Enhanced ductility in harmonic structure designed SUS316L produced by high energy ball milling and hot isostatic sintering

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

卷:674

Article

Zheng, Ruixiao^2,3  Zhang, Zhe^1,3  Nakatani, Masashi³  Ota, Mie³  Chen, Xu¹  Ma, Chaoli²  Ameyama, Kei³ 

[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Adv Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

[3] Ritsumeikan Univ, Dept Mech Engn, Fac Sci & Engn, 1-1-1 Noji Higashi, Kusatsu, Shiga 5258577, Japan

关键词: Stainless steel;    Ultrafine grains;    Harmonic structure design;    Strength;    Mechanical milling;   

DOI  :  10.1016/j.msea.2016.07.048

来源: Elsevier

【 摘 要 】

The objective of the present study is to optimize the mechanical properties of commercial SUS316L stainless steel through harmonic structure design. The harmonic structured SUS316L compacts were fabricated by a process including high energy ball milling and subsequent hot isostatic pressing. Although the harmonic structured compacts had a bimodal grain size distribution, our investigations showed that both hardness and yield strength still well resembled the Hall-Petch relationship. A great combination of high yield strength and improved uniform elongation can be achieved simultaneously in the harmonic structured SUS316L compacts (sigma(y)=695 MPa, epsilon(u)=27.1%). The improved ductility was attributed to both the strain hardening induced by the coarse-grained structure and the extra strain hardening caused by the peculiar macroscopic network of ultrafine-grained structure. It was suggested that core grain size of approximately 1.2 mu m and shell volume fraction of approximately 50-60% were the optimized harmonic structure design for austenite stainless steel. (C) 2016 Elsevier B.V. All rights reserved.

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