材料期刊网

KINETICS OF PHASE TRANSFORMATION FOR DEFORMED AUSTENITE TO PROEUTECTOID FERRITE

LI Jian SUN Fuyu Central Iron and Steel Research Institute , Beijing , China Engineer , Department No.4 , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing 100081 , China

金属学报(英文版)

The volume fraction of proeutectoid ferrite transformed from deformed austenite fv as a func- tion of isothermal time t has been investigated in 0.037% Nb microalloyed steel.The results show that lnln(1-fv)~(-1) vs Int relation does not follow the Avrami equation strictly and con- sists of two straight lines.By comparing the differences between the results and Cahn's theory, the authors' idea has been expounded.

关键词: austenite deformation , null , null

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

Brief Outline of the Metallurgy Department of Kunming Institute of Technology

LIU Chunpeng Kunming Institute of Technology , Kunming 650093 , China.

材料科学技术（英文）

关键词:

Department of Metallurgy and Materials Engineering of Chongqing University

YAN Guangting Chongqing University , Sichuan , China.

材料科学技术（英文）

关键词:

U.S.Department of Energy Research in Intermetallic Alloys and Composites

Alan L. Dragoo (Division of Materials Sciences Office of Basic Energy Sciences U.S.Department of Energy Washington , D.C.20585) U.S.A.

金属学报(英文版)

关键词:

STATISTICAL EVALUATION OF CRITICAL INCLUSION FACTOR FOR SECONDARY RECRYSTALLIZATON IN 3%Si STEEL Lecturer,Department of Materials Engineering,Southwestern Jiaotong University,Chengdu 610031,China

LI Shuchen Southwestern Jiaotong University , Chengdu , ChinaCHEN Mengzhe KE Jun University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

On the basis of statistical data of MnS in the conventional 3% Si steel sheeets after various annealing processes,the critical inclusion factor has been evaluated to be 20 mm~(-1).The inhi- bition of MnS to grain growth has been exactly described.

关键词: 3%Si steel , null , null

NH4GdF4的合成机理研究

姜银举 , 张小琴 , 郭海涛 , 王佐成

稀土 doi:10.3969/j.issn.1004-0277.2008.06.021

利用差热-热重分析方法,研究了Gd2O3和NH4HF2反应中间产物NH4GdF4的合成机理.结果表明,NH4GdF4是在NH4HF2熔化后与Gd2O3通过固-液相反应直接合成的;Gd2O3和NH4HF2反应的另一种中间产物为NH4F,NH4F在稍高的温度下热分解为NH3和HF;NH4F与GdF3不能合成NH4GdF4 ;GdOF也可以与NH4HF2反应合成NH4GdF4,但GdOF不是Gd2O3和NH4HF2反应的中间产物.分析了Gd2O3和NH4HF2反应不能完全合成NH4GdF4的原因.

关键词: NH4GdF4 , 合成 , 机理

TiO2对制备Al4SiC4-Al4O4C复合材料的作用

邓承继 , 匡健磊 , 祝洪喜 , 白晨

耐火材料 doi:10.3969/j.issn.1001-1935.2009.04.002

的TiO2在1 300 ℃前全部反应转变为TiC,生成的TiC在1 300～1 700 ℃稳定存在;Tio2加入量对材料物相组成没有明显影响,但TiO2加入量超过3%时,Al4SiC4和Al4O4C的生成温度将由1 500℃提升至1 600℃;随着材料中Ti4+浓度增加,Ti4+更容易与Al4SiC4形成有限置换固溶体而导致晶格缺陷,促使Al4SiC4在1 700℃分解,形成更多的Al4O4C短纤维,同时使试样表面生成片状Al2O3层.

关键词: Al4SiC4-Al4O4C复合耐火材料 , TiO2 , 固溶 , 显微结构

10Cr4Ni4Mo4V钢和Cr4Mo4V钢的特性与断裂行为

叶健熠 , 王杰君 , 谷臣清

材料开发与应用 doi:10.3969/j.issn.1003-1545.1999.03.004

对10Cr4Ni4Mo4V钢和Cr4Mo4V钢的特性与断裂行为进行了试验研究.结果表明,10Cr4Ni4Mo4V钢经微氮渗碳热处理后,其表面硬度、残余应力、断裂韧性及裂纹扩展速率均优于Cr4Mo4V钢的.

关键词: 钢 , 特性 , 断裂韧性 , 裂纹扩展速率

Al4SiC4的性能、制备和应用

邓承继 , 辜孔良 , 祝洪喜 , 谢大勇 , 李涛

耐火材料 doi:10.3969/j.issn.1001-1935.2008.05.017

介绍了一种待研发的新型三元碳化物Al4SiC4(碳硅化铝)的组成和基本性能,并重点讨论了Al4SiC4的各种合成和制备方法,如固相反应烧结法、高温自蔓延法等的原理及效果.首先讨论了Al4SiC4材料的基本性能、抗氧化性能和抗水化性能,比较了Al4SiC4和其他材料之间的性能差异,并介绍了Al4SiC4的应用范围;最后对Al4SiC4材料的合成方法和性能进行了总结,同时指出了碳硅化铝材料作为新型耐火材料的研究和使用的进一步研究方向.

关键词: Al4SiC4 , 制备 , 性能 , 应用