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In order to study the evolution laws of microstructure and properties during the hot ring rolling, carburizing heat treatment, and deep cryogenic treatment of high-speed railway bearings, the quantitative relationships among the forming manufacturing conditions, microstructure states, and mechanical properties of high-speed railway bearings were established.The optimal process conditions for high-performance forming manufacturing of high-speed railway bearings were determined.The electron back-scatter diffraction (EBSD), scanning electron microscope (SEM), X-ray diffraction (XRD) microstructural testing technologies and tensile, friction and wear, rolling contact fatigue performance testing technologies were used to reveal the evolution laws of the microstructure and mechanical properties of high-speed railway bearing rings during the forming and manufacturing process, and a forming and manufacturing process method for high-performance high-speed railway bearing rings was proposed. The research shows that ring rolling can refine grains, promote the refinement of carbides and increase the dislocation density after carburizing once quenching and tempering, reduce the grain size and carbides, and improve the volume fraction of carbides after secondary quenching and tempering. The deep cryogenic treatment process promotes the decomposition of retained austenite and the precipitation of carbides, reduces the content of retained austenite, enhances the stability of retained austenite, decreases the average size of carbides, and increases the volume fraction of carbides. The wear resistance of high-speed railway bearings is improved by 82.7%, and the contact fatigue performance is improved by 322.1%by applying the optimal hot ring rolling and carburizing heat treatment processes. The research can provide a scientific basis and technical method for the high-performance forming manufacturing of high-speed railway bearings.
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为研究高铁轴承轧制成形、渗碳热处理、深冷处理组织性能遗传演化规律,建立了高铁轴承成形制造条件、组织状态、机械性能定量关系,确定了高铁轴承高性能成形制造最优工艺条件。采用电子背散射衍射(Electron Back-Scatter Diffraction,EBSD)、扫描电子显微镜(Scanning Electron Microscope,SEM)、X射线衍射(X-Ray Diffraction,XRD)等微观组织测试技术和拉伸、摩擦磨损、滚动接触疲劳性能测试技术,揭示了高铁轴承环件在成形制造过程中的组织状态和机械性能演化规律,提出了高性能高铁轴承环件成形制造工艺方法。研究表明,轧制成形可以细化晶粒,促使渗碳一次淬回火后碳化物细化和位错密度增加,减小二次淬回火后晶粒和碳化物尺寸,提升碳化物体积分数。深冷处理工艺促进残余奥氏体分解和碳化物析出,降低残余奥氏体含量,提升残余奥氏体稳定性,减小碳化物平均尺寸,提升碳化物体积分数。应用最优轧制成形和渗碳热处理工艺,使高铁轴承耐磨性能提升82.7%,接触疲劳性能提升322.1%。研究成果可为高铁轴承高性能成形制造提供科学依据和技术方法。
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1.State Key Laboratory of Super Alloys and Application Technology, Wuhan 430070, China
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1.高温轻合金及应用技术全国重点实验室,武汉 430070
2.现代汽车零部件技术湖北省重点实验室,武汉 430070
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华林,男,1962年生,湖北蕲春人,博士,教授;主要研究方向为节能与新能源汽车、运载装备、能源装备等高性能制造;E-mail:hualin@whut.edu.cn。
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华林,男,1962年生,湖北蕲春人,博士,教授;主要研究方向为节能与新能源汽车、运载装备、能源装备等高性能制造;E-mail:hualin@whut.edu.cn。
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2.现代汽车零部件技术湖北省重点实验室,武汉 430070
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拉伸、摩擦磨损和接触疲劳试验后样品, figureFileSmall=fo96R5a43UnA+oCeAkxq0Q==, figureFileBig=dDai/dzrEUJ/1uL3kmukFQ==, tableContent=null), ArticleFig(id=1241810810511622487, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.5, caption=
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轧制成形样品晶粒形貌, figureFileSmall=9q/XQbrPl3V3PlzxcYQpZg==, figureFileBig=N3r2vJtc/TUTzPyhmjONUQ==, tableContent=null), ArticleFig(id=1241810810775863653, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.6, caption=
