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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 3    June 2001

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Microstructures and properties
of tungsten inert gas welding joint
of super-eutectic ZA alloy
LIU Xiu-zhong(刘秀中)1, DONG Bo-ling(董博玲)1,
ZHAO Dong-jian(赵东建)1, ZHU Xing-hai(朱兴海)2

1. School of Materials Science and Engineering,
Shandong University, Ji′nan 250061, P.R.China;
2. Jinan Research and Inspect Institute of Boiler and
Pressure Container, Ji′nan P.R.China

Abstract:  The microstructure of butt-welding joint of supper-eutectic ZA alloy in TIG welding was analyzed through optical microscope and transmission electronic microscope. The results show that the weld seam microstructure is fine and mainly composed of columnar crystals and minor equiaxed crystals, the microstructure in the zone near the weld seam is coarse columnar crystals, and the grain in heataffected zone does not grow markedly. The joint microstructure at room temperature is consisted of β phase (rich Al), η-Zn,ε phase (CuZn compound), Al4Cu9 and other compounds. The hardness of the weld bond area and the tensile strength of the joint are a little higher than that of base materials. The specific elongation of the weld and bond area is a little lower than those of base materials.

 

Key words:  ZA alloy; welding joint; microstructure; properties

ISSN 1672-7029
CN 43-1423/U

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