MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Influence of Strain-Induced Martensitic Transformation of Austenitic Stainless Steel Sheet in Precision Blanking on Cut-Surface Quality
Yohei SuzukiTomomi ShiratoriMing YangMasao Murakawa
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2020 Volume 61 Issue 2 Pages 295-299

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Abstract

The main purpose of precision blanking in press stamping is to suppress fracture of the cut surface. The principle is attainable by applying hydrostatic stress on the workpiece by various contrivances, so that the workpiece can maintain its ductility for suppression of fracture. Stainless steel, which is commonly used in medical components, is also known to be a ductile material, but one of problematic characteristics of austenitic stainless steel is martensitic transformation. The phenomenon is that the ductile austenite phase is changed to the brittle martensitic one by processing strain. Therefore, in this study, the effect on the cut surface from martensitic transformation near it in the precision blanking process was investigated. As a result, it was proved that there was a difference in the occurrence or non-occurrence of fracture of the cut surface due to the difference in the strain-induced martensitic transformation.

Fig. 4 Phase map of cross section for JIS SUS304 and 316L materials. Fullsize Image
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© 2020 The Japan Institute of Metals and Materials
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