Alternative TitleExperimental on process,microstructure and mechanical properties of X80 high strength pipeline steel for low temperature
段贺1; 单以银1; 杨柯1; 史显波1; 严伟1; 任毅3
Source Publication钢铁
Other AbstractAs 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.
Keyword热模拟 组织 TMCP 低温韧性 大角度晶界
Indexed ByCSCD
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Cited Times:4[CSCD]   [CSCD Record]
Document Type期刊论文
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GB/T 7714
段贺,单以银,杨柯,等. X80低温用高强度管线钢的工艺与组织性能试验[J]. 钢铁,2020,55.0(002):103-111,138.
APA 段贺,单以银,杨柯,史显波,严伟,&任毅.(2020).X80低温用高强度管线钢的工艺与组织性能试验.钢铁,55.0(002),103-111,138.
MLA 段贺,et al."X80低温用高强度管线钢的工艺与组织性能试验".钢铁 55.0.002(2020):103-111,138.
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