Effects of RE-Sb on Gray Cast Iron

ＥｆｆｅｃｔｓｏｆＲＥ－ＳｂｏｎＧｒａｙＣａｓｔＩｒｏｎＸｉｏｎｇＺｈｏｎｇ－Ｍｉｎｇ（熊仲明）；ＺｈａｎｇＳｕｏ－Ｍｅｉ（张锁梅），ＳｈｉＤｏｎｇ－ｙａ（石东崖）；ＳｏｎｇＷｅｉ－Ｘｉ（宋维锡）（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｉｌｕｒｇｙ，Ｕｎｉ...     

Effects of RE and N on Properties of Corrosion Resistance and Oxidation Resistance of Gray Cast Iron

ＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｔｈｅｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｇｒａｙｃａｓｔｉｒｏｎｃａｎｂｅｉｍｐｒｏｖｅｄｂｙａｄｄｉｎｇｓｕｉｔａｂｌｅａｍｏｕｎｔｏｆＲＥａｎｄＮ．Ｔｏｈｉｇｈｃａｒｂｏｎｅｑｕｉｖａｌｅｎｔ（ＣＥ）ｇｒ...     

Effects of Light and Heavy Rare Earths on Anti-Degradation of Nodular Cast Iron

The effects of rare earths with different contents on anti-degradation of Y base heavy rare earths-magnesium and cerium base light rare earths-magnesium nodular cast iron were studied. Curves of the relationship between the spheroidization grade of liguid iron treated by different nodulizers and holding time were obtained. The results show that the more the remains of the rare earth, the longer the anti-degradation time, the liquid iron was treated either by Y-Mg-Si or by Ce-Mg-Si nodulizer. When the rare earth remains are above certain quantity, the spheroidization grade starts to decline. When liquid iron treated by either Y-Mg-Si or Ce-Mg-Si nodulizer with proper remains of rare earths about 0.04% 0.06%（mass fraction）, the anti-degradation is the best, and the remains of Mg being about 0.04% -0.07% （mass fraction）. Rare earths-Mg nodulizer with moderate RE remains is better than that of Mg-Si nodulizer in anti-degradation property. However, Y-Mg-Si nodulizer with moderate remins of Re is better than Ce-Mg-Si nodulizer. Sometimes Ce-Mg- Si nodulizer can be used for the production of heavy section nodular cast iron.     

Effects of Rare Earths and Al on Structure and Performance of High Chromium Cast Iron Containing Wolfram

High chromiumcast ironis ani mportant grade ofwear-resistant material.It exhibits high hardness,ex-cellent wear resistance,andlowdeflection onrupture.Moreover,combined properties of high chromiumcastiron are better than that of other white cast irons.Therefore,it has many applications[1~4]in concrete,electric power,mine,metallurgy,and especially ap-plicationin ball mill with large diameter subjected toheavy i mpact loading[5].However,the brittle natureof this material often causesfailure under…     

稀土对高Ni-Cr铸铁石墨的变质作用

采用金相和电镜等手段对稀土在高Ｎｉ－Ｃｒ铸铁中的行为进行了研究。结果表明：稀土可以改善高Ｎｉ－Ｃｒ铸铁石墨的形态及分布，使之由长条状向短厚状过渡。并且随着稀土加入量增多，石墨数量增加。     

稀土对球墨铸铁中共存As、Sn、Pb、Ti的中和作用

全部采用龙岩生铁，制取球墨铸铁。球化剂为镁硅铁合金，同时分别添加０．００％、０．０１％、０．０２％、０．０３％、０．０４％、０．０５％、０．０７％稀土硅铁合金进行球化处理。结果表明，稀土不能完全消除与中和高含量微量元素共存对石墨球化的干扰作用。但适量稀土可部分中和微量元素、促进形核、改善球状石墨的表面形貌。削弱微量元素的有害作用。     

Effect of Rare Earths on Tempered Martensite Embritlement of Steel

ＥｆｅｃｔｏｆＲａｒｅＥａｒｔｈｓｏｎＴｅｍｐｅｒｅｄＭａｒｔｅｎｓｉｔｅＥｍｂｒｉｔｌｅｍｅｎｔｏｆＳｔｅｌＧａｏＧｕｏｚｈｏｎｇ（高国忠），ＨｅＷｅｉｙｏｎｇ（贺维勇），ＧａｏＪｕ（高炬），ＣｈｅｎＪｉｚｈｉ（陈继志）（ＩｎｓｔｉｔｕｔｅｏｆＭ...     

