不同组配P91钢焊接接头断裂性能的试验研究.pdf

焊接·切割(3)WWeellddiinngg ●试验与研究● 不同组配P91钢焊接接头断裂性能的试验研究 李继红,周小华 ,张敏,付翀 (西安理工大学材料科学与工程学院,陕西 西安 ) 710048 摘 要:采用 阻力曲线试验方法,研究了强度组配对 钢焊接接头不同区域断裂性能的影响规律,并分 J P91 R 析了不同组配P91钢焊接接头的硬度分布。结果表明,焊接热循环对其热影响区的性能没有明显的影响;低组配 焊接接头焊缝区的断裂阻力要高于高组配焊接接头焊缝区的断裂阻力,即强度低组配有利于提高P91钢焊缝的 抗断性能;对于熔合线区域,试验结果体现出类似的规律,即随组配比的降低,熔合线区域的抗断性能升高;而无 论何种强度组配的P91钢焊接接头,其焊缝金属的抗断性能均优于熔合线区域。 关键词: 钢;焊接接头;强度组配;断裂阻力 P91 中图分类号: 文献标识码: 文章编号: ( ) TG407;TG115.5 A 1001-3814200701-0001-02 StudyonFracturePropertiesofP91SteelMis-matchingWeldedJoints LIJi-hong,ZHOUXiao-hua,ZHANGMin,FUChong (SchoolofMaterialsScienceandEngineering,XianUnivercityofTechnology,Xian710048,China) Abstract:Theinfluenceofthestrengthmis-matchingonthefracturepropertiesofthedifferentregionsinP91steel weldmentswasstudiedbytheJresistancecurvemethod.Andthehardnessdistributionalongstrengthmis-matchingP91 R steelweldmentswasanalyzed.Theresultsshowthattheweldingthermal-cycleonitsmechanicalpropertyoftheHAZ hasnoevidenceeffect.Thefractureresistanceoftheweldedjointsofthelow-matchedP91steelweldmentishigherthan thatofhigh-matchedweldment,thatis,thelowerstrengthmatching-ratio(theweldmetalstrengthtothebasemetal strength)isfavorabletoimprovethefracturepropertiesoftheweldmetal.Forthefusionline,theexperimentalresults arethesimilarruletothatoftheweldmetal,namely,thefractureresistanceoffusionlineincreaseswiththedecreasing ofthestrengthmatchingratio.Ingeneral,thefracturepropertiesoftheweldmetalaresuperiortothatofthefusionline forallkindsofP91weldedjointswithdifferentstrengthmatchingratio. Keywords:P91steel;weldedjoints;str