Laser surface topography has great applications in mechanical, medical, and electrical industries. This paper proposes a mechanism for the shape formation of stainless steel by pulsed laser melting. A 2D axisymmetric finite element model considering the temperature-dependent surface tension is developed, in which the melt flow and free surface deformation are analyzed by using the normal and shear surface forces. The numerical results show that the molten flows toward the place of the greatest surface tension and the free surface deformation are dominated by the shear force (Marangoni effects), generated by the surface tension gradient during heating phase, and the normal stress, generated by the surface tension at the curved surface during the cooling period.
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Research-Article
Forming Mechanism of Bump Shape in Pulsed Laser Melting of Stainless Steel
Hong Shen,
Hong Shen
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical
System and Vibration,
Shanghai, 200240, China
e-mail: sh_0320@sjtu.edu.cn
System and Vibration,
Shanghai, 200240, China
e-mail: sh_0320@sjtu.edu.cn
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Yanqing Pan,
Yanqing Pan
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
Shanghai Jiao Tong University,
Shanghai 200240, China
Search for other works by this author on:
Jing Zhou,
Jing Zhou
College of Mechanical Engineering,
University of Shanghai for Science
and Technology,
Shanghai 200093, China
University of Shanghai for Science
and Technology,
Shanghai 200093, China
Search for other works by this author on:
Zhenqiang Yao
Zhenqiang Yao
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical
System and Vibration,
Shanghai, 200240, China
System and Vibration,
Shanghai, 200240, China
Search for other works by this author on:
Hong Shen
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical
System and Vibration,
Shanghai, 200240, China
e-mail: sh_0320@sjtu.edu.cn
System and Vibration,
Shanghai, 200240, China
e-mail: sh_0320@sjtu.edu.cn
Yanqing Pan
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
Shanghai Jiao Tong University,
Shanghai 200240, China
Jing Zhou
College of Mechanical Engineering,
University of Shanghai for Science
and Technology,
Shanghai 200093, China
University of Shanghai for Science
and Technology,
Shanghai 200093, China
Zhenqiang Yao
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical
System and Vibration,
Shanghai, 200240, China
System and Vibration,
Shanghai, 200240, China
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 23, 2016; final manuscript received December 19, 2016; published online February 28, 2017. Assoc. Editor: Milind A. Jog.
J. Heat Transfer. Jun 2017, 139(6): 062301 (10 pages)
Published Online: February 28, 2017
Article history
Received:
May 23, 2016
Revised:
December 19, 2016
Citation
Shen, H., Pan, Y., Zhou, J., and Yao, Z. (February 28, 2017). "Forming Mechanism of Bump Shape in Pulsed Laser Melting of Stainless Steel." ASME. J. Heat Transfer. June 2017; 139(6): 062301. https://doi.org/10.1115/1.4035710
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