JournalofUniversityofScienceandTechnologyBeijing
摘要经过包覆浇铸+热轧变形工艺,制备了Q235/CrWMn钢复合刀具资料,并用扫描电子显微镜(SEM)和维氏硬度仪分
析了复合资料的界面安排、成分和功能的改变规则.试验依据成果得出,经过真空锻炼浇铸以及变形量超越90%的热轧工艺,能够
完成两种组元金属资料之间的冶金结合,其间Cr、W等元素的过渡层宽度仅为10~40μm.随后的热处理研讨之后发现,复合资料
在830±5℃保温后空冷或许油淬时,Q235一侧为珠光体+铁素体安排,CrWMn一侧为马氏体安排,其硬度可达600~750HV,
PreparationofQ235/CrWMncuttingtoolmaterialbycompositecastingandhot
XIEGuoliang,LIUJing,HANJingtao,HANXiaoGuang
SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China
ABSTRACTAcompositecuttingtoolmaterial,consistingofQ235andCrWMnsteel,waspreparedbycompositecastingandhot
rollingprocess.Throughvacuummeltingandcasting,followedbyhotrollingdeformationwitharelativereductionlargerthan90%,ex
cellentmetallurgicalbondingbetweenthecomponentmaterialswasobtained,withaninterfacelayerofonly10to40μmwide.Heat
treatmentexperimentswithdifferentcoolingmodeswerecarriedout.Theresultsshowedthatafteraircoolingoroilquenching,amix
turemicrostructureofferriteandpearliteinQ235wasformed.WhileinthesideofCrWMn,amartensitestructurewithamicrohard
nessof600to750HVwasfound.Thecompositematerialexhibitstheexcellentcomprehensivemechanicalpropertiesofbothhigh
KEYWORDScompositematerials;cuttingtoolmaterials;compositecasting;interface
作者简介:解国良(1985—),男,博士研讨生;韩静涛(1957—),男,教授,博士,Email:hanjt@mater.ustb.edu.cn
Table1ChemicalcompositionofQ235AandCrWMnsteel%
CrWMn090~105015~035080~110090~120120~160≤0030≤0030
Fig.1Schematicdiagram of Q235A/ CrWMn composite casting
10 mm × 10 mm × 5 mm 的样品, 置于 20% NaCl +
Table 2 Pass reduction of hot rolling process for Q235A/ CrWMn com
图2 轧制后 Q235A/ CrWMn 复合资料的安排改变( 左边为 Q235 钢,右侧为 CrWMn) . ( a) 复合板厚度为10 mm;( b) 复合板厚度为5 mm
Fig. 2 Microstructure evolution of Q235A/ CrWMn composite materials during hot rolling process ( the left side is Q235 steel, and the right side is
CrWMn steel) : ( a) slab thickness of 10 mm; ( b) slab thickness of 5 mm
图3 轧制后复合资料界面邻近合金元素的散布( 左边为 Q235 钢,右侧为 CrWMn) . ( a) W 元素的 EDS 能谱; ( b) Cr 元素的 EDS 能谱
Fig. 3 Alloying element distribution along the interface ( the left side is Q235 steel and the right is CrWMn steel) : ( a) EDS linear scanning map of
W; ( b) EDS linear scanning map of Cr
第 3 期 解国良等: 包覆浇铸和热轧工艺制备 Q235 / CrWMn 刀具资料
Table 3 Cooling rate of different cooling modes
图4 不同方法冷却后的 Q235A/ CrWMn 复合资料显微安排 SEM 相片. ( a) 空冷; ( b) 油淬; ( c) 水淬
Fig. 4 SEM micrographs of Q235A/ CrWMn composite materials under different cooling modes: ( a) air cooling; ( b) oil quenching; ( c) water
Fig. 5 SEM micrograph of Q235A after oil quenching ( the left side
Table 4 The concentration of ferrite and pearlite in Q235 after oil
Fig. 6 Hardness distribution along the interface of Q235A/ CrWMn
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