Experimental and numerical investigations on microcoining of stainless steel 304

Gap Yong Kim, Muammer Koç, Jun Ni

Research output: Contribution to journalArticle

25 Citations (Scopus)


Increasing demands for miniature metallic parts have driven the application of micro-forming in various industries. Only a limited amount of research is, however, available on the forming of miniature features in high strength materials. This study investigated the forming of microfeatures in Type 304 stainless steel by using the coining process. Experimental work was performed to study the effects of workpiece thickness, preform shape, grain size, and feature size on the formation of features ranging from 320 μm to 800 μm. It was found that certain preform shapes enhance feature formation by allowing a favorable flow of the bulk material. In addition, a flow stress model for Type 304 stainless steel that took into consideration the effects of the grain and feature sizes was developed to accurately model and better understand the coining process. Weakening of the material, as the grain size increased at the miniature scale, was explained by the Hall-Petch relationship and the feature size effect.

Original languageEnglish
Pages (from-to)410171-410176
Number of pages6
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Issue number4
Publication statusPublished - 1 Aug 2008
Externally publishedYes



  • Coining
  • Microforming
  • Size effect
  • Stainless steel

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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