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1、1Mo-0．25V耐热钢焊接热影响区热模拟试验研究第28卷第1期2007年2月材料热处理TRANSACTIONSOFMATERIALSANDHEAT田砸^_TMENTVo1.28No.1February20072.25Cr.1M0.0.25V耐热钢焊接热影响区热模拟试验研究付瑞东,逯允海,杨永强,张文辉(1.亚稳材料制备技术与科学国家重点实验室,燕山大学材料科学与工程学院,河北秦皇岛066004;2.中国第一重型机械(集团)公司,黑龙江齐齐哈尔141062)'摘要:采用G1eeble.3500热模拟
2、试验机和工业模拟热处理炉对2.25Cr-1Mo.0.25V钢进行了焊接热循环和焊后热处理试验,并对其组织和一30~C冲击韧性进行了分析和测试.结果表明:经一次和二次焊接热循环试样的组织均发生粗化,其中一次热循环产生的粗大组织在二次热循环中得到继承,上述组织特点导致该钢焊后热影响区低温冲击韧性恶化.经700℃焊后热处理后低温韧性得到显着提高,且随回火时间的延长韧性进一步提高.断I:1由处理前的准解理断裂转为韧窝为主的韧性断裂特征.一次和二次焊接热循环后,析出相粒子的形状变得很不规则,且在二次循环后有部
3、分小粒子出现,这可能与焊接快速加热及循环后的冷却过程有关.经焊后热处理后,粒子形貌变的规则并发生粗化.关键词:低合金高强钢;热影响区;焊接热循环;低温韧性;焊后热处理;析出相粒子卫中图分类号:TG441.8;TGI13文献标识码:A文章编号:1009.6264(2007)01—0066-06Thermalsimulationexperimen~ofweldingheataffectedzoneof2.25C卜1M0.O.25VheatresistancesteelFURui—dong',LUYun—
4、hai,YANGYong-qiang.,ZHANGWen—hui(1.KeylaboratoryofMetastableMaterialsScienceandTechnology,CollegeofMaterialsScienceandEngineeringYanshanUniversity,QinhuangdaoO66OO4,China;2.ChinaFirstHeavyIndustryLtd,Qiqihaer141062,China)Abstract:Theexperimentsofweldin
5、gthermalcycleandpost—weldingheat—treatment(PWHT)werecarriedoutfor2.25Cr-1Mo-0.25VsteelbymeansofGleeble-3500thermalsimulatorandsimulationheat—treatmentfurnace.Themicrostructureoftheweldingheataffectedzonewasanalyzedanditsimpactpropertiesweremeasured.The
6、resultsshowthatthemicrostructureexhibitscoarsefeatureafteroneandtwicethermalcycle,andthecoarsemicrostructurcformedinthefirstthermalcycleisinheritedduringthesecondthermalcycle.Theabovemicrostructureresultsinthedecreasingofthecryogenictoughness.Thecryoge
7、nictoughnessisincreasedbythePWHTatthetemperatureof700℃.andwithincreasingthemmpefi~timethecryogenictoughnessisincreased.Thefracturemodechangesfromquasi—cleavagetoductilefracturewithdimplesbeforeandafterPWHT.Themorphologyoftheprecipitatedphaseparticlesbe
8、comeirregularshapeafteroneandtwiceweldingthermalcycle.Afewofsmallerparticlesarealsofoundaftertwiceweldingthermalcycleanditmayberelatedtothequicklyheatingandsubsequentcoolingduringweldingthermalcycle.Themorphologyoftheparticlesbecomeregu
