杜维玺
,
韩其勇
,
蒋青
,
张钟植
,
钟伟珍
,
刘绍收
金属学报
本文采用电解分离-放射性测量法及显微自射线照相法研究了Ce及S在高纯Fe-C-Si合金各相中的分布和其对石墨形态的影响。实验结果表明:Ce除了与S,O形成夹杂外,首先在石墨中富集;随着合金中Ce含量的增加,石墨中Ce量趋于饱和,大量的Ce以合金化形式存在于铸铁之中;S也在石墨中富集,如合金中S含量继续增加,则以FeS形式存在于共晶团边界;合金中固溶S量极微;石墨形态与Ce在石墨中的吸附和镶嵌程度有关,呈饱和镶嵌吸附时,石墨程球状;呈半饱和态时,石墨为蠕虫状。
关键词:
Ce
,
S
,
Fe-C-Si alloy
,
graphite
韩其勇
,
杨平
,
宋维锡
金属学报
采用液淬法配合自射线照相研究了反球化元素硫在铸铁凝固过程各高温相中的分布。结果表明:灰铸铁中,硫在液相及片墨中的浓度较高,在奥氏体中最低,在D型石墨共晶团的周边有富集。在球铁中,球墨中硫的浓度相对较高,液相及奥氏体中则较低。粗片墨(A型)中硫的浓度比细片墨(D型)中的高,共晶奥氏体中硫的浓度高于先共晶枝晶奥氏体。 自射线照相中乳胶的感光代表放射性物质的原子百分浓度。
关键词:
石墨
,
autoradiograph
,
sulfur
,
graphite
朱瑞辉
,
王禹
,
韩其勇
,
宋维锡
金属学报
用定向凝固和电解萃取—放射性同位素测量技术,分析了球化剂Ce在球铁各相中的分布;配合测量石墨球化率,确定了球铁含Ce量与石墨球化程度的关系,结果表明:Ce在球铁中主要以合金化Ce的形式存在,但石墨相Ce含量是石墨球化程度的表征值;只有当石墨相Ce含量高于一定值时,石墨才能完全球化。
关键词:
稀土球墨铸铁
,
directional solidification
,
graphite
,
Ce
LIU Yongkun Southwestern Institute of Technology and Engineering
,
Chongqing
,
ChinaYANG Shihao Shandong Polytechnical University
,
Jinan
,
China
金属学报(英文版)
Using liquid quenching technique,the change of growth mode of graphite in cast iron melt was analysed.Based on the interface structure theory of crystal growth,the concept of multiplication of spiral growth steps was advanced and two basic multiplication models were given.It was proposed that multiplication of spiral steps is responsible for the change of growth mode of graphite in cast iron melt.The modifying elements such as Ce promote multiplication of spiral steps,which is regarded as the core of modification.Origination of screw dislocation and branch of the sector blocks in radius direction,both of which are essential to spheroidization of graphite in the melt,are caused by multiplication of spiral steps:and so is thickening of graphite plates.
关键词:
graphite
,
null
,
null
,
null
,
null
ZHU Ruihui WANG Yu HAN Qiyong SONG Weixi University of Science and Technology Beijing
,
Beijing
,
China Engineer
,
Institute of Precise and Special New Materials
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
The dependence of nodularization of graphite upon Ce content in RE bearing nodular cast iron,prepared by directional solidification,has been investigated by electrolytic extraction-radioisotope assay analysis of Ce in each phase of the iron together with measurement of nodulized graphite.Results show that the Ce occurs mainly as alloyed form. In the graphite phase,the Ce content is believed to be characterization of nodularization.The graphite would completely nodulized only the Ce is over a certain content in graphite phase.
关键词:
RE nodular cast iron
,
null
,
null
,
null
HAN Qiyong YANG Ping SONG Weixi University of Science and Technolonology Beijing
,
Beijing
,
China Division of Metallography
,
Dept.of Materials
,
University of Science and Technology Beijing
,
Beijing
,
China
金属学报(英文版)
The distribution of subversive element sulfur in high temperature phases during solidification of cast iron was investigated by means of liquid quenching method and autoradiography.The results show that in grey cast iron,sulfur is concentrated in the liquid,flake graphite and in the peripherial area of D-type supercooled graphite eutectic cells,but less sulfur is in austenite. Besides,the content of sulfur in A-type graphite is higher than that in D-type graphite,and sulfur content in eutectic austenite is a little higher than that in primary austenite.While,in nodular graphite cast iron less sulfur is in liquid and austenite,but more in nodular graphite. The blackness of the spots on the emulsion film corresponds to the atomic percentage of radioactive substances located on the surface of the specimen.
关键词:
cast iron
,
null
,
null
,
null
DU Weixi HAN Qiyong JIANG Qing ZHANG Zhongzhi ZHONG Weizhen LIU Shaoshou Jilin University of Technology
,
Changchun
,
China [Originally published in ACTA METALL SIN (CHINESE EDN) 24(5) 1988pp B313—B319
,
received 17 Octorber 1986
,
in revised form 3 April 19871 Beijing University of Science and Technology
金属学报(英文版)
Electrolytic extraction-radiometry and microradioautography techniques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy.The results show that,besides forming inclusions,most of Ce atoms concentrate in graphite firstly.As the Ce content increases,the concentration of Ce in graphite tends to saturate,relatively large amount of Ce dissolves in the alloy.Usually,the sulphur also concentrates in graphite.However,it may exist in the form of FeS at the eutectic colony boundaries,if the concentration of S is at a quite high level.Very little amount of S dissolves in the alloy.The morphology of graphite depends upon the degree of saturation of Ce.It appears as nodular when Ce was saturated and,as vermicular while it was semi-saturated.
关键词:
Ce.S.Fe-C-Si alloy
,
null
田运霞
,
陈玲
,
梁正彦
,
麻慧
,
王佳庆
电镀与涂饰
研究了石墨、磷铁粉、滑石粉和高钛灰取代醇溶性无机富锌漆中的部分球状锌粉对涂层耐蚀性的影响.通过耐盐水、耐盐雾以及开路电位-时间测试,研究了涂层的耐蚀性.结果表明,各粉体取代涂层都有一个最优取代比,且在最优取代比时涂层的阴极保护时间最长.导电粉取代涂层比非导电粉取代涂层的防腐效果更好.导电粉取代涂层的初始开路电位随取代比的增大先负移后正移,在最优取代比时达到最负值；非导电粉取代涂层的初始开路电位随着取代比的增大而逐渐正移.
关键词:
无机富锌漆
,
球状锌粉
,
取代
,
石墨
,
磷铁粉
,
滑石
,
高钛灰
,
耐蚀性
