控轧控冷工艺对高强度X100管线钢组织的影响.pdf

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1、第28卷第1期材料研究学报、b1．28No．120I4年1月CHINESEJOI『IiNAL0FMATERIALSRESEARCHJanuary20I4控轧控冷工艺对高强度XIO0管线钢组织的影响术段琳娜1,2陈宇刘清友贾书君贾成厂1．北京科技大学材料科学与工程学院北京1000832．钢铁研究总院工程用钢所北京1000813．中国石油工程建设公司北京100120摘要对一种X100管线钢进行热模拟试验，研究了过冷奥氏体的相变规律，提出了一种得到以粒状贝氏体+板条贝氏体为主的混合组织的控轧控冷工艺制度，分析了精轧变形量、冷却速度及终冷

2、温度对实验钢微观组织的影响。结果表明，随着变形量的增大实验钢的微观组织逐渐细化，高强度的板条贝氏体含量减少而粒状贝氏体含量增多；随着冷却速度的增加和终冷温度的降低实验钢组织中的板条贝氏体含量明显提高，组织也逐渐细化；组织中板条贝氏体含量较高时实验钢具有较高的强度，但过多的板条贝氏体和针状M／A岛对材料的韧性造成不利的影响。关键词金属材料，XlO0管线钢，变形量，冷却速度，终冷温度，微观组织分类号TG142文章编号1005．3093(2o14)ol一0051-08Effect0fThermo．mechanicalControlPro

3、cessonMicrostructureofHighStrengthXIO0PipelineSteelDUANLinna，”CHE]yu3LIUQingyou2JIAshujunJIAChengchang．SchoolofMaterialScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing1000832．1nstitutefo，EngineeringSteel,CentralIronandSteelResearchInstitute,Beijin

4、g1000813．ChinaPetroleumEngineeringandConstructionCorporation，Beijing100120SuppoSedbyNational”TwelfthFive-Year”PlanforScience&TechnologySupportNo．2011BAE35B01．ManuscriptreceivedMay17，2013；inrevisedformJuly25，2013．料Towhomcorrespondenceshouldbeaddressed，Tel：(010)62182765

5、，E—mail：duanlinna83@sina．comABSTRACTThetransformationofundercoolingausteniteinaX100pipelinestee1wasinvestigatedbymeansofthermaIsimulationtest．Basedontheobtainedresults．athermo-mechanicalcontroIprocess(TMCP)bywhichamixedmicrostructuremainlyconsistedofgranularbainiteand

6、lathbainitecanbeob．tainedhasbeenproposedandefectsoffinishrollingdeformationamount，coolingrateandfinaIcoolingtemperatureonmicrostructurehavebeenanalyzed．TheresultsshowthatthemicrostructuraoftestedsteeIgraduallyrefinesandthevolumefractionoflathbainitedecreaseswiththeinc

7、reaseofdeformationamount．WiththeincreaseofcoolingrateandthedecreaseoffinaIcoolingtemperature．microstructurerefinesandvolume~actionofJathbainitejncreasesobviously．HighvolumefractionofJathbainiteinmi-crostructureiSgoodforhighstrength．However,excessivelyhighvolumefractio

8、nofIathbainiteandM／Ajslandswiththeshapeofacicularhaveharmfulinfiuencesontoughness．KEYWORDSmetaIlicmaterials，X10Opipelinestee