Research on Thermal Wear of Cast Hot Forging Die Steel Modified by Rare Earths

Thermal wear of cast hot-forging die steel modified by rare earths（RE） was studied and compared with commercially used die steels. The function of RE and the mechanism of thermal wear of cast steel modified by RE were discussed. The results showed that with increasing content of RE, the wear rate of cast steel reduced at first and then increased. By adding 0.05% （mass fraction） RE, the cast hot-forging die steel with optimum thermal wear resistance was obtained, which was better than that of H13 and 3Cr2WSV. The large amount of coarse inclusions, （RE）2O2S, resulted from excessive RE, which obviously deteriorated thermal wear resistance. The mechanism of thermal wear of the modified cast die steel is oxidation wear and oxide fatigue delamination. The wear debris are lumps of Fe2O3 and Fe3O4.     

稀土对石墨层间化合物(GIC)结构及性能的影响

本文从稀土元素的结构特征出发，在结合我们前期理论研究工作的基础上，论述了稀土金属—、稀土金属—液氨—，稀土氯化物—石墨层间化合物的合成及它们的结构特点。通过研究稀土对ＧＩＣ结构及性能的影响，指出了稀土—石墨层间化合物的发展趋势及应用前景。     

Effect of Rare Earth Elements on Thermal Fatigue of High Ni－Cr Alloy Cast Iron

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＴｈｅｒｍａｌＦａｔｉｇｕｅｏｆＨｉｇｈＮｉ－ＣｒＡｌｌｏｙＣａｓｔＩｒｏｎＹａｎｇＱｉｎｇｘｉａｎｇ（杨庆祥）；ＷａｎｇＡｉｒｏｎｇ（王爱荣）；ＲｅｎＸｕｅｊｕｎ（任学军）；ＷｕＨａｏｑｕａｎ（...     

Modifying Effect of Rare Earths and Titanium on Austenitic Manganese Steel

ＭｏｄｉｆｙｉｎｇＥｆｅｃｔｏｆＲａｒｅＥａｒｔｈｓａｎｄＴｉｔａｎｉｕｍｏｎＡｕｓｔｅｎｉｔｉｃＭａｎｇａｎｅｓｅＳｔｅｌＺｈｕＲｕｉｆｕ（朱瑞富），ＬüＹｕｐｅｎｇ（吕宇鹏），ＬｉＳｈｉｔｏｎｇ（李士同）ＣｈａｏＺｈｉｑｉａｎｇ（朝志强），Ｗａ...     

Role of RE and Mg on Graphitization of Spheroidal Graphite Malleable Cast Iron

ＲｏｌｅｏｆＲＥａｎｄＭｇｏｎＧｒａｐｈｉｔｉｚａｔｉｏｎｏｆＳｐｈｅｒｏｉｄａｌＧｒａｐｈｉｔｅＭａｌｌｅａｂｌｅＣａｓｔＩｒｏｎ￥ＬｉｕＪｉｎ－Ｈａｉ（ＨｅｂｅｉＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｔｏｇｙ，Ｍｉａｎｊｉｎ３００１３０，Ｃｈｉｎａ）...     

Effects of Rare Earths on Toughness of 31Mn2SiRE Wear-Resistance Cast Steel

The toughness of 31Mn2SiRE wear-resistance cast steel were increased by means of RE compound modification and high temperature austenitizing. The results show that the microstructures can be refined, needle and network ferrite are eliminated, the dislocation density and the quantity of dislocated martensite are increased remarkably, and the shape and distribution of inclusions are improved by the addition of RE. Therefore, the mechanical properties of the modified steel can be greatly increased, especially the toughness (αK) by 44%, yield strength (σs) by 10%, and elongation (δ5) by 42%.     

稀土对Zn-Al-Cu合金机械性能的影响

研究了不同铝铜含量锌合金的强度,并加入适量的Ti,B,RE,Mg等元素,得出模具用锌合金的最佳铝铜含量（%,质量分数）分别为Al14%,Cu10%。重点研究了不同稀土含量（0,0.05%,0.1%,0.2%,0.4%,0.6%）对锌合金的影响,每种合金分别采用空冷和水冷两种冷却方式,结果表明,稀土含量为0.4%的合金为模具用锌合金的最佳稀土含量,其中以水冷方式为最佳的冷却方式。     

稀土变质铸铁石墨形态的转变

采用定向凝固实验方法考察了低凝固速度（下限为０．５ｍｍ／ｈ）下稀土变质铸铁石墨形态的转变。结果表明,随着稀土含量的增加,石墨形态呈现由Ａ型片状→Ａ′型片状→珊瑚状→蠕虫状→球状→开花状的一系列转变;石墨形态由片状到非片状的转变是由于生长方式改变所致,而这种改变取决于稀土含量,与凝固速度（或冷却速度）无关;石墨单体可以发生片状与非片状之间的连续转变,但在试样宏观的片状石墨区域与非片状石墨区域之间却存在着明显的分界线,说明石墨生长方式在试样宏观区域间发生了突变。     

脉冲电流对过共晶灰口铸铁凝固组织的影响

采用储能电容为1200uF的脉冲电源，在不同的充电电压下，对过共晶灰口铸铁进行电脉冲处理。结果表明：脉冲电流能够明显细化和改善过共晶灰口铸铁的凝固组织，使石墨由粗大的长片状变为小块状或小片状，石墨的分布更加均匀，而且尖角钝化甚至呈近似球形。脉冲电压的升高和脉冲频率的增大都有利于过共晶灰口铸铁凝固组织的细化和改善。     

耐碱蚀稀土合金铸铁研究与发展概述

普通铸铁、0C r18N i9等材料在高温浓碱液中的腐蚀严重。基于碱腐蚀问题,概述了国内外各种耐碱蚀合金铸铁的腐蚀特性、发展及应用,并从稀土、镍、铬、铜合金元素及组织对腐蚀性能的影响方面,分析了稀土合金铸铁的研究状况和发展。     

Physiological Effects of Rare Earths on Black Currant Plants

ＰｈｙｓｉｏｌｏｇｉｃａｌＥｆｆｅｃｔｓｏｆＲａｒｅＥａｒｔｈｓｏｎＢｌａｃｋＣｕｒｒａｎｔＰｌａｎｔｓ￥ＬｉｕＨｏｎｇｚｈａｎｇ（刘洪章），ＬｉＹａｄｏｎｇ（李亚东），ＨａｏＲｕｉ（郝瑞）（ＤｅｐａｒｔｍｅｎｔｏｆＨｏｒｔｉｃｕｌｔｕｒｅ，Ｊｉｌｉ...     

Effect of Rare Earths on Precipitation Kinetics of Niobium Carbide in Microalloyed Steel

ＥｆｅｃｔｏｆＲａｒｅＥａｒｔｈｓｏｎＰｒｅｃｉｐｉｔａｔｉｏｎＫｉｎｅｔｉｃｓｏｆＮｉｏｂｉｕｍＣａｒｂｉｄｅｉｎＭｉｃｒｏａｌｏｙｅｄＳｔｅｌＹｅＷｅｎ（叶文），ＬｉｕＹｏｎｇｈｕａ（刘勇华），ＬｉｎＱｉｎ（林勤），ＣｈｅｎＮｉｎｇ（陈宁）（Ｄｅ...     

Hydrogen Fixation Effect of Rare Earths in Pure Aluminium and Aluminium Alloys

The areal distribution of some elements in the rare earth bearing spheroidal phases in pure aluminium andAl-Mn alloys was studied by SIMS(secondary ion mass spectrometry).The results show that cerium,iron.silicon and hydrogen are significantly segregated in the phases.Thus the existence of hydrogen-rich rare earthbearing eompounds is confirmed.It indicates that the rare earths have a hydrogen fixation effect in aluminiumand aluminium alloys.