材料期刊网

INTERPHASE STRESS CORROSION CRACKING OF ALLOY Ti-24Al-11Nb IN METHANOL SOLUTION

ZHANG Yue , CHU Wuyang , XIAO Jimei(Department of Materials Physics , University of Science and Technology Beijing , Beijing 100083 , China) OUYANG Shixi , YUAN Runzhang(State Key Laboratory for Synthesis and Processing of Advanced Materials.Wuhan University of Technology , Wuhan 430070 , China)

金属学报(英文版)

For alloy Ti-24Al-11Nb,stress corrosion cracking(SCC) in methanol solution and hydrogen induced cracking(HIC) during dynamic charging at room temperature have been studied.Experiment has shown that the normalised threshold stress intensities of SCC failure for various microstructures are KISCC/KC =0.53 0.69 and the threshold value for SCC arresting KISCC/ KIC=0.61-0.79.The threshold values of HIC during dynamic charging are close to that of SCC,but da/dt or fracture time of HIC is one to three orders of magnitude smaller or longer than that of SCC,respectively.The.fracture surface for HIC is also different from that for SCC.For the Ti-24Al-Nb alloy-methanol systein,a kind of inierphase SCC has been found For the microstructures resulting from furnace cooling,SCC initiated and propagated preferentially along theα2/βinterphase boundaries,displaying the microstructure on the fracture surface of SCC.However,there is no interphase SCC for the microstructure resulting from air cooling.

关键词: :Ti-24Al-11Nb , null , null , null

NONLOCAL THEORY STUDY ON FRACTURE TOUGHNESS OF CERAMIC MATERIALS

X.H.Song(Centre for Materials Research and Analysis , Wuhan University of Technology , Wuhan 430070 , China Manuscript received 6 November 1995 , in revised form 24 May 1996)

金属学报(英文版)

The theoretical calculation formulas for the plane strain fracture toughness of mode Ⅰand Ⅱcracks of ceramic materials are deduced in this paper by using the nonlocal elasticity theory and maximum tensile stress criterion The deduced formulas, which are independent of crack geometry,bear a relation to material parameters.It is shown through experiment that the theoretical value of fracture toughness is the lower limit of testing value. The theoretical calculation formulas for fracture toughness relate the macro-mechanical performance of materials with the micro-structural parameters and,therefore, are beneficial to fully understanding the physical mechanism of material rupture.

关键词: :nonlocal elasticity theory , null , null

Practice for Extending Blast Furnace Campaign Life at Wuhan Iron and Steel Corporation

ZHANG Shourong

钢铁研究学报(英文版)

One of the problems encountered in 60′s to 80′s of 20th century in China′s steel industry was short life of blast furnace shaft as well as the excessive erosion of blast furnace hearth. A series of research work was carried out in order to extend blast furnace campaign life. The concept of research and development was integrated in the construction of BF (blast furnace) No5 at WISCO (Wuhan Iron and Steel Corporation), and in October, 1991, the BF No5 was blown in. The blast furnace has worked smoothly for more than 15 years without any medium repair even guniting. It is expected that the campaign life of BF No5 would be longer than 16 years with a production over 11 000 t per unit inner volume (m3). A new blast furnace with an inner volume of 3 400 m3 is under construction, and is designed with a campaign life of 20 years without any medium repair. The campaign life of blast furnaces in China has been extended in recent years.

