旋转辊压法诱导低碳钢表面纳米化

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1、摘要通过旋转辊压塑性变形方法，在10#钢表面形成了纳米结构表层。用x射线衍射、扫描电子显微镜和透射电子显微镜对表层变形层的组织结构进行系统分析。利用显微硬度试验机来测量表面显微硬度。结果表明，具有体心立方晶体结构的10#钢经过旋转滚压塑性变形后，在表面可以形成具有一定厚度的纳米晶体组织，表面层的晶粒尺寸大约为20rim，变形层厚度大约8009m，表面显微硬度大约为600HV，比原始退火态提高了约3倍。对旋转辊压表面纳米化处理后10#钢的低温退火行为进行了研究。发现退火温度影响了表层的显微硬度分布。随着退火温度的增高，显微硬度先增加，在573K温度下

2、退火，硬度值达到最高(约增加8％)，随后降低。对比研究了旋转滚压塑性变形前后样品进行离子注入氮的行为。发现在相同离子注入工艺处理后，经过表面纳米化处理后样品的表面含氮量高于退火态样品，注入深度大约为600rim，而未经表面纳米化样品的注入深度大约只有几个纳米。关键词：表面纳米化，显微组织，强烈塑性变形，显微硬度，离子注入．I．AbstractBymeanofcirculationrollingplasticdeformation(CRPD)，ananostructuredsurfacelayerwasformedona10#steel．Themic

3、rostructurefeaturesweresystematicallycharacterizedbyusingX．raydiffraction(XRD)analysis，scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM)observations．Microhardnessonthesurfacelayerweremeasuredbymierohardnesstestingmachine．Theresultsshowthatthenanostructureds

4、urfacelayerswereobtainedona10#steelwithbccstructure，thegrainsizeonthenanocrystallinesurfacewasabout20nrn，thedepthofdeformedlayerwas800gm，thesurfacemicrohardnesswas600HVwhichwas3timesofthatoftheinitialsample．ThelowtemperatureannealingbehaviorofthesampleaftertheCRPDtreatmentwasi

5、nvestigated．Itwasfoundthatvariationofannealingtemperatureaffluencesthedistributionofhardnessonthesurfacelayer．Themicrohardnessfirstincreases，whichreacheshighestvaluesat573Kfincreases8％thantheinitialsample)，thendeceaseswithannealingtemperatureincreasing．Ionimplantationbehavioro

6、fthesampleafterCRPDtreatmentwasinvestigatedincomparisonwiththatintheoriginsample．ItwasfoundthatthenitrogencontentonthesurfacelayerofthesamplesubjectedtoCRPDtreatmentishigherthanthatinoriginsamplewiththesanleion．Ⅱ．implantingtreatmentparameter．Afterionimplantation，implantingdep协

7、oftheCRPDsamplewasabout600nm，whilewhichoftheoriginsamplewasafewnm，mainlyduetofastatomicdiffusionchannelsofgrainboundariesofnanoscalemicrostructureintroducedbycirculationrollingplasticdeformation．Keywords：Surfacenanocrystallization；Microstructure；Severeplasticdeformation；Microh

8、ardness；Ionplantation．．III．．y’624．S88声明本学位论文是我在导师的指导下取得的研究成果，