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REACTION MODEL IN Al-Ti-C SYSTEM

WANG Zidong , HU Hanqi(University of Science and Technology Beijing.Beijing , China)Li Qingchun(Harbin institute of Technology , Harbin.ChinaManuscript received 14 April 1995)

金属学报(英文版)

In this Paper,interaction coefficients among Al,Ti and C in Al-Ti-C ternary system and actual free energy of Al_3Ti,TiC and Al_4C_3,were calcutated via ternary alloy thermodynamic theory.The rsults show that,at low temperatures,Al_3Ti forms through the reaction of aluminium with titanium,and at high temperatures,the TiC forms hy the reaction of carbon with Al_3Ti.The reaction mechanism was verified by the experimental results.

关键词: :thermodynamics , null , null

钢管内涂标准SY/T 4078-1995应尽快修订

何浩 , 王献昉 , 金华

腐蚀与防护 doi:10.3969/j.issn.1005-748X.2004.09.012

石油天然气行业标准SY/T 4078-1995<钢质管道内涂层液体涂料补口机补口工艺>在适用范围、焊口表面处理、现场施工过程及焊口补口涂层检验等部分都有不妥之处.成功的工程实例表明:无溶剂环氧树脂作为管线内壁涂层的补口涂料是非常合适的,它可以使传统的补口工艺更加科学、合理.为保证钢管内壁涂层的整体质量应尽快予以修订该行业标准.

关键词: 石油天然气 , 行业标准 , 管线 , 无溶剂环氧树脂 , 涂层

EFFECT OF HYDROGENATION ON THE MICROSTRRUCTURE OFTi-24Al-14Nb-3V-0.5Mo ALLOY

L. Dong , L.G. Zhou , H. Ding and C.B. Zhang(Laboratory of Atomic Imaging of Solids , Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China)(Departmeot of Material Science , Northeastern University , Shenyang 110006 , China)

金属学报(英文版)

The ebct of hydrogenation-dehydrogenation on the microstructure of forping Ti-24Al14Nb-3V-0.5MO alloy was investigated by TEM and X-ray ddection. The resultsshowed that the microstructure consists of O and B2 phases as received materials, and tmoprmation of B2 phase to O phase can be eNctively promoted 6y hydrogenation. The lamellate γ hydride was found in O phase with more hydmpen content, and this γ hydride could be decomposed by dehydmpenation treatment. The sole fine Ophase could be obtained 6y hydmpenation-dehydmpenation treatment, and two possible mechanisms for the microstructure improvetnent have been discussed on the basis of experimental results.

关键词: Ti_3Al-based alloy , null , null

SPALLING MECHANISM OF NITRIDED LAYER OF AUSTENITIC STEEL 4Cr14Ni14W2Mo

SUN Xudong LI Jian Northeast University of Technology , Shenyang , China Lecturer , Dept.of Materials Science and Engineering , Northeast University of Technology , Shenyang , China

金属学报(英文版)

The tendency of spalling of the nitrided layer of the hot rolled austenitic steel 4Cr14Ni14W2Mo exhibits close relation to the nitrided surface orientation relative to the rol- led steel rod.It is found that the dislocations in the imperfectly recrystalized steel align as parallel dislocation walls in macroscopic extent,and the thickness of the“white sublayer”in the nitrided layer is much larger at the surface which is parallel to the dislocation walls.On such surface the spalling of the nitrided layer happens often.

关键词: nitriding , null , null

4Cr14Ni14W2Mo 钢的内氮化动力学

孙旭东 , 李见

材料研究学报

本工作导出了紧靠氮化物层下方发生的内氮化过程的动力学方程,方程也可用于双层内氮化过程。按此方程所设计的方案在氨气介质中对4Cr14Ni14W_2Mo 钢进行氮化实验,得到与预期相一致的结果。较高的氮化温度和较高的氨气分解率可免除该钢种的氮化层剥落。

关键词: 内氮化 , nitridation , chemical heat treatment

THE ACCURATE MOLECULAR FORMULA OF "Ti_(11)Ni_(14)" PHASE

C.L. Chu , G.J. Shen , S.D. Wang , B. Li , S.G. Zhang and Z.D. Yin(BOX 433 , School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China)(Analysis and Testing Center , Southeast University , Nanjing 210018 , China)(Research Institute of Electric Light Source Materials , Ministry of Light Industry , Nanjing 210015 , China)

金属学报(英文版)

From the orientation relationship between "Ti11Ni14" phase and matrix phase (B2),the accurate molecular formula of "Ti11N14" phase has been derived in this paper. The results also show that the rhombohedral unit cell of the "Ti11Ni14" phase includes six Ti atoms, seven Ni atoms and one vacancy, belonging to space group R3.

关键词: TiNi , null , null