材料期刊网

BEHAVIOURS OF AUSTEN1TE UNDER IMPACT ABRASION

WANG Huaming Institute of Metal Research , Academia Sinica , Shenyang , ChinaZHANG Qing Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , ChinaSHAO Hesheng Beijing Graduate School , China University of Mining and Technology , Beijing , China Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The role of austenite in impact-abrasion process was studied on the basis of the impact-abrasion test results of a newly developed austenite-bainitic ferrite dual-phase abrasion-resistant steel with high strength,high toughness and high strain-hardening ability. It is found that the morphology,distribution and mechanical stability,rather than the volume fraction,of austenite govern the impact abrasion behaviour.Only the appropriate amount of fine and evenly dispersed austenite with adequate mechanical stability in high strength matrices,contribute effectively to the irnpact-abrasion resistance of the materials.While large quantity of coarse austenite with poor mechanical stability,especially when it acted as a continuous matrix of the material,is extremely detrimental to impact-abrasion resistance.

关键词: austenite , null , null , null

Development and Impact-abrasion Behaviour of New Austenite-Bainite Low AHoy Steel

QU Jingxi WANG Huaming ZHANG Qing SHAO Hesheng ** Beijing Postgraduate School , China University of Mining and Technology , Beijing , 100083 , China+ To whom correspondence should be addressed

材料科学技术（英文）

A new category of steel with excellent combi- nation of strength,toughness,strain-hardening ability and excellent resistance to high-stress,espec- ially to severe impact-loaded abrasion has been de- veloped with a new idea of abrasion-resistant ma- terial design.The steels have the microstructures of austenite film and bainitic ferrite laths in arrange- ment of extremely fine lath spacing and are chemically high-carbon low alloy ones.The effects of austempering temperatures on microstructures, mechanical properties,wear-resistance and behaviour of the austenite-bainite steels in impact-abrasion system have been emphatically studied.

关键词: austenite-bainite microstructure , null , null

Recent Advances of Laser Coating Technology in China

LIANG Yong LI Ruiguo Institute of Metal Research , Academia Sinica , Shenyang 110015 , ChinaInstitute of Corrosion and Protection of Metals , Aademia Sinica , Shenyang , 110015 , China

材料科学技术（英文）

Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.

关键词: laser , null , null , 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:

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

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

Bibliography of Science and Technology of Rare EarthsPublished in China (2001)

稀土学报(英文版)

关键词: