Characterization and Preparation of Ce-Zr-O Solid Solution

ＣｅｒｉｕｍｏｘｉｄｅｗｉｔｈＣａＦ2 ｓｔｒｕｃｔｕｒｅｉｓｃｕｒ ｒｅｎｔｌｙｂｅｉｎｇｕｓｅｄａｓａｐｒｏｍｏｔｅｒｉｎｏｘｉｄａｔｉｏｎ .ＴｈｅｃａｐａｂｉｌｉｔｉｅｓｏｆｔｈｅｒｅｄｏｘｃｏｕｐｌｅＣｅ4 Ｃｅ3 ａｒｅｓｔｒｏｎｇｌｙｅｎｈａｎｃｅｄｉｆｏｔｈｅｒｅｌｅｍｅｎｔｉｓｉｎｔｒｏ ｄｕｃｅｄｉｎｔｏＣｅＯ2 ｌａｔｔｉｃｅｂｙｆｏｒｍｉｎｇｓｏｌｉｄｓｏｌｕ ｔｉｏｎ .ＳｅｖｅｒａｌａｐｐｒｏａｃｈｅｓｈａｖｅｂｅｅｎｕｓｅｄｔｏｐｒｅｐａｒｅＣｅＯ2 ＺｒＯ2 ｍｉｘｅｄｏｘｉｄｅ…     

The Abstracts of Papers in the Journal of the Chinese Rare Earth Society（inChinese）

ＴｈｅＡｂｓｔｒａｃｔｓｏｆＰａｐｅｒｓｉｎｔｈｅＪｏｕｒｎａｌｏｆｔｈｅＣｈｉｎｅｓｅＲａｒｅＥａｒｔｈＳｏｃｉｅｔｙ（ｉｎＣｈｉｎｅｓｅ）ＳｙｎｔｈｅｓｉｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆｔｈｅＣｏｏｒｄｉｎａｔｉｏｎＣｏｍｐｏｕｎｄｓ...     

Chinese Academic Journal(CAJ-CD) International Version Start to be Published for Overseas

ＣｈｉｎｅｓｅＡｃａｄｅｍｉｃＪｏｕｒｎａｌ（ＣＡＪ－ＣＤ）ｉｓａｓｅｒｉｅｓｏｆｉｎｔｅｇｒａｔｅｄｆｕｌｌｔｅｘｔｄａｔａｂａｓｅｏｆｃｕｒｒｅｎｔｅｌｅｃｔｒｏｎｉｃａｃａｄｅｍｉｃｊｏｕｒｎａｌｓｉｎＣｈｉｎａ．ＴｈｅｓｕｂｊｅｃｔａｒｅａｓｏｆＣＡＪ－ＣＤｃｏｖｅｒｈｕｍａｎｉｔｉｅｓ，ｓｏｃｉａｌｓｃｉｅｎｃｅ，ｎａｔｕｒａｌｓｃｉｅｎｃｅ，ｅｎｇｉｎｅｅｒｉｎｇ，ａｇｒｉｃｕｌｔｕｒｅ，ｍｅｄｉｃｉｎｅ，ｔｅｃｈｎｏｌｏｇｙ，ａｎｄｓｏｏｎ．Ａｌｌｔｈｏｓｅｊｏｕｒｎａｌｓｒｅｆｌ…     

Preparation and Characterization of Heteropolytungstoarsenate Complexes Containing Lanthanide Elements

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＨｅｔｅｒｏｐｏｌｙｔｕｎｇｓｔｏａｒｓｅｎａｔｅＣｏｍｐｌｅｘｅｓＣｏｎｔａｉｎｉｎｇＬａｎｔｈａｎｉｄｅＥｌｅｍｅｎｔｓ￥ＷａｎｇＷｅｉｑｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｃ...     

Current Status of Material Research and Development in CISRI

ＣｕｒｒｅｎｔＳｔａｔｕｓｏｆＭａｔｅｒｉａｌＲｅｓｅａｒｃｈａｎｄＤｅｖｅｌｏｐｍｅｎｔｉｎＣＩＳＲＩＷＥＭＧＹｕＱｉｎｇＰｒｏｆｅｓｓｏｒａｎｄＰｈ．Ｄ．ＰｒｅｓｉｄｅｎｔｏｆＣＩＳＲＩＴｈｅｆｕｌｌｎａｍｅｏｆＣＩＳＲＩｉｓＣｅｎｔｒａｌｌｒｏ...     