Grain morphology of the specimens after hot ring rolling and carburizing heat treatment, figureFileSmall=WuVyH+hIwi1xkCs3XWXhQw==, figureFileBig=JQ3ZCysZ+s59xzLcctG1Tw==, tableContent=null), ArticleFig(id=1241810810868138347, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图6, caption=
轧制成形和渗碳热处理后样品晶粒形貌, figureFileSmall=WuVyH+hIwi1xkCs3XWXhQw==, figureFileBig=JQ3ZCysZ+s59xzLcctG1Tw==, tableContent=null), ArticleFig(id=1241810810972995956, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.7, caption=
SEM microstructure morphology of the specimens after hot ring rolling and carburizing once quenching and tempering, figureFileSmall=5oChy+dkIb9QcPej3IcxJw==, figureFileBig=c/rF6qLbtoFokdRGUE0tBQ==, tableContent=null), ArticleFig(id=1241810811061076346, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图7, caption=
轧制成形和渗碳一次淬回火后样品SEM微观组织形貌, figureFileSmall=5oChy+dkIb9QcPej3IcxJw==, figureFileBig=c/rF6qLbtoFokdRGUE0tBQ==, tableContent=null), ArticleFig(id=1241810811178516862, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.8, caption=
SEM microstructure morphology of the specimens at different secondary quenching temperatures (holding time is 60 min), figureFileSmall=npax6nsKmX+xZzE7tsM9vw==, figureFileBig=s8eHyPJLkBRJwUcOKhAODg==, tableContent=null), ArticleFig(id=1241810811279180165, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图8, caption=
不同二次淬火温度下样品SEM微观组织形貌(保温时间为60 min), figureFileSmall=npax6nsKmX+xZzE7tsM9vw==, figureFileBig=s8eHyPJLkBRJwUcOKhAODg==, tableContent=null), ArticleFig(id=1241810811384037770, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.9, caption=
SEM microstructure morphology of the specimens at different secondary quenching holding time (quenching temperature is 810 ℃), figureFileSmall=iVcXD/aYXFl8CDlbc+vj4A==, figureFileBig=3qPlyi3pG+1opWVao9uPxw==, tableContent=null), ArticleFig(id=1241810811472118157, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图9, caption=
不同二次淬火保温时间下样品SEM微观组织形貌(淬火温度为810 ℃), figureFileSmall=iVcXD/aYXFl8CDlbc+vj4A==, figureFileBig=3qPlyi3pG+1opWVao9uPxw==, tableContent=null), ArticleFig(id=1241810811568587157, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.10, caption=
Influence of secondary quenching temperature and holding time on the carbide average size and volume fraction, figureFileSmall=oJtyR5CBox6pmvqJowA8GA==, figureFileBig=1mQqerNfJqC+8OFtRazhzA==, tableContent=null), ArticleFig(id=1241810811686027675, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图10, caption=
二次淬火温度和保温时间对碳化物平均尺寸和体积分数的影响, figureFileSmall=oJtyR5CBox6pmvqJowA8GA==, figureFileBig=1mQqerNfJqC+8OFtRazhzA==, tableContent=null), ArticleFig(id=1241810811769913760, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.11, caption=
Influence of secondary quenching temperature and holding time on the diffraction intensity and content of retained austenite, figureFileSmall=RT47559qvKgb70aDU0zSeg==, figureFileBig=yRTObP4yMyDLVfFfXNSWTA==, tableContent=null), ArticleFig(id=1241810811891548586, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图11, caption=
二次淬火温度和保温时间对残余奥氏体衍射强度和含量影响, figureFileSmall=RT47559qvKgb70aDU0zSeg==, figureFileBig=yRTObP4yMyDLVfFfXNSWTA==, tableContent=null), ArticleFig(id=1241810811988017580, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.12, caption=
SEM microstructure morphology of the specimens under different deep cryogenic treatment processes, figureFileSmall=67ym48gZU6Ode+jgFvJBtg==, figureFileBig=11CSDJB7UGYAZxaE8Jj4Eg==, tableContent=null), ArticleFig(id=1241810812109652404, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图12, caption=
