Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 14    No. 3    June 2004

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Microstructures and properties of welded joint of TiNi
shape memory alloy and stainless steel
QIU Xiao-ming(邱小明), SUN Da-qian(孙大谦), LI Ming-gao(李明高), LIU Wei-hong(刘卫红)

School of Materials Science and Engineering, Jilin University, Changchun 130025, China

Abstract:The fracture characteristics of the joint were analyzed by means of scanning electron microscope(SEM). Microstructures of the joint were examined by means of optical microscope, SEM and an image analyzer. The results show that the tensile strength of the inhomogeneous joint of TiNi shape memory alloy and stainless steel is lower than that of the homogeneous joint and a plastic field appears in the heat affected zone on the side of TiNi shape memory alloy. Because Ti-
Ni shape memory alloy and stainless steel melted, a brittle as-cast structure was formed in the weld. The tensile strength and the shape memory effect of the inhomogeneous joint are strongly influenced by the changes of composition and structure of the joint. Measures should be taken to reduce the base metal melting and prevent the weld metal from the invasion by O for improving the properties of the TiNi shape memory alloy and stainless steel inhomogeneous joint.

 

Key words: TiNi shape memory alloy; stainless steel; welding; tensile strength; structure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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