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In this paper, the collapsing fracture of 60Si2Mn spring flat steels during cold-punching is analyzed by use of an optical microscope, a scanning electronic microscope, an optical stereomicroscopy, an energy dispersive spectrometer, an inductively coupled plasma-mass spectrometry, the hardness testers and a Charpy impact tester. The results show that the collapsing fracture of 60Si2Mn spring flat...
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