材料期刊网

OXIDE METALLURGY-ITS PURPOSES AND PRACTICAL APPROACHES

Z. T. Ma and D. Janke(Institute of Iron and Steel Technology , Freiberg University of Mining and Technology , Germany)

金属学报(英文版)

Useder certain conditions, nonmctallic inclusions such as oxides, sulfides, nitrides and carbides are no longer harmful to sted service properties. With the new concept of oxide metallurgy, these properties can be improved by generating fine oxide inclusions which serve as heterogeneous nuclei for sulfide and fine ferrite[1-4]. A novel continuous casting (CC) process is expected to be created with the utilization of oxide metallurgy. This is also useful for the forthcoming technologies of direct rolling and near-net-shape casting. The main idea of oxide metallurgy consists of an alternative oxidation technology. It is based on steels treated by complex metals such as Ti, Zr, Ti-Zr alloys and rare earth metals. The selected deoxidants should follow the required conditions which are concluded in this paper.

关键词: oxide , null , null , null

THERMODYNAMIC TREATMENT OF MULTICOMPONENT SYSTEMS USING INTERACTION PARAMETERS

Z. T. Ma , J Ohser and D. Janke(Institute of Iron and Steel Technology , Freiberg University of Mining and Technology , Germany )

金属学报(英文版)

The partial thermodynamic functions of solvent and solutes in multicomponent systems have been expressed in terms of the interaction parameters. The corresponding analytical expressions of the activity coefficients of solvent and solutes enable to de scribe the thermodynamic properties of multicomponent systems. The advantages of this treatment are found in its thermodynamic consistency and a rather small influ ence of the higher order interaction parameters on the properties of the systetms.

关键词: thermodynamics; activity; model

AN ASSESSMENT OF INTERACTION PARAMETERS IN BINARY　METALLIC SYSTEMS

Z. T. Ma and D. Janke(Institute of Iron and Steel Technology , Freiberg University of Mining and Technology , Germany)

金属学报(英文版)

An approach of describing the thermodynamics of binary alloys is developed which is based on an exact expression of infinite MacLaurin series of molar excess Gibbs free energy. This new approach is successfully used to represent the thermodynamics of binary alloys at higher concentrations. The present results reveal that it is an improper way to evaluate first and second-order interaction parameters simultaneously from the experimental data in the range of higher concentrations due to an inadequate accuracy Of high temperature experiments.

关键词: thermodynamics , null , null , null

THERMODYNAMIC PROPERTIES OF NITROGEN IN Fe-Cr-Ni ALLOYS AT 1873K

Z.T.Ma and D. Janke (Institute of Iron and Steel Technology , Freiberg University of Mining and Technology , Germany)

金属学报(英文版)

Thermodynamic behavior of nitropen in Fe-Cr-Ni alloys at 1873K is discussed in the present study. The dependence of upon the content of Cr in Fe-Cr-Ni-N melt is expressed. The present authors' formalism[17] developed for describing thermodynamics of metallic multicomponent systems is successfully applied to the Fe-Cr-Ni-N quaternary system.

关键词: Fe-Cr-Ni alloy , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词:

Laser cladding coating against erosion-corrosion wear and its application to mining machine parts

Wear

Erosion-corrosion wear is a common failure type for many mining machine parts. This paper introduces the erosion-corrosion wear resistant, nickel based alloy coating, which is manufactured onto AISI 1045 steel by laser cladding technology. X-ray diffraction, scanning electron microscopy (SEM) and microhardness testing were used to investigate the microstructure and hardness of the coating. After that, erosion-corrosion wear experiments were carried out on an MSH type erosion-corrosion wear tester to study the erosion-corrosion wear characteristics of the laser clad coating. 420 stainless steel was also tested under the same conditions as a contrast specimen. The slurry was made up of water and quartz, while sulphuric acid was added to create corrosive condition. Experiments were arranged to test the relation between erosion-corrosion wear rate, the acid concentration and slurry erosion speed. Finally this gaper introduces the application of laser cladding technology to balance plates of slurry pumps used in underground mining. (C) 1997 Elsevier Science S.A.

关键词: laser cladding;coating;erosion-corrosion wear;synergism

Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

关键词:

Huazhong University of Science and Technology(H.U.S.T)

材料科学技术（英文）

关键词:

Study on blister of the coating on solid cantilevers of hydraulic supports for coal mining

Science China-Technological Sciences

In this work, blister of the Cu-Sn plus Cr coating on solid cantilevers of hydraulic supports for coal mining was investigated by hydrogen-charging, Devanathan-Stachurski method and electrochemical impedance spectroscopy (EIS) measurement. It was found that the permeation hydrogen during the pickling process and the electroplating process was responsible for the blisters. The residual tensile stress due to the machining process would increase the permeation hydrogen amount during pickling and electroplating processes.

关键词: hydrogen blister;hydrogen permeation;EIS;sub-surface hydrogen;concentration;ph-microscopy;hydrogen;permeation;steel;metals

欢迎投稿、订阅《Journal of Wuhan University of Technology-Materials Science Edition》

武汉理工大学学报-材料科学版(英文版)

关键词: