驱动辊转速对铸态42CrMo钢环件热辗轧微观组织的影响规律.pdf

《驱动辊转速对铸态42CrMo钢环件热辗轧微观组织的影响规律.pdf》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、20l2NO．3重型机械·59·驱动辊转速对铸态42CrMo钢环件热辗轧微观组织的影响规律郭良刚，潘霞，杨合，李永堂，谷瑞杰(1．西北工业大学凝固技术国家重点实验室，陕西西安710072；2．太原科技大学材料科学与工程学院，山西太原030024；3．中国重型机械研究院有限公司，陕西西安710032)摘要：环形铸坯微观组织的演变规律及合理控制是环类零件铸辗复合成形新技术发展面临的主要瓶颈问题。驱动辊转速是影响铸坯材料再结晶行为及组织状态的关键因素之一。本文基于ABAQUS平台，建立了42CrMo铸坯环件热辗轧的宏微观有限元模型，模拟揭示了环形铸坯材料的动态再结晶行为，阐明了驱动辊转速对再结晶晶

2、粒尺寸及其分布的影响规律与机制。结果表明：铸坯材料动态再结晶百分数在环件内、外层高而使晶粒细化，而在环件中间层低导致粗晶；驱动辊转速增大，铸坯材料动态再结晶百分数增加，轧制环件的平均晶粒尺寸减小；驱动辊转速对平均晶粒尺寸分布的均匀性影响不大。关键词：环件铸辗复合成形；铸态材料；动态再结晶；晶粒尺寸；驱动辊转速；有限元模拟中图分类号：TF124文献标识码：A文章编号：100l一196X(2012J03—0059—06Efectsofrotationalspeedofdrivingrollonmicrostructureevolutionduringhotringrollingofas-cast

3、42CrMosteelGUOLiang．gang，PANXia，YANGHe’，LIYong．tang，GURui．jie(1．StateKeyLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity，Xi’an71(X)72，China；2．SchoolofMaterialsScienceandEngineering，TaiyuanUniversityofScienceandTechnology，Taiyuan030024，China；3．ChinaNationalHeavyMachineryResea

4、rchInstituteCo．，Ltd，Xi’an710032，China)Abstract：Theevolutionrulesandreasonableregulationofthemicrostructureoftheas—castringblankmaterialisthemainbottleneckquestionforthedevelopmentofthenewcasting—rollingcompositeformingtechnology．Therotationalspeedofthemainrollisoneofthekeyfactorsinfluencingthereery

5、stallizationbehaviorandmi—crostruetureoftheas—castringblankmateria1．Inthispaper，wefirstestablishedacoupledmacro—microFEmodelofhotringrollingforas—cast42CrMosteelunderABAQUSsoftwareenvironment，thennumericallyre—vealeddynamicrecrystallization(DRX)behaviorofas—castringblankmaterial，andlastlyclarifiedt

6、heeffectrulesandmechanismoftherotationalspeedofthemainrollongrainsizeanditsdistribution．Theresultsshowthat：(1)TheDRXpercentagesishighintheinnerandouterlayersoftheringleadingtorefinedgrainwhilerelativelylowinthemiddlelayeroftheringresultingincoarsegrain；(2)theDRXpercentageincreaseswhiletheaveragegra

7、insizedecreaseswiththeincreaseoftherotationalspeedofthenlainroll；and(3)therotationspeedofthemainrollhasnegligibleeffectontheuniformityofthedistributionoftheaveragegrainsize，Keywords：casting—rollingcomposite