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| Study on High Temperature Mechanical Properties of CSP Q235B Slab |
| WU Guangliang1,3，SUN Yanhui2，ZHOU Chunquan1，CAI Kaike2，LI Zhengbang3 |
| 1. Chief Engineer Office, Lianyuan Iron and Steel Group Co. Ltd., Loudi 417009, Hunan, China; 2. Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China;3. Technology Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The high temperature mechanical properties of CSP slab have been investigated by Gleebe1500 hot simulator. The horizontal and vertical section of samples were observed by optical microscope and SEM at 800 ℃, 900 ℃, 1100 ℃. The morphology of fracture was analyzed by TEM, and segregation at grain boundaries and inclusions have been analyzed by XEDS. The test results showed that there are two temperature areas of brittleness for slab produced by CSP within 600～1320 ℃, the first temperature area of brittleness(Ⅰ) is 1320～1200 ℃, the second temperature area of brittleness(Ⅲ) is 600～1000 ℃, the steel is plastic within 1000～1200 ℃, and Z=8.46％ at 800 ℃. There are two reasons for Ⅲ temperature area of brittleness, the first is the stress concentrated caused by precipitation of deformation induced ferrite, the second is precipitation of nitride(AlN) at austenitic boundaries, and the essence of cracking of CSP slab is the nitride(AlN) precipitation at austenitic grain boundaries, making stress concentrated and voids formed, grew up and aggregated.
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Received: 01 January 1900
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2006, Vol. 41 