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CRYSTAL DEFECTS AND GRAIN INTERFACE STRUCTURE OF ION-NITRIDED LAYERS

SUN Dongsheng LI Fengzhao Shandong Polytechnic University , Jinan , Laboratory of Atomic Imaging of Solids , Institute of Metal Research , Academia Sinica , Shenyang , ChinaDAI Jiyan LI Douxing Laboratory of Atomic Imaging of Solids , Institute of Metal Research , Academia Sinica , Shenyang , China associate professor , Institute of Materials Engineering , Shandong Polytechnic University , Jinan 250014 , China

金属学报(英文版)

Observation under high resolution electron microscope shows that the continuous bombing of high speed ions produces a great amount of vacant site defects.The assembly of vacancies forms vacant dish,and the collapase of vacant dish forms stacking fault tetrahedrons and oth- er crystal defects.The interfaces between phase ε(Fe_(2-3)N)and phase γ'(Fe_4N)are smooth, straight and coherent,and they have the orientation relationships of(11)//(0001)and [110]/[110] .

关键词: crystal defect , null , null , null

MECHANICAL PROPERTIES OF Al-Li ALLOY 8090 AT CRYOGENIC TEMPERATURES

SUN Dongsheng LI Fengzhao ZHANG Gang Shandong Polytechnic University , Jinan , China Lecturer , Centre of Materials Testing and Analysis , Shandong Polytechnic University , Jinan 250014 , China

金属学报(英文版)

Cryogenic strength,ductility and toughness of AI-Li alloy 8090 were found to be superior to those at ambient temperature,and up to optima at about 20 K.Different aging regimes may only influence on its cryogenic yield strength and elongation.

关键词: Al-Li alloy , null , null , null

DSC STUDY OF MARTENSITIC TRANSFORMATION KINETICS IN A Cu-Zn-Al-Mn-Ni SHAPE MEMORY ALLOY

GENG Guili , BAI Yujun , PENG Qifeng(Institute for Materials Engineering , Shandong University of Technology , Jinan 250014 , China) Manuscript received 30 May 1995

金属学报(英文版)

The kinetics of the reversible martensitic transformation in a Cu-Zn-Al-Mn-Ni shape memory alloy has been studied by means of differential scanning calorimetry.The apparent activation energy has been calculated and the kinetic equations of positive and adverse martensitic transformation have been established with the variations of temperature and time.

关键词: :shape memory alloy , null , null , null

Process of Re-Resourcing of Converter Slag

GAO Jin-tao , LI Shi-qi , ZHANG Yan-ting , ZHANG Yan-ling , CHEN Pei-yu , SHEN Ping

钢铁研究学报(英文版)

The process of “re-resourcing of converter slag” was put forward based on the analysis of the existing steel slag treatment process. The converter slag obtained from Jinan steel plant was studied. After grinding, the slag contained 33% of iron particles, 5484% of magnetic part (wTFe=20%), and 4184% of non-magnetic part, which could be used for making cement directly. At a temperature below 1000 ℃, the non-magnetic Fe2O3 in the slag could be efficiently reduced to magnetic iron by pure H2 and CO. The slag after precise reduction had high degree of dispersion and did not get sintered, which provided an optimum condition for the separation of iron and impurities. To separate the slag and enrich the iron after reduction, the laboratory-scale device of magnetic separation was designed and made. The process of slag re-resourcing, which included magnetic sorting, precise reduction, magnetic separation, and removal of free calcium oxide (f-CaO), was proposed to obtain iron-rich magnetic materials and cement adulterant materials. Through this process, 33 kg iron particles, 150 kg iron-rich material and 700 kg cement could be obtained in each ton slag. Besides, this process to recycle converter slag had a lower energy and material consumption and no pollutant emission.

关键词: converter slag , resource recycling , precise reduction , cement

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