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Research Papers

Laser Repair With Addition of Nano-WC on Microstructure and Fracture Behavior of 304 Stainless Steel

[+] Author and Article Information
Wei Jiang

School of Mechanical Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mail: jiangwei@dlut.edu.cn

Xianfeng Jiang

School of Mechanical Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mail: xianfengjiang2016@hotmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received July 22, 2016; final manuscript received March 22, 2017; published online May 16, 2017. Assoc. Editor: Ashraf Bastawros.

J. Eng. Mater. Technol 139(4), 041002 (May 16, 2017) (9 pages) Paper No: MATS-16-1207; doi: 10.1115/1.4036586 History: Received July 22, 2016; Revised March 22, 2017

Precracked 304 stainless steel (304SS) compact tension (CT) specimens repaired by laser with addition of different weight fractions of nano-tungsten carbide (nano-WC) were studied to investigate the effects of nano-WC on the fracture behavior and microstructure. Crack open displacements (CODs) measured by a digital image correlation (DIC) system were compared among specimens with different treatments. Microstructures were examined by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS). The results indicate an overall improvement of microstructure and fracture behavior. The specimen repaired by the addition of 5% nano-WC shows the most significant improvement from the current study. Both metallurgical bonding at the interface and fine equiaxial grains in the repaired layer are observed. The densification process of the repaired layer is also improved. In addition, an approximately 10–30% reduction of COD values was observed as the applied load varied from 1 to 20 kN. However, excessive addition of nano-WC led to the agglomeration and inhomogeneous distribution of WC nanoparticles in the repaired layers, resulting in the formation of microcracks. The fracture parameter COD shows a close relationship with the microstructure in laser repaired specimens with different powder ratio addition.

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Figures

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Fig. 1

The dimensions of the CT specimen

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Fig. 2

The images of two powders: (a) nano-WC and (b) 304SS powder

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Fig. 3

CT test device: 1—computer, 2—lighting source, 3—loading system, and 4—CCD camera

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Fig. 4

The COD of the specimens repaired by different methods under different loads

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Fig. 5

The cross section of the specimen: (a) repaired by laser only and (b) repaired by laser with powder addition

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Fig. 6

COD of specimens without repair and repaired by laser with different weight fractions of nano-WC

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Fig. 7

SEM microstructure of the cross section of the crack tip in the specimen without repair and SEM microstructure of cross sections of repaired layer in the specimens repaired with different nano-WC contents: (a) no repair, (b) 0%, (c) 5%, (d) 10%, (e) 20%, (f) 30%, and (g) 40%

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Fig. 8

SEM microstructure of the whole cross sections of specimens repaired with various weight fractions of nano-WC particles: (a) 5%, (b) 10%, (c) 20%, (d) 30%, and (e) 40%

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Fig. 9

SEM microstructures at the interface of specimens repaired by laser with various weight fractions of nano-WC particles: (a) 5%, (b) 10%, (c) 20%, (d) 30%, and (e) 40%

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Fig. 10

The bound interface of the specimens repaired with excessive nano-WC additives: (a) 30% and (b) 40%

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Fig. 11

The line-scanning element distribution in the specimen treated by laser repair with the addition of 40% nano-WC particles

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