Influence of high-frequency micro-forging on microstructure and properties of 304 stainless steel fabricated by laser rapid prototyping

Yan Zhang, Chang Jun Qiu, Yong Chen, Jinshui Yu, Ju Zhou, Linsheng Li, Zhongchang Wang

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    We report the fabrication of the 304 stainless steel by the laser rapid prototyping harmonized with high-frequency micro-forging and demonstrate that both microstructure and properties of the prepared samples can be enhanced significantly. Structurally, we find that the large regular dendritic microstructure can be broken into pieces and that the internal defects are to some extent eliminated. Moreover, grains are refined remarkably. As a consequence of such structural modification, mechanical properties are found to be enhanced considerably by demonstrating a much broader fluctuation in tensile strength, a marked increase in tensile and yielding strength, and a drastic enhancement in surface hardness by 76% after the micro-forging. Further calculations reveal that the defect region is shrunken substantially after micro-forging. Detailed analysis of fractures in the tensile samples provides convincing evidence that plastic properties can be improved as well by the micro-forging. We report the use of a new technology to fabricate the 304 stainless steel by the laser rapid prototyping harmonized with high-frequency micro-forging and demonstrate that microstructure and properties of the prepared steels are enhanced significantly. This new method may hold technological promise for improving the fabrication of the 304 stainless steel so as to suit practical applications in industrial aerospace or other aspects.

    Original languageEnglish
    Pages (from-to)870-877
    Number of pages8
    JournalSteel Research International
    Volume84
    Issue number9
    DOIs
    Publication statusPublished - 2013 Sep

    Keywords

    • 304 stainless steel
    • high-frequency micro-forging
    • laser rapid prototyping
    • mechanical properties

    ASJC Scopus subject areas

    • Materials Chemistry
    • Metals and Alloys
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry

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