材料期刊网

Alloying Design for High WearResistant Cast HotForging Die Steels

CUI Xianghong , SHAN Jun , YANG Zirun , WEI Minxian , WANG Shuqi , DONG Chuang

钢铁研究学报(英文版)

The alloying design of cast hotforging die steels was analyzed. The relationship of the life of cast hotforging dies with the failure patterns was studied. The thermal wear resistance was believed to be the key property for the alloying design of cast hotforging die steels. The alloying design parameters were selected and optimized for the cast hotforging die steel with high wear resistance. The wear resistance of the optimized cast die steel was evaluated in comparison with commercial H13 steels and 3Cr2W8V steel. In the new cast hotforging die steel, VC is predominant carbide with Cr and Mo as the main solution elements in αFe. It is found that the cast die steel has significantly lower wear rate than normal H13 steel and 3Cr2W8V steel, almost the same as that of high purity H13 steel. The high wear resistance of the new cast hotforging die steel can be attributed to its reasonable alloying design and nonsensibility to the detrimental function of S and P.

关键词: hotforging die;cast steel;wear resistance;alloying design

原生QI成核中间相炭微球的结构

王成扬 , 姜卉 , 李鹏 , 郑嘉明

新型炭材料 doi:10.3969/j.issn.1007-8827.2000.04.003

以含有原生QI的煤沥青为原料,采用热缩聚方法制备出中间相炭微球.用扫描电子显微镜(SEM)观察了中间相炭微球的形貌和断面结构.经初步判断,在实验条件下原生QI成核煤沥青基中间相炭微球更倾向于"地球仪" 型结构.并对以QI为核形成中间相微球的过程进行了分析.

关键词: 原生喹啉不溶物 , 中间相炭微球 , 结构

煤沥青原料中QI含量对中间相有序生长的影响

黄爱华 , 金鸣林 , 李和兴 , 房永征

材料导报

试验是以2种含不同QI的煤沥青为原料,采用变径反应管进行热转化反应制备有序性中间相的研究.试验采用偏光显微镜和扫描电镜(SEM)观察了原料各反应阶段的微观结构,考察了QI对热转化过程中中间相有序生长的影响,分析了热转化过程中软化点及族组分的变化.结果表明:少量的喹啉不溶物含量不会阻碍中间相有序的发展.高QI(2.03%)原料易生成镶嵌结构的中间相体,高温处理后样品呈轴状、短纤维、层片松散的石墨化焦结构;含低QI(0.11%)的原料能生成较好的、大区域的中间相体,域结构的中间相体在外力导向和内部裂解气流的作用下容易生成有序的半焦,高温处理后呈大区域、片层紧密、有序性强的细纤维焦结构.同时研究发现,在热转化过程中可通过测定软化点(SP)和TI含量来确定中间相转化程度.软化点约低于250℃、TI为75%左右时为初始中间相区域体形成阶段、半焦生成的前期.

关键词: 煤沥青 , 热转化反应 , 喹啉不溶物 , 中间相

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

天然气井油管悬挂器腐蚀失效分析

刘守平 , 周上祺 , 王佳眉 , 任勤

腐蚀科学与防护技术

用金相显微镜、扫描电镜、X射线衍射仪和X射线能谱仪对天然气井油管悬挂器腐蚀失效进行了检测分析，并对天然气井油管悬挂器用35CrMo钢进行了盐雾试验，结果表明，天然气中的水和CO2是引起腐蚀的主要介质，腐蚀产物主要是FeCO3，高速天然气冲刷和钢中的非金属夹杂加剧了腐蚀的速度. CORROSION FAILURE ANALYSIS OF AN OIL TUBE USED IN NATURAL GAS WELL LIU Shou-ping,ZHOU Shang-qi,WANG Jia-mei,REN Qin Chongqing University A failed oil tube used in natural gas well was examined by optical microscope,scanning electron microscope ,X-ray diffractometer and X-ray spectrometer.Corrosion behavior of 35CrMo steel samples of the oil tube were investigated by means of salt spray tests in the laboratory.The results show that CO2 and H2O are primary factors in the corrosion of oil tube.The corrosion product is FeCO3,non-metallic inclusions in the steel and erosion of natural gas fluid played an important role in accelerating the corrosion. oil tube; natural gas well； 35CrMo steel； failure analysis； corrosion

