Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science

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Microstructure and Mechanical Properties of Ultra-high Strength Steel with Different Cooling Process

Authors
Yongli Chen, Jianguo Huang, Xuejiao Zhou, Zhao Yang
Corresponding Author
Yongli Chen
Available Online July 2015.
DOI
10.2991/lemcs-15.2015.108How to use a DOI?
Keywords
Ultra-high strength steel; Component design; Short flow processes; Microstructure transformation; Residual austenite
Abstract

Influences of different coiling processes on microstructure transformation and mechanical properties and microstructure of ultra-high strength steels (UHSS) were investigated. Microstructure and distribution characteristics were obtained. Samples were proceeded by a controlled rolling (CR) followed by a second step of the direct air cooling (AC), controlled cooling (CC) and direct quenching(DQ), respectively. Experimental results of CR+AC process showed that hot rolling microstructure was 0.2-0.3 m slender bamboo-like lath bainitic ferrite. CR+CC process acquired higher strength 0.2=915MPa, b=1640MPa, better tenacity and lower yield ratio 0.2/ b=0.56, kv=52.13J•cm1/2. Ductile fracture happened during CR+AC. Multiple rupture mechanisms of quasi-cleavage and ductile fracture existed in CR+CC process. Blockish structure and volume fraction of retained austenite decreased, while carbon content increased compared with CR+AC process. The fracture of the alloys was observed to be in quasi-cleavage failure mode during CR+DQ process, blocky structure in retained austenite disappeared basically, volume fraction and carbon content lower than that in CR+CC process.

Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science
Series
Advances in Intelligent Systems Research
Publication Date
July 2015
ISBN
10.2991/lemcs-15.2015.108
ISSN
1951-6851
DOI
10.2991/lemcs-15.2015.108How to use a DOI?
Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

risenwbib
TY  - CONF
AU  - Yongli Chen
AU  - Jianguo Huang
AU  - Xuejiao Zhou
AU  - Zhao Yang
PY  - 2015/07
DA  - 2015/07
TI  - Microstructure and Mechanical Properties of Ultra-high Strength Steel with Different Cooling Process
BT  - Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science
PB  - Atlantis Press
SP  - 564
EP  - 568
SN  - 1951-6851
UR  - https://doi.org/10.2991/lemcs-15.2015.108
DO  - 10.2991/lemcs-15.2015.108
ID  - Chen2015/07
ER  -