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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

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

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