Effect of prior austenite grain size on the tensile properties and fracture toughness of nano-structured bainite

被引：26

作者：

Chhajed, Bhawesh ^{[1
]}

Mishra, Kushal ^{[1
,2
,3
]}

Singh, Kritika ^{[4
]}

Singh, Aparna ^{[1
]}

机构：

[1] Indian Inst technol, Dept Met Engn & Mat Sci, Mumbai, India

[2] Indian Inst Technol, Monash Res Acad, IITB, Mumbai 400076, India

[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia

[4] Helmholtz Zentrum Hereon, Inst Mat Phys, D-21502 Geesthacht, Germany

来源：

MATERIALS CHARACTERIZATION | 2022年 / 192卷

关键词：

Nano-bainite; Prior austenite grain size; Fracture toughness; Strength; MECHANICAL-PROPERTIES; RETAINED AUSTENITE; SILICON STEELS; STRENGTH; TRANSFORMATION; MORPHOLOGY; AL; MICROSTRUCTURE; DUCTILITY; EVOLUTION;

D O I：

10.1016/j.matchar.2022.112214

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Prior austenite grain size (PAGS) can significantly impact the bainitic lath thickness formed during austempering of high carbon steels. This study examines the effect of two different PAGS on the microstructure development and in turn the tensile properties and fracture toughness of nano-structured bainitic steels. Two PAGS have been obtained by austenitizing at 900 & DEG;C and 1000 & DEG;C respectively but the bainite fraction has been maintained to be around the same range by austempering at 250 & DEG;C. Less amount of blocky austenite is formed when the PAGS is larger. It is also observed that with an increase in the PAGS, the thickness of bainitic lath and retained austenite (RA) decreases and the tensile strength, tensile ductility and the plane strain fracture toughness is enhanced. The fraction of RA transformed to martensite is less for larger PAGS during a tensile test while showing greater ductility owing to the greater stability of finer RA films.

引用

页数：10

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