不同深冷处理工艺下样品SEM微观组织形貌, figureFileSmall=67ym48gZU6Ode+jgFvJBtg==, figureFileBig=11CSDJB7UGYAZxaE8Jj4Eg==, tableContent=null), ArticleFig(id=1241810812193538491, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.13, caption=
Influence of deep cryogenic treatment on the contents of carbides and retained austenite, figureFileSmall=lkgkm/XhralBmhuXgJ3Ztg==, figureFileBig=+iHJQ6HWU5ZwDEHGWwnRyA==, tableContent=null), ArticleFig(id=1241810812264841660, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图13, caption=
深冷处理对碳化物和残余奥氏体含量的影响, figureFileSmall=lkgkm/XhralBmhuXgJ3Ztg==, figureFileBig=+iHJQ6HWU5ZwDEHGWwnRyA==, tableContent=null), ArticleFig(id=1241810812365504959, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.14, caption=
Influence of secondary quenching process on microhardness and tensile strength, figureFileSmall=E571y/y+pTAPUBmcVQLL4w==, figureFileBig=GfmALbxNnj95nONWVl489w==, tableContent=null), ArticleFig(id=1241810812449391044, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图14, caption=
二次淬火工艺对显微硬度和抗拉强度的影响, figureFileSmall=E571y/y+pTAPUBmcVQLL4w==, figureFileBig=GfmALbxNnj95nONWVl489w==, tableContent=null), ArticleFig(id=1241810812554248650, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.15, caption=
Influence of deep cryogenic treatment process on microhardness and tensile strength, figureFileSmall=xzodXFDX8/43iNQRYtwaxw==, figureFileBig=pazgjMBBUQDb2xLMm4BA4A==, tableContent=null), ArticleFig(id=1241810812633940431, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图15, caption=
深冷处理工艺对显微硬度和抗拉强度的影响, figureFileSmall=xzodXFDX8/43iNQRYtwaxw==, figureFileBig=pazgjMBBUQDb2xLMm4BA4A==, tableContent=null), ArticleFig(id=1241810812730409428, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.16, caption=
Influence of hot ring rolling and carburizing heat treatment processes on wear resistance, figureFileSmall=eFEU5lVwNG6BsFsScksT1w==, figureFileBig=cwUGnZ7bhmPB02cMitlkzw==, tableContent=null), ArticleFig(id=1241810812856238553, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图16, caption=
轧制成形和渗碳热处理工艺对耐磨性能的影响, figureFileSmall=eFEU5lVwNG6BsFsScksT1w==, figureFileBig=cwUGnZ7bhmPB02cMitlkzw==, tableContent=null), ArticleFig(id=1241810812973679070, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.17, caption=
Surface morphology of sample wear marks, figureFileSmall=NCjSzY4hfVCafSVhEe0SZg==, figureFileBig=DnJYt/0wIB1HzJGeMpw26w==, tableContent=null), ArticleFig(id=1241810813099508192, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图17, caption=
样品磨痕表面形貌, figureFileSmall=NCjSzY4hfVCafSVhEe0SZg==, figureFileBig=DnJYt/0wIB1HzJGeMpw26w==, tableContent=null), ArticleFig(id=1241810813183394274, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.18, caption=
Relation between fatigue life and damage probability of the specimens, figureFileSmall=U+vC+rPwDbaxGamwZ+ZS6A==, figureFileBig=crdi2YSf08X+NScuHf/6Kw==, tableContent=null), ArticleFig(id=1241810813292446181, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图18, caption=
样品疲劳寿命和破坏概率之间的关系, figureFileSmall=U+vC+rPwDbaxGamwZ+ZS6A==, figureFileBig=crdi2YSf08X+NScuHf/6Kw==, tableContent=null), ArticleFig(id=1241810813393109480, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Fig.19, caption=
Relation of process parameters, microstructure and mechanical properties after hot ring rolling and carburizing heat treatment, figureFileSmall=V4ma2Fn3w593vsH2zZdOmQ==, figureFileBig=pYU2MfMl/xuKxyzND7TIQw==, tableContent=null), ArticleFig(id=1241810813476995563, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=图19, caption=
轧制成形和渗碳热处理工艺参数-组织状态-力学性能的关系, figureFileSmall=V4ma2Fn3w593vsH2zZdOmQ==, figureFileBig=pYU2MfMl/xuKxyzND7TIQw==, tableContent=null), ArticleFig(id=1241810813573464558, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Tab.1, caption=