Synthesis，Characterization，Crystal Structure and Quantum Chemistry Calculation of the Mixed Ligand Complexes ［Ln（CF_3COO）_3·（Phen）_2·（H_2O）_2］·CH_3COCH_3·H_2O

Ｓｙｎｔｈｅｓｉｓ，Ｃｈａｒａｃｔｅｒｉｚａｔｉｏｎ，ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅａｎｄＱｕａｎｔｕｍＣｈｅｍｉｓｔｒｙＣａｌｃｕｌａｔｉｏｎｏｆｔｈｅＭｉｘｅｄＬｉｇａｎｄＣｏｍｐｌｅｘｅｓ［Ｌｎ（ＣＦ_３ＣＯＯ）_３·（Ｐｈｅｎ）_２·（Ｈ_２Ｏ...     

The Abstracts of Papers in the Journal of the Chinese Rare Earth Society （in Chinese）

ＴｈｅＡｂｓｔｒａｃｔｓｏｆＰａｐｅｒｓｉｎｔｈｅＪｏｕｒｎａｌｏｆｔｈｅＣｈｉｎｅｓｅＲａｒｅＥａｒｔｈＳｏｃｉｅｔｙ（ｉｎＣｈｉｎｅｓｅ）Ｓｙｎｔｈｅｓｉｓ，ＣｂａｒａｃｔｅｒｉｚａｔｉｏｎａｎｄＣａｔａｌｙｔｉｃＰｅｒｆｏｒｍａｎｃｅｏｆＲａｒ...     

The Abstracts of Papers in the Journal of the Chinese Rare Earth Society（inChinese）

ＴｈｅＡｂｓｔｒａｃｔｓｏｆＰａｐｅｒｓｉｎｔｈｅＪｏｕｒｎａｌｏｆｔｈｅＣｈｉｎｅｓｅＲａｒｅＥａｒｔｈＳｏｃｉｅｔｙ（ｉｎＣｈｉｎｅｓｅ）ＣｒｖｓｔａｌＳｔｒｕｃｔｔｕｒｅａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＧｌｕｔａｍａｔｃＣｏｍＰｌｅｘ...     

Chemical Bonds and Dielectric Constants of REM（RE＝Rare Earth，M＝N，P，As，Sb）Crystals

ＣｈｅｍｉｃａｌＢｏｎｄｓａｎｄＤｉｅｌｅｃｔｒｉｃＣｏｎｓｔａｎｔｓｏｆＲＥＭ（ＲＥ＝ＲａｒｅＥａｒｔｈ，Ｍ＝Ｎ，Ｐ，Ａｓ，Ｓｂ）ＣｒｙｓｔａｌｓＺｈａｎｇＳｉｙｕａｎ（张思远）（ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＣｈｅｍｉｓｔ...     

Thermodynamics and Phase Equilibrium of Cu－Ce－O，Cu－Ce－S，Cu－Ce－O－S Liquid Solutions

ＴｈｅｒｍｏｄｙｎａｍｉｃｓａｎｄＰｈａｓｅＥｑｕｉｌｉｂｒｉｕｍｏｆＣｕ－Ｃｅ－Ｏ，Ｃｕ－Ｃｅ－Ｓ，Ｃｕ－Ｃｅ－Ｏ－ＳＬｉｑｕｉｄＳｏｌｕｔｉｏｎｓＤＵＴｉｎｇ；ＬＩＧｕｏＤｏｎｇＴｈｅｒｍｏｄｙｎａｍｉｃｓａｎｄＰｈａｓｅＥｑｕｉｌｉｂｒｉｕｍｏ...     

Evaluation of deterioration mechanisms and roll life of different roll materials

Evaluation of wear loss of rolls in operation is very difficult since the rolling conditions are hard to keep under control. To solve this problem a high temperature test rig was designed. A conventional roll material was compared to a hot work tool steel. The main wear mechanisms were different. The conventional roll grade was mainly subjected to thermal fatigue as could be expected. The hot work tool steel was mainly subjected to abrasive wear, and no evidence of thermal fatigue was found. The rate of material loss was 6 times higher in the hot work tool steel, but when the deterioration caused by thermal fatigue of the cast iron is taken into consideration, the deterioration rate was of the same order in both materials. The friction between the hot steel and the roll materials were of the same order. The frictional value should be a measure of the wear rate. Since the wear mechanisms are not equal, the coefficient of friction found in the test rig is only qualitatively related to roll wear.     

