材料期刊网，材料期刊，材料类期刊，材料期刊投稿

COMPOSITION DESIGN FOR A BEARING STEEL WITH LIMITED HARDENABILITY

L. P. Xu , M. H. Xu , L. Li , Y.A. Min , X.Z Xuand R.H .Liu (Department of Materials Science and Engineering , Shanghai University , Shanghai 200072 , China) (Shanghai No.5 Iron and Steel Factory , Shanghai 200940 , China)

金属学报(英文版)

The composition of a bearing steel was designed for limited hardenability by use of Grossmann's method. A medium frequency induction Process was applied to heat bearings to ensure penetrant heating and suitable solving of carbon and other elements in the matrix. The hardened depth measured from the end quenching test samples and actual bearings matches well with the designed one.

关键词: : bearing steel , null , null

Initial Atmospheric Corrosion of Zinc in the Presence of NH4Cl

Q. Qu , C.W. Yan , L. Li , L. Zhang , G.H. Liu , C.N. Cao

金属学报(英文版)

Influence of NH4Cl on the initial atmospheric corrosion of zinc was investigated via quartz crystal microbalance (QCM) in laboratory at 80%RH and 25℃. The results show that NH4Cl can accelerate the initial corrosion of zinc. Mass gain increase with the exposure time, but mass gain in the later doesn't change obviously due to the formation of the insoluble simonkolleite on zinc surface in the presence of NH4Cl. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) was used to characterize the corrosion products. Zn5Cl2(OH)8·H2O, (NH4)2ZnCl4 and ZnO are the corrosion products on zinc. Brief discussion on the mechanisms of atmospheric corrosion of zinc in the presence of NH4Cl was introduced.

关键词: atmospheric corrosion , null , null

ON THE TENSILE MECHANICAL PROPERTY OF Si-Mn TRIP STEELS AT HIGH STRAIN RATE

X.C. Wei , L. Li , R.Y. Fu

金属学报(英文版)

Tensile mechanical properties of 1.6Si-1.58Mn-0.195C TRIP (transformation-inducedplasticity) steels under high strain rate and effects of DP (dual-phase) treatments werestudied and compared to the quasi-static tensile behavior. The results show that theincreasing of strain rate leads to increasing in their strengths and decreasing in theuniform elongation remarkably. Because the stable retained austenite in TRIP steelcan transform to martensite during tensile testing and the material exhibits excellentcharacteristic of transformation induced plasticity, the plastic deformation behavior isevidently improved and the combination of strength and elongation is superior to thatof dual-phase steel, although its strength is smaller than that of DP steel. However,DP treated steel shown lower elongation under dynamic tension in spite of higherstrength. A model was proposed to explain the excellent elongation rate of TRIPsteel compared with DP steel on the basis of SEM analysis and the strength of thecomponents in microstructure.

关键词: automobile sheet steel , null , null , null

Fe2+对嗜铁钩端螺旋菌L. ferriphilum生长活性的影响

高健 , 康健 , 吴学玲 , 徐競 , 李邦梅 , 邱冠周

中国有色金属学报

以分离于江西某铜矿的嗜铁钩端螺旋菌(L. ferriphilum YSK)菌株为研究对象,报道不同Fe2+浓度对 L. ferriphilum生长活性的影响.结果表明,YSK菌株生长最适宜的Fe2+浓度约为0.1 mol/L.当初始Fe2+浓度为0.4 mol/L时,进入对数生长期前很明显需要一个较长的延迟期,表明该Fe2+浓度对细胞的生长产生较强的抑制作用;当初始Fe2+浓度为0.6 mol/L时,YSK菌株的生长完全受到抑制.尽管高浓度的Fe2+抑制细胞的生长,但受到抑制而不生长繁殖的YSK细胞仍然具有氧化Fe2+的能力.

关键词: L.ferriphilum YSK菌株 , Fe2+ , 生长活性

Effect of Li and Ti Additions on L■α(Al)+Mg_2Si Pseudobinary Eutectic Reaction

Shengxu ZHAO , Shunpu LI , Deqian ZHAO , Mingxiang PAN and Xichen CHEN(Institute of Physics , Chinese Academy of Sciences , Beijing 100080 , China)

材料科学技术（英文）

Effect of Li and Ti additions on Lα(AI)+Mg2Si pseudobinary eutectic reaction in ternary Al-Mg-Si system has been investigated by thermoanalysis, directional solidification and metallographic techniques in this study. It has been found that Li addition causes decreasing of the volume fraction of Mg2Si, while a little amount of Ti causes to increasing, which is of a great importance to the adjustment of phase constitution and alloy properties. Doping components have little influence on the eutectic temperature.

关键词: