X80管线钢焊接热影响区组织性能改善措施.pdf

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1、赵波等：X80管线钢焊接热影响区组织性能改善措施X80管线钢焊接热影响区组织性能改善措施赵波，李国鹏，王旭，谷雨2，肖福仁(1．中国石油集团渤海装备研究院输送装备分院，河北青县062658；2．燕山大学材料科学与工程学院，河北秦皇岛066004)摘要：采用热模拟试验方法，研究了一种X80管线钢热影响区在不同冷速、焊接线能量和峰值温度下的金相组织和力学性能变化规律。试验表明：适当提高焊缝热影响区冷速可以改善其组织和强韧性能：在相同焊接线能量的条件下．试验X80钢焊接热影响区的临界区、粗晶区冲击韧性最差并分别出现一处谷

2、值，细晶区强度最差；采用较小线能量焊接有利于改善热影响区综合强韧性；采用高熔敷率复合高效多丝埋弧焊低线能量化焊接工艺、随焊加速冷却工艺、焊后焊缝及热影响区局部中频正火热处理工艺．可以有效改善X80管线钢热影响区强韧匹配性能。关键词：x80管线钢；组织性能；低线能量化焊接；随焊加速冷却；局部中频正火中图分类号：TG142．1文献标志码：B文章编号：1001—3938(2014)04—0047—08DiscussiononImprovingProcessingMeasureofWeldingHAZMicrostruct

3、urePerformanceforX80PipelineSteelZHAOBo，LIGuopeng，WANGXu，GUYH2,XIAOFuren(1．ResearchInstituteofCNPCBohaiEquipmentManufacturingCo．，Ltd．，Qingxian062658，Hebei，China；2．CollegeofM~eridsScienceandEngineering，YanshanUniversity，Qinhuangdao066004，Hebei，China)Abstract：By

4、usingthethermalsimulationtest，thechangingrulesofthemetallurgicalstructureandmechanicalpropertiesofweldHAZofX80pipelinesteelunderdifferentcoolingrates，weldingheatinputsandpeaktemperatureswerediscussedinthisessay．Thetestsshowedthat：Appropriateincreaseofthecoolin

5、grateintheweldHAZcanimprovethemicrostructure，strengthandtoughhessoftheweldHAZ；underthesameweldingheatinput，theimpacttoughhessofthecriticalzoneandthecoarsegrainzonearepoorandavalleyoccursrespectivelyinthesetwozones，thestrengthofthefinegrainzoneisthelowest；weldi

6、ngadoptingarelativelylowheatinputisbeneficialtoimprovethecomprehensivestrengthandtoughnessofweldHAZ．Accordingtoanalysisresult，aweldingprocedurewithhighdepositrate，high—eficiencymulti-wiresubmergedarcweldingandlowerheatinput，asimultaneousacceleratecoolingproces

7、s，andalocalintermediate-frequencynormalizingtreatmentofweld&HAZpost-weldingcanefectivelyimprovethecomprehensivestrength-toughnessperformanceofweldHAZofpipelinestee1．Keywords：X80pipelinesteel；microstructureproperty；lowheat—inputwelding；acceleratedcoolingalongwi

8、thwelding；localintermediate—frequencynormalizingtreatment0前言出了越来越高的要求。目前X80高性能管线钢的生产技术日益成熟，已大规模地用于管道建随着油气管道高压、长距离、大管径输送技设，已建成的西气东输二线工程是世界上输送距术的发展，对管线钢的强度、韧性和焊接性能提离最长的X80油气管线。HANGUA