Effect of austenite grain size on transformation of nanobainite and its mechanical properties

Tao Jiang; Hongji Liu; Junjie Sun; Shengwu Guo; Yongning Liu

doi:10.1016/j.msea.2016.04.041

Effect of austenite grain size on transformation of nanobainite and its mechanical properties

Tao Jiang
, Hongji Liu
, Junjie Sun
, Shengwu Guo
, Yongning Liu

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

Nanobainite steels display an excellent combination of outstanding strength and ductility. However, the transformation rate and impact toughness of nanobainite still need to be improved. In this work, the effect of refining austenite grain size to an ultrafine one on bainite transformation and its mechanical properties were investigated using a steel with composition of 0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co. The results show that refining austenite grain from 53 μm to 3 μm can accelerate the bainite transformation significantly, but almost half amount of the bainite is no longer typical nanostructured bainite, and plenty of undesirable blocky austenite which is harmful to the toughness of the steel remains at the same time. When grain is in medium dimension (18 μm), the best impact toughness of 51 J/cm² occurs with corresponding strength of 2034 MPa and ductility of 14%.

Original language	English
Pages (from-to)	207-213
Number of pages	7
Journal	Materials Science and Engineering: A
Volume	666
DOIs	https://doi.org/10.1016/j.msea.2016.04.041
State	Published - 1 Jun 2016

Keywords

Grain boundary diffusion
Mechanical properties
Nanobainite
Retained Austenite
Ultrafine grained microstructure

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10.1016/j.msea.2016.04.041

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title = "Effect of austenite grain size on transformation of nanobainite and its mechanical properties",

abstract = "Nanobainite steels display an excellent combination of outstanding strength and ductility. However, the transformation rate and impact toughness of nanobainite still need to be improved. In this work, the effect of refining austenite grain size to an ultrafine one on bainite transformation and its mechanical properties were investigated using a steel with composition of 0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co. The results show that refining austenite grain from 53 μm to 3 μm can accelerate the bainite transformation significantly, but almost half amount of the bainite is no longer typical nanostructured bainite, and plenty of undesirable blocky austenite which is harmful to the toughness of the steel remains at the same time. When grain is in medium dimension (18 μm), the best impact toughness of 51 J/cm2 occurs with corresponding strength of 2034 MPa and ductility of 14\%.",

keywords = "Grain boundary diffusion, Mechanical properties, Nanobainite, Retained Austenite, Ultrafine grained microstructure",

author = "Tao Jiang and Hongji Liu and Junjie Sun and Shengwu Guo and Yongning Liu",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = jun,

day = "1",

doi = "10.1016/j.msea.2016.04.041",

language = "英语",

volume = "666",

pages = "207--213",

journal = "Materials Science and Engineering: A",

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TY - JOUR

T1 - Effect of austenite grain size on transformation of nanobainite and its mechanical properties

AU - Jiang, Tao

AU - Liu, Hongji

AU - Sun, Junjie

AU - Guo, Shengwu

AU - Liu, Yongning

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Nanobainite steels display an excellent combination of outstanding strength and ductility. However, the transformation rate and impact toughness of nanobainite still need to be improved. In this work, the effect of refining austenite grain size to an ultrafine one on bainite transformation and its mechanical properties were investigated using a steel with composition of 0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co. The results show that refining austenite grain from 53 μm to 3 μm can accelerate the bainite transformation significantly, but almost half amount of the bainite is no longer typical nanostructured bainite, and plenty of undesirable blocky austenite which is harmful to the toughness of the steel remains at the same time. When grain is in medium dimension (18 μm), the best impact toughness of 51 J/cm2 occurs with corresponding strength of 2034 MPa and ductility of 14%.

AB - Nanobainite steels display an excellent combination of outstanding strength and ductility. However, the transformation rate and impact toughness of nanobainite still need to be improved. In this work, the effect of refining austenite grain size to an ultrafine one on bainite transformation and its mechanical properties were investigated using a steel with composition of 0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co. The results show that refining austenite grain from 53 μm to 3 μm can accelerate the bainite transformation significantly, but almost half amount of the bainite is no longer typical nanostructured bainite, and plenty of undesirable blocky austenite which is harmful to the toughness of the steel remains at the same time. When grain is in medium dimension (18 μm), the best impact toughness of 51 J/cm2 occurs with corresponding strength of 2034 MPa and ductility of 14%.

KW - Grain boundary diffusion

KW - Mechanical properties

KW - Nanobainite

KW - Retained Austenite

KW - Ultrafine grained microstructure

UR - https://www.scopus.com/pages/publications/84964515395

U2 - 10.1016/j.msea.2016.04.041

DO - 10.1016/j.msea.2016.04.041

M3 - 文章

AN - SCOPUS:84964515395

SN - 0921-5093

VL - 666

SP - 207

EP - 213

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Effect of austenite grain size on transformation of nanobainite and its mechanical properties

Abstract

Keywords

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