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本科毕业论文（设计）论文题目GCr15轴承钢电脉冲球化退火热处理工艺参数的优化GCR15BEARINGSTEELBALLOFELECTRICALPULSEPARAMETERSOFANNEALINGHEATTREATMENTPROCESSOPTIMIZATION学生姓名所在院系所学专业机械设计制造及其自动化导师姓名完成时间2GCr15轴承钢电脉冲球化退火热处理工艺参数的优化摘要GCrl5钢是工业生产中广泛使用的一种滚动轴承钢钢，为提高轴承钢的使用寿命，改善组织性能，一直是工作者关注的问题。而锻扎状态的GCrl5滚动轴承钢原始组织中碳化物的形态，尺寸和分布，对轴承钢使用寿命的提高至关重要。在工业生产中一般通过传统普通等温球化退火处理工艺，使GCrl5滚动轴承钢组织中碳化物以细小颗粒状、弥散分布在基体中。但传统的普通等温球化退火工艺，由于加热温度高、保温时间长既13h左右或工艺复杂，使等温球化退火工艺过程的效率显著下降。因此我们寻找了一种加快碳化物球化速度，提高等温球化退火工艺效率的新方法，探讨了一种在脉冲电场作用下对GCrl5滚动轴承钢球化退火的新工艺。关键词正交试验法，电脉冲处理，GCr15钢，球化退火3GCR15BEARINGSTEELBALLOFELECTRICALPULSEPARAMETERSOFANNEALINGHEATTREATMENTPROCESSOPTIMIZATIONAbstractGCrl5steeliswidelyusedinindustrialproductioninasteelrollingbearingsteel,bearingsteeltoimprovetheservicelifeandimproveorganizationalperformance,hasbeenaconcernoftheworkers.ThestatebarGCrl5Forgedsteelrollingbearingcarbideoriginalformoforganization,sizeanddistribution,toincreasetheservicelifeofbearingsteelisessential.Industrialproductioningeneralthroughtraditionalordinaryspheroidizingisothermalprocess,sothatrollingbearingsteelGCrl5organizationstosmallgranularcarbide,dispersedinthematrix.However,thetraditionalballofordinaryisothermalannealingprocess,duetothehighheatingtemperature,holdingtimelongerbotharound13horthecomplextechnology,sothattheballoftheisothermalannealingprocessefficiencydecreasedsignificantly.Therefore,wefindakindofspeedinguptherateofcarbideballandimproveballisothermalannealingprocessandtheefficiencyofthenewmethods,discussestheroleofapulsedelectricfieldofrollingbearingsteelballGCrl5underthenewprocessofannealing.KeywordsOrthogonaltest,Electropulsing,GCr15steel,Spheroidizingannealing4目录1绪论......................................................12试验准备..................................................12.1试验仪器及介绍................................................12.1.1制作高温箱式电阻炉的炉门..................................22.2实验目的......................................................23试验原理..................................................23.1退火工艺......................................................23.2球化退火......................................................33.3电脉冲原理....................................................33.4实验材料......................................................43.5试验过程......................................................44实验方案..................................................64.1正交实验数据表................................................64.2正交实验设计步骤..............................................74.3测洛氏硬度（HRC）并转换为布氏硬度............................85正交实验结果及分析..........................................95.1方差分析法....................................................95.2最佳水平.....................................................145.2.1各因素水平效应............................................145.2.2最佳水平的选取...........................................156金相显微试样的制备.........................................156.1侵蚀.........................................................156.2金相试样制备.................................................167结论.....................................................16致谢.......................................................18主要参考文献与资料..........................................19
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