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Experimental on process, microstructure and mechanical properties of X80 high strength pipeline steel for low temperature |
DUAN He1,2, SHAN Yi-yin1, YANG Ke1, SHI Xian-bo1, YAN Wei1, REN Yi3 |
1. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, Liaoning, China; 2. School ofMaterials Science and Engineering, University of Science and Technology of China, Hefei 230000, Anhui, China; 3. State Key Laboratory of Metal Materials and Application for Marine Equipment, Anshan 114009, Liaoning, China |
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Abstract As the pipeline extends to low temperature areas,higher requirements are imposed on the low temperature performance of the pipeline. In order to break through the bottleneck of the strength and toughness balance of high strength pipeline steel laid in the low-temperature region,it is necessary to optimize the microstructure and the thermal mechanical controlled process (TMCP) of the commercial available pipeline steel. In order to study the relationship between the TMCP parameters and the complex microstructure to guide the actual rolling process,the Gleeble thermal simulator was used to observe the different microstructures by changing the cooling rate,finishing rolling temperature,finishing cooling temperature and relaxed time,and then,the change rule in the different microstructures was analyzed. The results showed that with increase of the cooling rate,the volume percent of polygonal (quasi-polygonal) ferrite decreased but that of the bainitic ferrite increased. With increase of the finishing rolling temperature,the grains were coarsening but the fraction of acicular ferrite was basically unchanged. When the finishing cooling temperature was raised to 550 ℃,severely coarsened microstructure was emerged and a large number of MA islands with sharp-angled shape which are harmful to the low temperature toughness appeared. When the relaxed time was prolonged,the grain size and the volume percent of polygonal ferrite were both gradually increased. Based on the results on properties,a microstructure composed of fine quasi-polygonal ferrite (PF),granular bainite (GB) and a small amount of bainitic ferrite (BF) (QF+GB accounted for more than 90%) was designed for the X80 pipeline steel used in extremely-cold region. In this microstructure,the percentage of high angle grain boundaries was more than 50%. Finally,the industrial TMCP parameters such as finishing rolling temperature,finishing cooling temperature and cooling rate were optimized to be 750 ℃,480 ℃ and 20 ℃/s,respectively,which made the X80 pipeline steel with excellent low temperature impact toughness,satisfying the requirements of comprehensive properties,especially in the extremely-cold region.
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Received: 17 May 2019
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