A novel method to define the effective average grain size of the materials with lath-typed microstructure: An example of medium manganese steel

被引：9
|
作者：
Zhang, Yu [1 ,2 ]
Ding, Hua [3 ]
Zhu, Haokun [1 ,2 ]
Zhang, Yutong [1 ,2 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Key Lab Lightweight Struct Mat Liaoning Prov, Shenyang 110819, Peoples R China
[3] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China
来源：
VACUUM | 2021年 / 191卷
基金：
中国国家自然科学基金;
关键词：
Yield strength; Hall-petch relationship; Effective average grain size; Medium Mn steel; Ultrafine grained microstructure; MECHANICAL-PROPERTIES; UNIFORM ELONGATION; YIELDING BEHAVIOR; IF STEEL; ULTRAFINE;
D O I：
10.1016/j.vacuum.2021.110313
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on the mechanism of dislocation pile-up, a novel and concise method is proposed to define the effective average grain size of the medium Mn steel with the lath-typed microstructure. In order to investigate the HallPetch relationship of the medium Mn steel with different microstructural morphologies, the granular and lathtyped microstructures are fabricated by intercritical annealing (IA) and austenite reversed transformation (ART), respectively. The yield strength of the ART sample (lath-typed microstructure) exhibits excellent consistency with the Hall-Petch relationship obtained from the IA sample (granular microstructure) when adopting the effective average grain size, indicating the feasibility of the proposed method. In addition, the effect of grain size on the mechanical properties is also investigated.
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页数：4
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