稀土在钢中的应用

本文阐述稀土在钢中的作用机理和加入方法,分析了稀土应用的前景。对钢液进行稀土处理是我国发展钢产业的重要技术手段之一。     

Morphology and Forming Mechanism of Rare Earth Inclusions During Solidification of Steel

ＭｏｒｐｈｏｌｏｇｙａｎｄＦｏｒｍｉｎｇＭｅｃｈａｎｉｓｍｏｆＲａｒｅＥａｒｔｈＩｎｃｌｕｓｉｏｎｓＤｕｒｉｎｇＳｏｌｉｄｉｆｉｃａｔｉｏｎｏｆＳｔｅｅｌ￥ＺｈａｉＱｉ－Ｊｉｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌｌｕｒｇｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＳ...     

稀土对耐热钢高温性能的影响

通过对真空持久试样断口表面的离子探针分析,证明稀土偏聚晶界,增加了晶界的强度,改善了钢的热强性和热塑性。用同位素方法试验表明,稀土提高了钢中铬的扩散速度,促进了Cr_2O_3保护膜的形成。用SEM、EDEX、ICP及X光等方法对合金表面氧化皮进行的研究表明,钢中加入稀土改变了氧化皮结构,细化了晶粒,抑制或延缓了氧化皮与基体界面空洞的形成,使氧化皮不易开裂和脱落,改善了钢抗氧化性。     

The Rare Earth Aluminium Alloys in China

The development and application of rare earth aluminium alloys began in the 1960s in China.The represen-tative work was the usage of rare earth metals in alumino-silicon alloys for piston.In the 1970s,its initial stage.rare earths were used in enhanced AIMgSi alloy transmission line and FeCr Al alloy electric heating wire.Duringits developing period(from 1980 to 1985),in the field of smelting,after the electrolytic preparation of RE-Almaster alloys at relatively low temperature,a new technique was invented that rare earth compounds were addedto commercial aluminium electrowinning cell to produce RE-Al alloys directly.It opened the way for the appli-cation of rare earths in industry on a large scale.In the field of application,it was found that the addition ofrare earths could improve the conductivity and processing property of aluminium alloys.The application of rareearths to aluminium conductors and products had made a breakthrough progress.Since 1986,its golden age,thestudy,production and application of aluminium alloys containing rare earths have been developing at an amazingspeed,running neck and neck with the application of RE in agriculture,textile dyeing,and cast iron.     

加速发展我国稀土在钢中应用研究

论述了近年来我国稀土处理钢的生产状况及稀土在钢中作用规律与作用机理的研究进展,对加快稀土在钢中应用研究工作的发展提出了建议。     

稀土对20MnVB钢组织性能的影响

本文试验研究了稀土对２０ＭｎＶＢ钢硫化物和氧化物的变质作用，以及对组织和性能的影响。结果得出ＲＥ／Ｓ为１．８～２．５时，２０ＭｎＶＢ钢具有最佳的组织和综合性能。     

09CuPTiRE钢板坯连铸时结晶器喂稀土丝的应用

试验了铸速 0 .70～ 0 .90m min结晶器喂直径 2 .5mm稀土丝的 0 9CuPTiRE钢板坯连铸工艺。稀土在 1 2 5 0mm× 2 0 0mm板坯上分布均匀 ,最大值为 0 .0 39% ,最小值为 0 .0 2 6 % ,稀土回收率≥ 80 % ,显著改善0 9CuPTiRE钢板的横向冲击性能     

Effect of Rare Earth Elements on Low Frequency Fatigue of Hot Rolled Steel 60CrMnMo at High Temperature

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＬｏｗＦｒｅｑｕｅｎｃｙＦａｔｉｇｕｅｏｆＨｏｔＲｏｌｌｅｄＳｔｅｅｌ６０ＣｒＭｎＭｏａｔＨｉｇｈＴｅｍｐｅｒａｔｕｒｅＹａｎｇＱｉｎｇ－Ｘｉａｎｇ（杨庆祥）；ＷｕＨａｏ－Ｑｕａｎ（吴浩泉）；Ｇｕ...     

合金钢的稀土金属微合金化研究

研究了稀土在合金钢中固溶的因素以及稀土对钢的组织性能、相变参数的影响，探讨了固溶稀土的微合金化作用。结果表明，经稀土处理后，钢中存在2×10-6～33×10-6的固溶稀土，其分布规律是晶界多于晶内，珠光体多于铁素体；固溶稀土还促使钢的相变点升高，C-曲线右移；提高了钢的强度和硬度。     

Effect of Rare Earth Elements on Low Frequency Fatigue Cyclic Softening of Hot Rolled Steel 60CrMnMo at High Temperature

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＬｏｗＦｒｅｑｕｅｎｃｙＦａｔｉｇｕｅＣｙｃｌｉｃＳｏｆｔｅｎｉｎｇｏｆＨｏｔＲｏｌｌｅｄＳｔｅｅｌ６０ＣｒＭｎＭｏａｔＨｉｇｈＴｅｍｐｅｒａｔｕｒｅＹａｎｇＱｉｎｇｘｉａｎｇ；ＷｕＨａｏｑｕａｎ...     

