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Effect of Flash Allowance on Microstructure and Properties of Flash Butt Welded Joint for 510 MPa Wheel Steel |
Hongbo ZHANG1,Fengliang TAN2,3,Zhiguo CHEN1,2() |
1 School of Materials Science and Engineering, Central South University, Changsha 410083, China 2 Department of Mechanical and Electrical Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China 3 Postdoctoral workstation of VALIN LY Steel Co.Ltd, Loudi 417000, China |
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Cite this article:
Hongbo ZHANG,Fengliang TAN,Zhiguo CHEN. Effect of Flash Allowance on Microstructure and Properties of Flash Butt Welded Joint for 510 MPa Wheel Steel. Chinese Journal of Materials Research, 2017, 31(2): 152-160.
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Abstract The effect of different flash allowances on the microstructure and mechanical properties of flash butt welded joint for 510CL wheel steel was investigated. The results indicate that the heat affected zone consists of interfacial zone, coarse grain zone, annealed zone and incomplete annealed zone. The Vickers hardness of interface area is the highest, and the peak hardness range is 201 ~ 219 HV. When flash allowance is lower, interface area mainly consists of blocky ferrite and granular bainite. When flash allowance is moderate, the interface area consists of acicular ferrite with excellent mechanical performance. Excessive flash allowance generates too much heat, and the interface area will mainly consist of widmanstatten structure and granular bainite with poor mechanical properties. The welded joint fracture may be ascribed to the existence of too much widmentstatten structure with high density of mismatch. In order to obtain flash butt joint with good performance, the reasonable range design of flash allowance is 3.5 ~ 5.5 mm.
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Received: 06 July 2016
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Fund: Supported by Natural Science Foundation of Hunan Province (No.2016JJ6045) |
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