAlO3,RE-Al-Si-O,RE2SiO2等复合氧化物相依次出现,腐蚀层逐渐增厚。稀土与耐火材料反应对钢中夹杂物有一定影响,中注管部位出现大型外来RE-Al-Si-O复合夹杂,但能被汤道耐火材料及保护渣吸收,本稀土处理工艺可使钢 相似文献
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