Microstructure and fractural morphology of cobalt-based alloy laser cladding

Chen Hao; Pan Chun-xu

doi:10.1007/BF02838452

Journal of Wuhan University of Technology Materials Science Edition ›› 2003, Vol. 18 ›› Issue (3) : 30 -32. DOI: 10.1007/BF02838452

Article

Microstructure and fractural morphology of cobalt-based alloy laser cladding

Chen Hao ¹^,²
, Pan Chun-xu ³

Author information +

History +

PDF

Abstract

The solidification features, micro-segregation, and fracture characteristics of cobalt-based alloy on the substrate of 20 CrMo steel by laser cladding were studied by using electron microscopy. Experimental results show that the fine columnar grains and cellular dendrite grains are obtained which are perpendicular to the coating/substrate interface; the primary arms are straight while the side branches are degenerated; the microstructure consists of primary face-centered cubic (fcc) Co dendrites and a network of Cr-enriched eutectic M23 C6 (M=Cr, W, Fe) carbides; the micro-segregation is severe for the rapid heating and cooling of laser cladding; the typical brittle intergranular fracture occurs in cobalt-based laser cladding layer.

Keywords

laser cladding / Cobalt-based alloy / solidification microstructure / micro-segregation / fracture

Cite this article

Download citation ▾

Chen Hao, Pan Chun-xu. Microstructure and fractural morphology of cobalt-based alloy laser cladding. Journal of Wuhan University of Technology Materials Science Edition, 2003, 18(3): 30-32 DOI:10.1007/BF02838452

登录浏览全文

4963

注册一个新账户忘记密码

References

Publishing order | Descend order by publishing year | Descend order by cited within

[1]	Jiang W H, Yao X D, Guan H R, Hu Z Q. Secondary Carbide Precipitation in a Directionally Solidified Cobalt-base Superalloy. Metall. Mater. Trans., 1999, 30A: 513-520.

[2]	Chu Shuangjie, Li Jianguo, Liu Zhongyuan, . On Morphologies, Microsegregation, and Mechanical Behavior of Directionally Solidified Cobalt-base Superalloy at Medium Cooling Rate. Metall. Mater. Trans. A, 1994, 25A: 637-642.

[3]	Vilar R. Laser Alloying and Laser Cladding. Materials Science Forum, 1999, 301: 229-252.

[4]	Corchia M, Delogu P, Nenci F, . Microstructural Aspects of Wear-resistant Stellite and Colmonoy Coatings by Laser Processing. Wear, 1987, 119: 137-152.

[5]	Frenk A, Kurz W. Microstructural Effects on the Sliding Wear Resistance of a Cobalt-based Alloy. Wear, 1994, 174: 81-91.

[6]	Frenk A, . Influence of an Intermediate Layer on the Residual Stress Field in a Laser Clad. Surface and Coatings Technology, 1991, 45: 435-441.

[7]	Pilloz M, Pelletier J M, Vannes A B. Residual Stresses Induced by Laser Coatings: Phenomenological Analysis and Predictions. Mater. Sci, 1992, 27: 1240-1244.

[8]

Pan C, Yang S. Vitek J M, David S A, Johnson J A, Smart H B, Debroy T. Fractographic Character of the Dissimilar Steel Weldments. Proceedings of the 5th International Conference on International Trends in Welding Research. Pin Mountain, Georgia, 1–5 June 1998, 1999, Materials Park, Ohio: ASM International. 876-879.

[9]	Yaohe Zhou, Zhuangqi Hu, Wanqi Qiao. Solidifying Technology, 1998, Beijing: Machinery Industry Press. 34-34. (in Chinese)

[10]	Hamar-thibault S, Durand-charre M, Andries B. Carbide Transformations during Aging of Wear-resistant Cobalt alloys. Metall. Trans. A, 1982, 13A: 545-550.