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REDISTRIBUTION OF IMPURITY ATOMS AI, Si, Mn AND Cu IN Ni DURING LASER MELTING

ZHENG Ling , Chongqing Institute of Communications , Chongqing , ChinaZOU Zhirong , LIU Jianglong , Chongqing University , Chongqing , China ZHENG Ling , Lecturer , Department of Mechanical Engineering , Chongqing Institute of Communications , Chongqing 630074 , China

金属学报(英文版)

An explanation of the redistribution of impurity atoms such as Al, Si, Mn and Cu in pure nickel during low speed laser melting is made by one-dimensional analysis model for heat transfer. The solid-liquid interface solute redistribution seems to be the principal cause that makes the impurity atoms redistribute in the depth direction. The diffusion of impurity atoms from low to high temperature zones and their surface selective evaporation are believed to be noticeably contributed to the redistribution.

关键词: Ni , null , null , null

KINETICS OF DESULFURIZATION OF LOW TITANIA SLAG IN BLAST FURNACE

YAN Yuzhang , LAN Hong , Chongqing University , chongqing , China YAN Yuzhang , Associate Professor , Department of Metallurgy and Materials Engineering , Chongqing University , Chongqing 630044 , China

金属学报(英文版)

The desulphurizing reaction of the blast furnace low titania slag under the condition of no external agitation is confirmed to be of a first order. The controlling step is the diffusion of S in slag. The measures to accelerate the rate of desulfurization are approached.

关键词: low titania slag , null , null , null

Study of Iron-based Surface Composite Materials

Gongqi SHP , Peidao DING , Shouze ZHOU and Jianxing TANG (Dept. of Metallurgy and Materials Engineering , Chongqing University , Chongqing , 630044 , China)

材料科学技术（英文）

new surface infiltrating composite technique has been developed to obtain metal and ceramic composite layer on the surface of metal by traditional casting method. It has been shown that with the new method, a composite layer with a thickness of 2-5 mm can be obtained. The ceramic particulates distribute uniformly in the matrix. The composite layer is very favorable to wear resistance and thermal resistance situations

关键词:

CARBIDE PRECIPITATION AND BAINITE TRANSFORMATION IN Fe-C-Si ALLOY

R.L. Zuo , L. Fang and P. D. Ding(Department of Metallurgy and Materials Engineering , Chongqing University , Chongqing 630044 , China)

金属学报(英文版)

The upper bainite formed isothermally at 480℃ C in Fe-0. 38C-1. 73Si alloy was studied by using transmission electron microscopy (TEM). It was found by electron diffraction and crystallographic analysis that bainitic carbide precipitation originated from bainitic ferrite (BF), in which the initial supersaturation did not come up to the average carbon content of the alloy. It is suggested that bainite transformation in steel should be a coupled process of transformation dislocation movement controlled by carbon diffusion in austenite.

关键词: : bainite , null , null , null

MORPHOLOGY OF AMORPHOUS SILICA DURING ALUMINUM REACTIVE PENETRATION

Z. Zhou , Q.S. Gan and P.D. Ding College of Materials Science and Engineering , Chongqing University , Chongqing 400044 , China

金属学报(英文版)

The reduction of the volumes of the silica glass during aluminum reactive penetration was observed experimentally. The liquid aluminum infiltrates easily into the cavities while the released silicon solves in the liquid aluminum, and Al/A1_2 O_3 composites could be obtained finally. The experimental result has shown that Al/A1_2 O_3 composites could transform into A1_2O_3 grains by oxygen in the cavities of Al/A1_2O_3 composites during longer penetration treatment. The formation of alumina is a sintering process, in which liquid aluminum, particulate alumina and oxygen play an important role. Tin nsformed process has shown that there is a relationship of σAl_2O_3

关键词: aluminum , null , null , null , null

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