SLM成形Al-Cu-Mg 合金的摩擦磨损性能

铝合金具有低密度、高比强度、较好的耐蚀性等优点，被广泛应用于航空、船舶和汽车等领域；选区激 光熔化成形可以一次性成形复杂零件，具有良好的应用前景。对选区激光熔化（SLM）成形的Al-Cu-Mg 合金 摩擦磨损性能进行了研究，并与成分相近的铸造ZL205A合金性能进行对比，结果表明，采用SLM工艺成形可 细化合金晶粒，改变Al2Cu 的尺寸与分布，使晶粒细小均匀。与铸造ZL205A合金相比，SLM成形Al-Cu-Mg 合金的磨损率和摩擦因数均有不同幅度的降低。SLM成形Al-Cu-Mg 合金横截面的耐磨性最好，纵截面耐磨 性次之，铸造ZL205A的耐磨性最差。SLM成形Al-Cu-Mg 合金的磨损机制随着载荷的变化而不同：低载荷时 的磨损机制以磨粒磨损为主，粘着磨损和塑性挤出磨损并存；中载荷时的磨损机制为磨粒磨损、粘着磨损并伴 随氧化磨损；高载荷时的磨损机制主要为剥层磨损、粘着磨损和氧化磨损的综合作用。     

Performances and failure mechanism of semi-metallic friction materials doping rare earths

In order to improve performance of semi-metallic friction material,the specimens doped with rare earth(cerous nitrate) were prepared.The effects of rare earth(cerous nitrate) and post heat treatment on properties of friction materials were discussed,and failure mechanism of friction materials was also analyzed.The result showed that the existing of cerous nitrate could stabilize friction coefficient,lower wear rate and increase impact strength,and when the content of the cerous nitrate was 3.0 wt.%,the semi-metallic friction material possessed optimal performances.The different post heat treatments had an influence on the friction coefficient,wear rate and linear thermal expansion coefficient of semi-metallic friction material.The worn surface and fractured surface were observed and analyzed by scanning electronic microscopy(SEM).It was identified that the semi-metallic friction materials doped with cerous nitrate acted abrasive wear and adhesive wear at the low temperature,and abrasive wear,adhesive wear and fatigue wear of materials appeared at the high temperature.The fracture of materials might be the result of matrix cracking interacting with interface separation.     

Experimental Study on Surface Deterioration of Hot RollingMill Rolls under Near Service Conditions

ＥｘｐｅｒｉｍｅｎｔａｌＳｔｕｄｙｏｎＳｕｒｆａｃｅＤｅｔｅｒｉｏｒａｔｉｏｎｏｆＨｏｔＲｏｌｌｉｎｇＭｉｌｌＲｏｌｌｓｕｎｄｅｒＮｅａｒＳｅｒｖｉｃｅＣｏｎｄｉｔｉｏｎｓＣｕｉＰｅｉｙｏｎｇＡｂｓｔｒａｃｔ：Ｗｉｔｈｓｐｅｃｉａｌｌｙｄｅｓｉｇｎｅ...     

轧辊磨损分析及计算

对 Φ1 1 50万能板坯初轧机的轧辊磨损进行了研究。从工程实测和理论分析两方面进行了对比分析 ,所采用的定量计算方法具有一定的使用价值 ,对提高轧辊使用寿命 ,合理制定轧辊切削工艺制度和轧钢生产制度有较好的实用效果。     

