山东建筑大学毕业论文本科毕业论文题目：表面多重旋转碾压处理对45钢组织和性能的影响院（部）：材料科学与工程学院专业：材料成型及控制工程山东建筑大学毕业论文PAGEIV摘要本文详细阐述了利用表面多重旋转碾压设备处理45钢实验板材，使其表面晶粒达到纳米级别的详细过程。论文探讨了在相同转速、压强，不同加工时间下表面多重旋转碾压实验对材料表面晶粒细化的影响程度，并用金相显微镜、显微维氏硬度仪、X射线衍射仪等分析检验试样组织和性能的改变。在相同的转速1800r/min和相同的压强0.4Mpa的条件下，随加工时间的增加，45钢实验板材表面晶粒细化程度逐渐增强，通过金相组织的观测，当达到最长加工时间60min时，板材表面晶粒细化程度达到最大化。此时，表面多重旋转碾压使试样的表层显微硬度明显增加，表层的显微硬度较未加工板提高了约74.1%，达到343.8HV，经X射线衍射检测和计算测得表面的平均晶粒尺寸约为37.5nm，达到了表面纳米化的目的。实验结果表明：通过表面多重碾压加工处理，45钢可以实现表面纳米化。关键词：表面多重旋转碾压；45钢；表面纳米化；平均晶粒尺寸；显微硬度ABSTRACTThistextintroducedtomakeuseofsurfacetoweightorevolveNiantopressanequipmentsprocessingtotrykindmoreandmadecrystalgrainofitssurfaceattainaNariceClassofdetailedprocess.Thethesisinquiredintointhehomologyandturnsoon,thedissimilarityprocesstimeunderthesurfaceweighandrevolveNianandpresssolidandcheckmoreacrystalgraintheinfluencedegreethatisthinandturnistothematerialsurfaceandcounteractagoldmutuallymicroscope,showminutedetailstheWeisurnamedegreeofhardnessinstrumentandXandshootlineYanandshootaninstrumentetc.analysistheexaminationtrythechangeofkindfunction.Besoonsamealiketurninga1800rs|underminandtheconditionofpressingofhomologystrong0.4Mpas,withprocesshoraryincrement,45steelstestaplankmaterialsurfacethecrystalgrainisthintoturndegreegradualstrengthen,beattaintogrowthe60minsofprocessingtimemost,plankmaterialsurfacethecrystalgrainBethintoturndegreetoattaintomaximize.Atthistime,surfaceofontheaveragecrystalgrainsizeaboutisa24.6nms,cometoasurfaceNathericeturnsofpurpose.ThesurfaceNariceturnstomakethesurfacelayeroftryingthekindshowminutedetailsdegreeofhardnessobviousincrement.BEturningsoonforthe1800rs|min,pressstrongisa0.4MPas,theshowingminutedetailsofsurfacelayerdegreeofhardnessmorehasneverprocessedplanktoraiseabout74.1%whileprocessingtimeas60minsandattained343.8HVs.Testresultenunciation:PresstoprocessaprocessingthroughmultipleNiansofsurfaces,45steelscancarryoutsurfaceNaricetoturn.Keywords:ThesurfaceweighstorevolveNiantopressmore;45steels;ThesurfaceNarice