Microstructure and Mechanical Properties of Ultra-high Strength Steel with Different Cooling Process
- 10.2991/lemcs-15.2015.108How to use a DOI?
- Ultra-high strength steel; Component design; Short flow processes; Microstructure transformation; Residual austenite
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.
- © 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
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 -