热轧中锰马氏体耐磨钢的冲击磨损行为

 利用MLD-10型动载磨料磨损试验机,系统研究了热轧中锰马氏体耐磨钢在1、2.5和5 J冲击能量作用下的冲击磨料磨损行为,并与Hardox450钢进行了比较。借助光学显微镜(OM)、扫描电子显微镜(SEM)和布氏硬度计等设备分析了试验钢的组织、力学性能及磨损表层、亚表层,并探讨了其磨损机制。研究结果表明,试验钢的显微组织为板条马氏体,与Hardox450钢相比,其布氏硬度更高,-40 ℃下的冲击吸收能量更低,分别为503HB和15.3 J。相同工况条件下,试验钢的磨损失重明显小于Hardox450钢,且基于有效磨损时间修正后的磨损率均随着冲击能量的升高,呈现出先增大后减小的趋势。当冲击能量为2.5 J时,磨损率最大,磨损失重量最多。原因在于,冲击能量较低时,试验钢的磨损主要以犁沟为主,并伴随着少量的磨粒嵌入,磨损失重较少;当冲击能量为2.5 J时,磨损表面的切削加剧,且塑性变形造成大量磨粒嵌入基体,导致应力集中,并在反复冲击过程中产生疲劳裂纹,随后扩展至试验钢表面,形成疲劳剥落,磨损亚表层出现明显剥落坑,失重显著增加;当冲击能量为5 J时,磨损表面塑性变形增加,加工硬化显著,疲劳磨损占据主导,磨损表面硬度较高,犁沟和磨粒嵌入较少,磨损亚表层更为平整均匀,失重反而减少,磨损率下降。     

载流条件下Cu-Ag-Fe合金的摩擦磨损行为

研究了电流强度、滑动速度和载荷对Cu-Ag-Fe合金的磨损性能的影响.结果表明：由于Fe元素的时效析出强化作用,Cu-Ag-Fe合金的电磨损性能比Cu-Ag合金高出2倍多,大大提高了该合金的使用寿命.随电流强度、滑动速度和载荷的增加,合金的质量磨损率明显增加.在受电滑动条件下,磨损形式以粘着磨损,磨粒磨损和电侵蚀磨损为主,并且随着电流强度的增加,粘着磨损现象加剧.     

Design criteria for rolling contact fatigue resistance in back-up rolls

Abstract

This research centres on surface initiated damage on back-up rolls whereby rolling contact fatigue cracks can propagate into the rolls potentially reaching the internal stress fields and leading to catastrophic failure and has sought to establish design criteria for avoiding such failures. The project objectives have been achieved by examining field evidence, determining the loading and tribological conditions at the work roll/back-up roll interface and investigating both theoretically and experimentally the mechanisms involved in rolling contact fatigue in this case. The presented rolling contact, fatigue and fracture mechanics model includes criteria for crack branching either upwards (i.e.relative safety) or downwards (i.e.potentially catastrophic) and the link between these two cases is related, quantitatively, to the properties of the roll material. After linking mechanics to microstructure, the influence of work roll test disc surface roughness on both the surface wear of and the interaction between wear and rolling contact fatigue at the surface of back-up roll test discs has been quantified using the results obtained from experimental simulations carried out on a rolling–sliding testing machine. Finally practical quantitative recommendations are made for the mechanical and microstructural design of bainitic back-up roll materials, back-up roll redressing procedures and the surface roughness of both work rolls and back-up rolls presented to the mill.     

高氮不锈轴承钢的微动磨损性能

为了探究应力和滑动速度对高氮不锈轴承钢微动磨损性能的影响,采用SRV-Ⅳ微动磨损试验机进行了不同应力和不同滑动速度下的微动磨损试验,对摩擦因数和磨损率进行分析,并对磨斑形貌进行观察.结果表明:试验钢的摩擦因数随应力和滑动速度的增加而减小;磨损率随应力和滑动速度的增加而增加.随着pv值(表示轴承工况的严重程度)的增大,高氮不锈轴承钢的磨损机理由黏着磨损逐渐转变为磨粒磨损和塑性挤出磨损.     

Roll Wear Evaluation of HSS,HiCr and IC Work Rolls in Hot Strip Mill

While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction model have been published. The aim of this work is to evaluate and compare two prediction models with measured roll wear. The first prediction model, model 1, developed for a plate mill, was modified to use in strip rolling process. The second prediction model, model 2, is a simplified on‐line model. Data of two hot strip mills were used to investigate the influence of different rolling schedules. The rolls and strip properties were described and the rolling conditions were detailed. The influence of hot rolling factors, such as strip strength, roll grades, rolling temperature, rolling force, reduction and contact length, were also studied. When rolling with different work roll materials and strip grades, the modified prediction model has better prediction accuracy than the simplified model. The accuracy of both models becomes better at higher roll wear > 150 μm. HSS work rolls were confirmed to exhibit improvement of roll wear in comparison with HiCr rolls, the wear resistance was 3 to 4 times better. The influence of strip grade on roll wear was shown to be significant, with higher accuracy of the regression statistics for rolling with similar strip grades and lower regressed accuracy for rolling with mixed strip grades. The roll wear was evaluated at the centre of the barrel.