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ID:44590006
大小:721.89 KB
页数:16页
时间:2019-10-23
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1、摘要1Abstract11引言12实验方法及条件22.1实验条件22.2激光熔覆过程与工艺参数22.3测试方法33实验结果分析及讨论43.1电磁搅拌使熔池内温度和成份趋向均匀53.2电磁搅拌对熔覆层内气孔的影响73.3电磁搅拌对熔覆层裂纹的影响73.4电磁搅拌对熔覆层组织显微硬度的影响94结束语10参考文献10硬度的影响及机理研究姓名:吴玉娥学号:20065040090单位:物理电子工程学院专业:物理学指导教师:余本海职称:副教授组织的影响。实验与理论分析均表明,电磁搅拌能够使激光熔覆层的组织晶粒细化、分布更均匀,并能够消除熔覆层内的
2、气孔和裂缝,提高熔覆层质量。此外还研究了不同强度的电磁搅拌对熔覆层显微硬度的影响,结果表明,随着电磁搅拌强度的增加,激光熔覆层显微硬度相应提高。关键词:激光熔覆;电磁搅拌;显微组织;裂纹;显微硬度StudiesoftheEffects&mechanismofelectromagneticstirringonthemicrostructuresandhardnessoflasercladdingWC-CobasedalloycoatingAbstract:Effectsoflasercladdingwithelectromagnetic
3、stirringonthemicrostructuresofthelasercladdinglayerswerestudied.Bothexperimentalandtheoreticalanalysesindicatethatthemicrostructuresofthelasercladdinglayerswithelectromagneticstirringweremuchfinerandmoreuniformthanthosewithoutelectromagneticstirring.Highqualitativelayer
4、s,freeofporosityandcrackswereobtainedfromthelasercladdingwithelectromagneticstirring.Theinfluencesoflasercladdingwithdeferentelectromagneticstirringstrengthonthehardnessofthelasercladdinglayershavealsobeeninvestigated.Theresultsshowthatthehardnessincreasedwiththeincreas
5、eofelectromagneticstirringstrength.Keywords:lasercladding;electromagneticstirring;microstructure;cracks;hardness1引言激光熔覆是用于零件表面强化的一种激光表面改性技术,它能通过对熔覆粉末(金属、合金及陶瓷粉末)设计,显著改善基材表面的耐磨、耐蚀和抗氧化性能,在石油化工、航空航天、汽车、机械等行业具有广阔的应用前景⑴役组织的影响。实验与理论分析均表明,电磁搅拌能够使激光熔覆层的组织晶粒细化、分布更均匀,并能够消除熔覆层内的气孔
6、和裂缝,提高熔覆层质量。此外还研究了不同强度的电磁搅拌对熔覆层显微硬度的影响,结果表明,随着电磁搅拌强度的增加,激光熔覆层显微硬度相应提高。关键词:激光熔覆;电磁搅拌;显微组织;裂纹;显微硬度StudiesoftheEffects&mechanismofelectromagneticstirringonthemicrostructuresandhardnessoflasercladdingWC-CobasedalloycoatingAbstract:Effectsoflasercladdingwithelectromagneticst
7、irringonthemicrostructuresofthelasercladdinglayerswerestudied.Bothexperimentalandtheoreticalanalysesindicatethatthemicrostructuresofthelasercladdinglayerswithelectromagneticstirringweremuchfinerandmoreuniformthanthosewithoutelectromagneticstirring.Highqualitativelayers,
8、freeofporosityandcrackswereobtainedfromthelasercladdingwithelectromagneticstirring.Theinfluencesoflasercladdin
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