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Characteristics of metal magnetic memory signals
of different steels under static tension |
| Yiliang ZHANG,Ruibin GOU,Jimin LI,Gongtian SHEN, |
| College of Mechanical
Engineering and Applied Electronics Technology, Beijing University
of Technology, Beijing 100022, China; |
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Abstract To study the characteristics of metal magnetic memory (MMM) signals of different steels during tensile test, static tension tests were applied to 30 pieces of Q235 and 16MnR base metal and welded specimens. During the various deformation periods, MMM signals are tested, and micrometallographic is observed. Furthermore, the derivative of magnetic intensity (dHp/dx) is analyzed by mathematical and statistical methods to study the macro and micro corresponding relationships and difference among magnetic signals. Results show that despite the different magnetic intensity (Hp) curves of different materials, their dHp/dx patterns in the yielding and necking stages are the same; welded specimens have the similar magnetic signal curves with their base metal, and the welded structure does not interfere with its Hp distribution; different materials have their unique zero point (Hp＝0) before being fractured, which is independent of the fracture location; there is a direct relationship between the intragranular slip and the changes of magnetic signals, which indicates the uneven plastic deformation.
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| Keywords
metal magnetic memory (MMM)
magnetic intensity (Hp)
static tension
weld
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Issue Date: 05 June 2010
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