Improvement of mechanical properties in SUS304L steel through the control of bimodal microstructure characteristics

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:598

Article

Zhang, Zhe¹  Vajpai, Sanjay Kumar²  Orlov, Dmitry²  Ameyama, Kei³ 

[1] Ritsumeikan Univ, Dept Mech Engn, Grad Sch Sci & Engn, Kusatsu, Shiga 5258577, Japan

[2] Ritsumeikan Univ, Res Org Sci & Technol, Kusatsu, Shiga 5258577, Japan

[3] Ritsumeikan Univ, Fac Sci & Engn, Dept Mech Engn, Kusatsu, Shiga 5258577, Japan

关键词: Stainless steel;    Microstructure design;    Bimodal grain structure;    Harmonic structure;    Mechanical property;   

DOI  :  10.1016/j.msea.2014.01.023

来源: Elsevier

【 摘 要 】

The present work deals with achieving improvement in the mechanical properties of SUS304L stainless steel through the application of a unique microstructure design termed as 'Harmonic structure', and establishing a co-relationship between various microstructural characteristics and mechanical properties. Harmonic structure essentially means a bimodal grain size distribution with a specific periodic arrangement of coarse- and ultrafine-grain fractions. SUS304L stainless steel samples having such microstructure were fabricated by a powder metallurgy route involving the mechanical milling of pre-alloyed steel powder followed by spark plasma sintering. Due to these peculiar microstructural characteristics, the harmonic-structured SUS304L stainless steels demonstrated a winning combination of high strength, large uniform elongation, and large total elongation to failure, simultaneously. It was also found that the fraction of a shell area (a three-dimensional continuously connected network of ultrafine-grained structure) is an important parameter controlling the balance of the mechanical properties of the harmonic-structured SUS304L steel compacts. (C) 2014 Elsevier B.V. All rights reserved.

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