关键词: blast furnace;campaign life;erosion

Practice for Extending Blast Furnace Campaign Life at Wuhan Iron and Steel Corporation

钢铁研究学报(英文版)

关键词:

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:

Application of Low-penetration Concrete as the Protecting Layer in Wuhan Yangtse River Tunnel Tube

武汉理工大学学报-材料科学版(英文版)

关键词:

Effects of TMCP Parameters on Microstructure and Mechanical Properties of Hot Rolled Economical Dual Phase Steel in CSP

TAN Wen , HAN Bin , WANG Shui-ze , YANG Yi , ZHANG Chao , ZHANG Yong-kun

钢铁研究学报(英文版)

Effects of chemical compositions, finish rolling temperature, isothermal temperature on runout table and coiling temperature on microstructure and mechanical properties of economical dual phase steel produced on CSP line were investigated. Experimental results showed that martensite volume fraction could be enhanced and banding microstructure could be reduced by controlling Mn, Si contents and applying proper finish rolling temperature. Optimized processing-parameters were obtained for DP580 production on CSP line of Wuhan Iron and Steel (group) Co (WISCO) in China. Optimal microstructure and mechanical properties could be achieved when the strip was finished rolling at the range of 790 to 830 ℃, isothermally holding at 680 to 740 ℃ and coiling below 250 ℃.

关键词: economical dual phase steel , mechanical property , banding microstructure , processing-parameter

用旋转电极研究低碳钢阳极溶解机理

吴庆余

中国腐蚀与防护学报

用旋转电极研究低碳钢阳极溶解机理吴庆余（武汉工学院武汉４３００７０）１前言钢铁的溶解过程非常复杂，不同的研究者得出的溶解机理不同［１－６］。其原因主要是由于所用材料及所处介质不同等多种因素造成。本工作参照工业锅炉盐酸酸洗的实际工况，在含有较大ＣＩ－浓度（１．５ｍｏｌ／Ｌ）的酸性介质中，测定低碳钢阳极溶解过程的电化学参数，以探求反应历程和动力学方程式。２实验方法研究电极用２０钢制成圆盘状，四周?...

关键词: null , Mechanism , Acidic chloride media

Reply to "Comment on 'Low-temperature lattice excitation of icosahedral Al-Mn-Pd quasicrystals' "

Physical Review B

In response to the comment by Wang and Qin, we have rewritten our equation (22) following the coordinate system of Dina, et al. [J. Wuhan Univ. (Nature Science Edition) 3, 23 (1992)]. According to the thermodynamic stability condition and the experiment of Capitan et al., we have chosen the new parameters of the phason elastic constants. Based on this, we have recalculated the coefficients of the expressions on the vibrational denty of states and the specific heat of the icosahedral Al-Nin-Pd quasicrystal. Our results are still in agreement with the experimental data measured by Walti et al. [Phys. Rev. B 57, 10 504 (1998)]. It demonstrates that our method is useful for dealing with the low-temperature vibrational excitation of icosahedral quasicrystals.

关键词: quasi-crystals;diffuse-scattering

Treatment of Reused Comprehensive Wastewater in Iron and Steel Industry With Electrosorption Technology

ZHANG Yunhua , GAN Fuxing , LI Meng , WANG Dihua , HUANG Zhongmai , GAO Yunpeng

钢铁研究学报(英文版)

Electrosorption technology was used to treat the reused comprehensive wastewater from iron and steel industry. A problem of relatively high conductivity of wastewater which greatly affects the reuse was examined, and industrial test was conducted for the reused water advanced deionization and purification in a comprehensive wastewater treatment plant of WISCO [Wuhan Iron and Steel (Group) Corporation]. The results of the onsite industrial test showed a satisfactory treatment performance for the reused water even at a flow rate of 1000 L/h in a standard 500 L/h unit. The average conductivity decreased by about 70%, from 580-780 μS/cm to 100-350 μS/cm. The average removal efficiency of Cl- and Ca2+ was about 75% and 68%, respectively, and CODCr of the treated water was also reduced in some degree while the pH value was almost unchanged. The energy consumption was as low as 06 kWh/t, which was remarkably superior to the conventional technologies. Therefore, it is entirely feasible that the novel electrosorption technology can be used in enhanced desalination and purification treatment of reused comprehensive wastewater in iron and steel industry.

关键词: electrosorption , desalination , purification , conductivity , industrial reused water