Research and Development of Rare Earth Advanced Materials in China

ＲｅｓｅａｒｃｈａｎｄＤｅｖｅｌｏｐｍｅｎｔｏｆＲａｒｅＥａｒｔｈＡｄｖａｎｃｅｄＭａｔｅｒｉａｌｓｉｎＣｈｉｎａＷａｎｇＤｉａｎｚｕｏ（王淀佐），ＷａｎＱｕｎ（万群），ＹａｎｇＹｕｃｈｕｎ（杨遇春）（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ...     

黑色风化物的物理化学性质及稀土配分研究

某稀土矿产生的黑色风化物，是一种稀土以胶态相赋存的新稀土资源。黑色风化物主要由锰、铁，稀土和铅组成，形成锰铁氧化物非晶质的高聚合度无机高分子。黑色风化物强烈地选择铈族轻稀土，与矿区产的矿石和氟碳铈矿稀土配分相近，但黑色风化物含中重稀土最高，矿石次之，氟碳铈矿最低。     

Study on the Formation of Crystalline Rare Earth Carbonates from Rare Earth Ore Leaching Liquors

The crystalline precipitate of rare earth carbonates has been produced by the ammonium bicar-bonate precipitation method in the recovery of RE from the ammonium sulfate leaching liquor of the weath-ered leach-deposited rare earth ore.Various influencing factors such as time,temperature and reagent con-centration have been studied.And chemical analysis,XRD,SEM,IR spectrography,TGA and DTA havebeen used to analyze and examine the crystalline RE carbonates.Good results were obtained.     

稀土在12MnReHP钢中的应用

通过大生产试验,阐述了稀土在钢中的作用,确定了稀土金属合理的加入方法和加入量,通过对比,检验分析了１２ＭｎＲｅＨＰ钢中夹杂物数量、形状、分布以存在形式。     

Geochemical Characteristics of Rare Earth Elements in Different Types of Soils in China

ＧｅｏｃｈｅｍｉｃａｌＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｉｎＤｉｆｅｒｅｎｔＴｙｐｅｓｏｆＳｏｉｌｓｉｎＣｈｉｎａＷａｎｇＬｉｊｕｎ（王立军），ＺｈａｎｇＳｈｅｎ（章申），ＧａｏＸｉａｏｊｉａｎｇ（高效江），Ｌｉｕ...     

Development and Application of a Heat-resistant Low Ni Steel Modified by Rare Earth for Furnace Roller

The low Ni steel modified hy rare earth(3Cr24NiTSiN with an addition of 0.3% Ce)for furnace roller hasbeen developed.Due to the RE(rare earth)addition,a dense oxide film is formed on the steel surface at hightemperature,and the oxidation rate is decreased.This film has so good adhesion to the matrix that it will not bepeeled off easily.The RE modified steel has excellent oxidation resistance and thermal strength even if beingused continuously for a long period at high temperature.This steel roller has a service life of about 4 years com-parable to high Ni steel ones,so the low Ni steel can replace high Ni steel to make furnace roller.The Ni contentof this material can be reduced by 65% in comparison with Cr25Ni20Si2 steel,The low Ni steel has better pro-eessing properties including melting,casting and working properties than that of high Ni ones.     

稀土热稳定剂在聚氯乙烯塑料中的应用前景

本文对稀土热稳定剂的发展、应用、特点、稳定机理以及发展前景做了详尽的综述。确定烯土化合物是一种可以替代传统热稳定剂的新型热稳定剂。该稳定剂无毒、价廉、稳定效果好、制品性能优异，具有广阔的应用前景。     

稀土在钢中的应用及需注意的一些问题

本文叙述了稀土在钢中应用的概况.总结了稀土对钢的净化、变质和合金化作用.强调了钢水质量、稀土加入方法、炼钢工艺等前提条件对稀土在钢中应用效果的影响.对稀土钢的开发、基础理论研究以及在钢中使用稀土应具备的条件提出了建议.     

Observation and Analysis of the Microstructure in CarburizedSurface Layer of Steel 20Cr2Ni4A Treated with ConventionalAnd Rare Earth Carburizing Processes

ＯｂｓｅｒｖａｔｉｏｎａｎｄＡｎａｌｙｓｉｓｏｆｔｈｅＭｉｃｒｏｓｔｒｕｃｔｕｒｅｉｎＣａｒｂｕｒｉｚｅｄＳｕｒｆａｃｅＬａｙｅｒｏｆＳｔｅｅｌ２０Ｃｒ２Ｎｉ４ＡＴｒｅａｔｅｄｗｉｔｈＣｏｎｖｅｎｔｉｏｎａｌＡｎｄＲａｒｅＥａｒｔｈＣａｒｂｕｒｉｚｉ...     

Effect of Rare Earth Fluoride Complex Additives on Properties of Steel

A technique of treating steel with rare earth fluoride complex additives(REFCA),effects andinflunce factors have been studied.REFCA play a role on controlling inclusion morphology,purifying themolten steel and improving properties of steel.The optimum composition of REFCA is REF_3 42%;CaO33%;SiCa 25%,and the amount of REF_3 is 0.5 wt%～0.6 wt% of steel.