中厚钢板超声波探伤不合格原因分析

(,115005):针对中厚钢板超声波探伤出现的两类典型缺陷,通过低倍检验和金相检验等手段,并结合实际探伤过程中缺陷的分布位置对探伤不合格的原因进行了分析结果表明:点状密集型缺陷主要与连铸坯的中心偏析有关,侧边条型缺陷则主要来源于连铸坯的三角区裂纹或靠近三角区的中心裂纹,钢板体部的条型缺陷则是由连铸坯的中间裂纹造成的:超声波探伤;密集型缺陷;条型缺陷;中心偏析;裂纹:TG142.1:B:1001-4012(2011)02-0123-03CauseAnalysisonDisqulificationoftheUltrasonicFlawDetectionintheHeavyandMediumPlateSUNWei(CentralLaboratory,MinmetalsYingkouMediumPlateCo.,Ltd.,Yingkou115005,china)Abstract:Twotypicalflawswerefoundinbothheavyandmediumplatebymeansofultrasonicflawdetection.Utilizingmacroscopicexaminationandmetallographicexaminationcombiningwiththedistributionoftheseflawsintheplate,theformingreasonoftheflawswasinvestigated.Theresultsshowthattheclusterflawswererelatedtothecentersegregationinthecontinuouscastingbillet.Stripyflawsonthenarrowsideoftheplatederivedfromthecrackswithinthetriangularzoneorcentralcracksclosetothetriangularzone.Furthermore,stripyflawsinsidethesteelplatemainlyresultedfromtheintermediatecracks.Keywords:ultrasonicflawdetection;clusterflaw;stripyflaw;centersegregation;crack,,,,,1/2;,:;;;,:100~300mm,1/2;,1/4,:2010-03-21:(1982-),,,,,,11.1,Q345R,,,,,,1,1/2,123孙伟:中厚钢板超声波探伤不合格原因分析,,,,,,1Fig.1Segregatedbandincentreofdisqualificationsteelplatebyultrasonicflawdetection,,2,,,,,,1/2,,,,,,,,,,,,2Fig.2Centercrackappearanceinthicknessdirection,3(),,,+,,,,4,3Fig.3Sulfideinthemicro-cracks4SEMFig.4SEMmorphologyofthemicro-cracks,1.2,,1/2,,5,,6140mm124孙伟:中厚钢板超声波探伤不合格原因分析,140~240mm,5Fig.5Cracksmorphologyinthicknessdirection6Fig.6Centercracksnearthetriangularzone1.3Q235C,,1mm,1mm,,(1/4),78,20mm,[1];,,,[2],,,,,,97Fig.7Intermediatecrackafteretching8Fig.8Cracksmorphologyinthicknessdirection9Fig.9Sulfidemorphologynearthecrackofthesteelplate2,,:[1],.[M].:,2009.[2],.[M].:,2007.125