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页数:7页
时间:2019-02-03
《低氧特殊钢中大尺寸ds类夹杂物生成机理》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、低氧特殊钢中大尺寸DS类夹杂物生成机理姜敏,王昆鹏,侯泽旺,王新华北京科技大学冶金与生态工程学院,北京100083通信作者,E-mail:jiangmin@ustb.edu.cn摘要为了探讨低氧特殊钢中大尺寸DS类夹杂物的生成机理,通过ASPEXPSEMexplorer自动扫描电镜对比分析国内外低氧特殊钢试样中夹杂物特征(国内、外试样各两个),发现国内试样中夹杂物平均尺寸大于国外试样,夹杂物的最大尺寸则数倍于国外试样:国内试样中夹杂物的最大尺寸分别为24.9和13.1μm,国外试样分别为7.6和7.5μm.对比国内外特钢试样中大尺寸与小尺寸夹杂物可发现二
2、者成分基本相同,推断大尺寸DS类夹杂物可能是细小夹杂物碰撞长大而形成.通过分析大尺寸夹杂物的可能来源,在实验室通过高温共聚焦激光扫描显微镜观察夹杂物在钢中固/液相界面处的行为.结果发-6现,总氧降低至7×10时,尺寸5μm以下的微细夹杂物可被固/液相界面所捕捉,并在固/液相界面处发生碰撞、聚集、长大而生成大尺寸(>12μm)DS类夹杂物.关键词特殊钢;夹杂物;尺寸;生成机理分类号TF764FormationmechanismofoversizedDS-typeinclusionsinlowoxygenspecialsteelJIANGMin,WANGKun
3、-peng,HOUZe-wang,WANGXin-huaSchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,ChinaCorrespondingauthor,E-mail:jiangmin@ustb.edu.cnABSTRACTToinvestigatethegenerationmechanismofoversizedDS-typeinclusionsinlowoxygenspecialsteel,acompa
4、rativeanalysisofinclusionswasperformedonoverseasanddomesticspecialsteelsamplesbytheautomaticsecondaryelectronmicroscopyASPEXPSEMexplorer.Boththeaveragesizeandmaximumsizeofinclusionsarelargerindomesticsamplesthanoverseassamples.Particularly,themaximumsizeofinclusionsindomesticsample
5、sisseveraltimesthatinoverseassteelsamples:24.9and13.1μmindomesticsamplesand7.6and7.5μminoverseassamples,respectively.Basedonthechemicalcompositionanalysisofinclusionsindomesticsamples,itisfoundthattheoversizedinclusionsandsmallerinclusionshavesimilarcompositions.Therefore,thedetect
6、edDS-typeinclusionsareendogenousbutnotexogenous,whichcanbeproducedbycollisionsamonginclusionparticles.TofurtherstudythepossibleoriginsoftheoversizedDS-typeinclusions,in-situobservationonthebehaviorsofinclusionsatthesolid/liquidinterfaceinlowoxygenspecialsteelshowthattinyinclusionsl
7、essthan5μmcanbeeasilyandstablycapturedbythesolid/liquidinterfacewith-6atotaloxygencontentof7×10.Moreover,collisions,agglomeration/coalescenceandgrowthofinclusionscapturedbythesolid/liquidinterfaceresultintheformationofmuchlargersizeDS-typeinclusionsover12μm.KEYWORDSspecialsteel;inc
8、lusions;size;formationmech
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