关键词: 悬挂器 , null , null , null

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

高软化点各向同性沥青和各向异性沥青中喹啉不溶物的结构研究

刘小红 , 王成扬 , 陈明鸣 , 于宝军

材料导报

以软化点相近的高软化点各向同性沥青和各向异性沥青为原料,经溶剂萃取分离出喹啉不溶物(QI),采用偏光显微镜、扫描电镜、元素组成分析、碘吸附测试和X射线衍射分析,对各向异性沥青的光学织构、QI的形貌及其微观结构进行了分析.结果表明,不同原料来源的各向异性沥青会表现出不同的光学各向异性.对高软化点沥青QI的分析表明,虽然母体沥青的软化点相近,但是具有不同光学各向性的沥青分离出的QI在形貌和微观结构上有较大的差异,各向异性沥青QI的分子交联度、芳香度和缩合度均比各向同性沥青QI小,但是平面分子结构更规整,有序度更高.同时发现,当沥青为各向同性时,母体沥青的分子有序度不如QI高,但当沥青为各向异性时,母体沥青的有序度却高于QI.

关键词: 各向同性 , 各向异性 , 高软化点 , 喹啉不溶物

Fe-Mn-C系M_s及马氏体相变驱动力的热力学计算

张鸿冰 , 倪乐民 , 徐祖耀

金属学报

经 LFG(ΔG~(γ→a))-Mogutnov(ΔG_(Fe)~(γ→a))、徐祖耀(Shu-A)(ΔG~(γ→a))-Orr-Chipman(ΔG_(Fe)~(γ→a))、徐祖耀(Shu-B)(ΔG~(γ→a))-Orr-Chipman(ΔG_(Fe)~(γ→a))组合,均可算得 Fe-Mn-C 合金的 Ms 温度且与实验值十分符合.所得结果经数学处理,得 Fe-Mn-C 系 Ms 与成分的关系为:Ms(K)=817.4-7513.4xc-4141.9x_(Mn)-32083.5x_Cx_(Mn)(LFG)Ms(K)=829.9-7580.5x_C-4166.0x_(Mn)-15727.8x_Cx_(Mn)(SHU-A)Ms(K)=829.2-7276.1x_C-2915.4x_(Mn)-43825.7x_Cx_(Mn)(SHU-B)其线性相关系数均大于0.992.C 和 Mn 浓度均使合金的 Ms 线性地降低,而碳的作用几乎是Mn 的两倍.处理中引入了合金元素交互作用项(x_Cx_(Mn)),表明 C,Mn 相互加剧对 Ms 的影响。随含 C,Mn 量的增加,相变驱动力均单调地增加,而不存在奇异点.Ms 和相变驱动力的计算值均依赖于ΔG_(Fe)~(γ→a)项.

关键词:

炭/炭复合材料用高性能浸渍剂沥青的研究

许斌 , 李铁虎

复合材料学报 doi:10.3321/j.issn:1000-3851.2003.02.013

根据原生QI杂质由微米级炭粒构成的特性,采用溶剂絮凝法对煤焦油进行了净化处理,以净化煤焦油为原料制备了低QI含量的高性能浸渍剂沥青,对比研究了高性能浸渍剂沥青的流变性能和渗透性能.结果证实:高性能浸渍剂沥青极大地改善了浸渍效果,并且使炭/炭复合材料的力学性能显著提高.

关键词: 炭/炭复合材料 , 浸渍剂沥青 , 原生QI杂质 , 粘度 , 渗透性 , 性能

中温煤沥青喹啉不溶物的脱除及炭化制备针状焦

唐闲逸 , 魏晓慧 , 许德平 , 张海永 , 贺欣 , 熊楚安 , 唐瀚滢

材料研究学报 doi:10.11901/1005.3093.2015.685

以中温煤沥青为原料,研究其在弹管反应器中的炭化以及“反溶剂法”脱出喹啉不溶物(QI)后的精制沥青的炭化效果.结果表明:含有较高QI的非精制沥青不能制备出较好的针状焦,但在500℃,0.2 MPa,10h的炭化条件下,能够得到相对较优热膨胀系数(CTE)的炭化结果;以煤油和洗油为混合溶剂,反溶剂法能够有效地脱除喹啉不溶物,在芳脂比0.4,沉降温度100℃,搅拌时间0.5 h,沉降时间4h,溶剂比1.8、2的条件下,QI含量分别降到0.0914％和0.0695％,将其在500℃、0.2 MPa、10h的条件下炭化,可制备出热膨胀系数(CTE)较低的针状焦.

关键词: 材料合成与加工工艺 , 中温煤沥青 , 反溶剂法 , 喹啉不溶物 , 炭化 , 针状焦