| Autor: |
Shou Yong An, Yong Lin Kang, De Liang Meng, Dian Xiu Xia |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Advanced Materials Research. :323-327 |
| ISSN: |
1662-8985 |
| DOI: |
10.4028/www.scientific.net/amr.299-300.323 |
| Popis: |
Two kinds of X80 high deformability pipeline steels have been processed by applying two-stage cooling process (TSC) and heat treatment on-line process (HOP). The microstructure of TSC steel and HOP steel are polygonal ferrite (PF) + quasi-polygonal ferrite (QF) + granular bainite (GB) multiphase and QF + GB+ martensite-austenite (M/A) multiphase respectively. In HOP steel, the volume of M/A is much more and the size is much larger than that in TSC steel. Some degenerated M/A constituents are also observed in HOP steel. The HOP steel has shown higher tensile strength, lower yield ratio and lower uniform elongation than TSC steel. The strain-nI (instantaneous n-value) curve of HOP steel could be divided into two stages and the TSC’s could be separated to three stages. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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