[1]李明喜,何宜柱,孙国雄.Co基合金激光熔覆层组织及近表面结晶方向[J].东南大学学报(自然科学版),2002,32(6):932-935.[doi:10.3969/j.issn.1001-0505.2002.06.024]
 Li Mingxi,He Yizhu,Sun Guoxiong.Microstructure and crystallization direction of laser cladding Co-based alloy[J].Journal of Southeast University (Natural Science Edition),2002,32(6):932-935.[doi:10.3969/j.issn.1001-0505.2002.06.024]
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Co基合金激光熔覆层组织及近表面结晶方向()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
32
期数:
2002年第6期
页码:
932-935
栏目:
材料科学与工程
出版日期:
2002-11-20

文章信息/Info

Title:
Microstructure and crystallization direction of laser cladding Co-based alloy
作者:
李明喜12 何宜柱2 孙国雄1
1 东南大学机械工程系, 南京 210096; 2 安徽工业大学激光加工中心, 马鞍 243000
Author(s):
Li Mingxi12 He Yizhu2 Sun Guoxiong1
1 Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
2 Laser Processing Center, Anhui University of Technology, Maanshan 243002, China
关键词:
激光熔覆 Co基合金 共晶 枝晶
Keywords:
laser cladding Co-based alloy eutectic dendrite
分类号:
TG174.44
DOI:
10.3969/j.issn.1001-0505.2002.06.024
摘要:
采用同步送粉式激光熔覆工艺在45#钢表面制备了Stellite Co基合金涂层.利用光学显微镜、扫描电镜(SEM)、附件(EDS)及X射线衍射仪分析了熔覆层的快速凝固微观组织特征和相结构.熔覆层初生相为γ-Co枝晶,枝晶间为γ-Co及Cr23C6共晶组成.在熔覆层的近自由表面,发现了一种新的、结晶方向与激光扫描速度方向平行的细小枝晶.熔覆层与基体界面为平面结晶,向中心过渡为胞状晶、柱状枝晶等多种形态.两道熔覆层的搭接区组织粗化,且出现准等轴晶、等轴晶.
Abstract:
Stellite Co-based alloy coatings deposited by laser cladding using synchronous feeder on 45# steel are introduced. Sections of such coatings were examined to reveal their microstructure and phase composition using optical microscope, scanning electron microscope(SEM), accessory(EDS)and X-ray diffractometer(XRD). The results show that the prime phase(γ-Co)dendrite and(γ-Co+Cr23C6)eutectic exist in the coatings. A novel microstructure paralleling to scan velocity direction was observed near the top surface. There exist some other crystallization morphologies in different zones, such as planar, cellar(at the interface), columnar and dendrite(at the center area). Equiaxed or quasi-equiaxed crystallization was also observed in the bonding zone between two tracks where the microstructure coarsened.

参考文献/References:

[1] Zhang Song,Zhang Chunhua,Man Hauchung,et al.Wear resistance and hot corrosion behavior of laser cladding Co-based alloy[J]. Trans Nonferrous Met Soc China,2001,11(6):838-842.
[2] Shepeleva,Medres B,Kaplan W D,et al.Laser cladding of turbine blades[J].Surface and Coatings Technology,2000(125):45-48.
[3] Hisamoto Fujimagari,Makoto Hagiwara,Toshio Kojima.Laser cladding technology to small diameter pipes[J].Nuclear Engineering and Design,2000(195):289-298.
[4] Gaumann M,Henry S,Cleton F,et al.Epitaxial laser forming:analysis of microstructure formation[J].Materials Science and Engineering, 1999(271):232-241.
[5] Kurz W,Bezencon C,Gaumann M.Columnar to equiaxed in solidification processing[J]. Science and Technology of Advanced Materials,2001(2):185-191.
[6] Guo W,Kar A.Interfacial instability and microstructural growth due to rapid solidification in laser processing[J].Acta mater,1998,46(10):3485-3490.
[7] Boettinger W J,Coriell S R,Greer A L,et al.Solidification microstructures:recent developments,future directions[J].Acta mater,2000(48):43-70.
[8] Kwok C T,Cheng F T,Man H C.Laser surface modification of UNS 31603 stainless steel.part Ⅱ:cavitation erosion characteristics[J].Materials Science and Engineering,2000(290):74-88.
[9] 尚丽娟,才庆魁,刘常升,等.用稀土改性钴基合金激光熔覆层[J].稀有金属,2002,26(3):173-178.
  Shang Lijuan,Cai Qingkui,Liu Changsheng,et al.Effect of RE doping on properties of Co-based alloy coating treated by laser cladding[J].Chinese Journal of Rare Metals,2002,26(3):173-178.
[10] 张文钺.焊接冶金学[M].北京:机械工业出版社,1997.116-127.

备注/Memo

备注/Memo:
基金项目: 中韩政府间国际合作资助项目(2002009)、安徽省科技厅中美国际合作资助项目(01088013).
作者简介: 李明喜(1966—),男,博士生,anmxl@yahoo.com.cn; 孙国雄(联系人),男,教授,博士生导师,gxsun@seu.edu.cn.
更新日期/Last Update: 2002-11-20