| METALS AND METAL MATRIX COMPOSITES |
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| Microstructure Characteristics in the Pulsed Laser Welding Joint of Zr-based BMG and 304L Stainless Steel |
| CHEN Huizi1, HUANG Jiankang1,2, LIU Shi’en2, YU Xiaoquan2, FAN Ding2
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1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050, China |
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Abstract Using pulsed laser welding method, the connection between Zr44Ti11Ni10Cu10Be25 (at%) bulk metallic glass and 304L stainless steel plate was realized. The microstructures and chemical compositions of different regions of weld joint were characterized by field emission scanning electron microscope, energy dispersive spectrometer and X-ray diffraction. Three different crystallization zones were formed due to different coo-ling rates. The weld joint consists of partial crystallization zone (heat affected zone, weld zone and 304L stainless steel/weld zone interface) and amorphous zone (Zr-based bulk metallic glass base metal). Petal-like and small-particle crystallization occurs in heat affected zone. The intensity of diffraction peaks in X-ray diffraction pattern is very small. Some cross-snowflake crystallization appear in weld zone. The diffraction peaks correspond to Zr2Cu and Zr2Fe phases. A large number of sharp crystal peaks appear in XRD pattern at 304L stainless steel/weld zone interface. The results show that the crystallization fractions of heat affected zone, weld zone and 304L stainless steel/weld zone interface are 1.4%, 10.0% and 27.4%, respectively. The Vickers hardness of the crystalline microstructure formed in the weld zone is the highest. The diffusion layer formed between BMG and weld zone indicates that Zr migrates to weld zone through diffusion layer during welding.
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Published: 24 July 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51865029). |
About author:: Huizi Chenwas born in 1994 in Weifang, Shandong Province. She received M. S. degree from Lanzhou University of Technology in 2020 under the supervision of Prof. Jiankang Huang. Her research interest is amorphous alloy welding interface mechanism and dissimilar metal connection.
Jiankang Huang, associate professor, master supervisor in Lanzhou University of Technology. He received B. S. degree in Xiangtan University, received M. S. degree from Lanzhou University of Technology in 2007 and received his Ph. D. in Lanzhou University of Technology in 2010. His research interests are dissimilar metal connection, welding physics and welding process detection & control, and he has about 100 publications. |
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2020, Vol. 34 