Chemical composition of G20CrNi2MoA bearing steel
, figureFileSmall=null, figureFileBig=null, tableContent=
| C | Cr | Ni | Si | Mn | Fe |
|---|
| 0.22 | 0.54 | 1.77 | 0.35 | 0.64 | 余量 Balance |
), ArticleFig(id=1241810813686710771, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=表1, caption=
G20CrNi2MoA渗碳轴承钢化学成分
, figureFileSmall=null, figureFileBig=null, tableContent=
| C | Cr | Ni | Si | Mn | Fe |
|---|
| 0.22 | 0.54 | 1.77 | 0.35 | 0.64 | 余量 Balance |
), ArticleFig(id=1241810813762208246, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=EN, label=Tab.2, caption=
Process parameters of hot ring rolling and carburizing heat treatment
, figureFileSmall=null, figureFileBig=null, tableContent=
样品 Specimens | 壁厚减薄量 Ring rolling recdution/% | 渗碳热处理 Carburizing heat treatment |
|---|
| HR-0 | 0 | 热轧环坯 Hot ring blank |
| HR-45 | 45 | 热轧锻件 Hot rolled ring |
| RQT-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬回火 Hot ring blank+carburizing once quenching and tempering +secondary quenching and tempering |
| RQT-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬回火 Hot rolled ring+carburizing once quenching and tempering +secondary quenching and tempering |
| QDCT90-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-90 ℃/6 h)+回火(190 ℃/4 h) Hot ring blank+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-90 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT90-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-90 ℃/6 h)+回火(190 ℃/4 h) Hot rolled ring+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-90 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT196-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-196 ℃/6 h)+回火(190 ℃/4 h) Hot ring blank+carburizing once quenching and tempering+secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-196 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT196-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-196 ℃/6 h)+回火(190 ℃/4 h) Hot rolled ring+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-196 ℃/6 h)+tempering (190 ℃/4 h) |
), ArticleFig(id=1241810813837705721, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241686765719842971, language=CN, label=表2, caption=
轧制成形和渗碳热处理工艺参数
, figureFileSmall=null, figureFileBig=null, tableContent=
样品 Specimens | 壁厚减薄量 Ring rolling recdution/% | 渗碳热处理 Carburizing heat treatment |
|---|
| HR-0 | 0 | 热轧环坯 Hot ring blank |
| HR-45 | 45 | 热轧锻件 Hot rolled ring |
| RQT-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬回火 Hot ring blank+carburizing once quenching and tempering +secondary quenching and tempering |
| RQT-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬回火 Hot rolled ring+carburizing once quenching and tempering +secondary quenching and tempering |
| QDCT90-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-90 ℃/6 h)+回火(190 ℃/4 h) Hot ring blank+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-90 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT90-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-90 ℃/6 h)+回火(190 ℃/4 h) Hot rolled ring+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-90 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT196-0 | 0 | 热轧环坯+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-196 ℃/6 h)+回火(190 ℃/4 h) Hot ring blank+carburizing once quenching and tempering+secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-196 ℃/6 h)+tempering (190 ℃/4 h) |
| QDCT196-45 | 45 | 热轧锻件+渗碳一次淬回火+二次淬火(810 ℃/1 h)+深冷处理(-196 ℃/6 h)+回火(190 ℃/4 h) Hot rolled ring+carburizing once quenching and tempering +secondary quenching (810 ℃/1 h)+deep cryogenic treatment (-196 ℃/6 h)+tempering (190 ℃/4 h) |
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