Improvement of Bonding Strength of Horizontal Twin-Roll Cast Steel/Aluminum Clad Sheet by Electromagnetic Fields

doi:10.1007/s40195-017-0633-0

Abstract

Abstract:

Electromagnetic field is an available online method to increase bonding strength of clad sheet manufactured by horizontal twin-roll casting (HTRC). In this paper, an electric current pulse (ECP) and a complex field (static magnetic field (SMF) together with ECP) are exerted during HTRC of steel/aluminum clad sheet. The produced clad sheet has good appearance, and no visible defects exist at the bonding interface. The inter-diffusion zone at Fe/Al interface in ECP and SMF+ECP sheets is 3 and 4 μm, respectively, and the latter increases slightly compared with that in non-field sheet. The average peel strengths (APS) of ECP and SMF+ECP sheet are 14 and 21 N/mm, respectively, which increase by 2 and 9 N/mm compared with 12 N/mm of non-field sheet. The APS increment in SMF+ECP sheet is resulted from the increment of interface bonding spots and the enhancement of inter-diffusion zone width.

Key words: Clad sheet, Twin-roll casting, Electromagnetic field, Bonding strength

Gang Chen, Jin-Tao Li, Guang-Ming Xu. Improvement of Bonding Strength of Horizontal Twin-Roll Cast Steel/Aluminum Clad Sheet by Electromagnetic Fields[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(1): 55-62.

Figures/Tables 8

Fig. 1 Schematic diagram of TRC: a the device, b an enlarged image of cast-rolling zone, c directions of ECP and SMF. 1 and 5 cooling water; 2 lower roll; 3 and 15 electromagnetic coil; 4 clad sheet; 6 and 11 wire; 7 upper roll; 8 steel strip pinch roll; 9 steel strip; 10pulsed power supply; 12 aluminum melt; 13 sluice; 14 nozzle; 16 liquid zone; 17 liquid-solid coexisted zone; 18 solid zone

Table 1 Chemical compositions of stainless steel and AA1100 alloy (wt%)

Material	Fe	Cr	Si	Al	Ti	Mg	Ni
Stainless steel	86.292	11.874	1.145	0.21	0.13	0.128	0.126
AA1100	0.256	-	0.468	99.0	-	-	-

Fig. 2 Stable temperature field of roll during TRC for clad sheet, with casting speed of 1.25 m/min and pouring temperature of 700 °C: aupper roll; b lower roll

Fig. 3 a Non-field clad sheet, b ECP processed clad sheet, c SMF+ECP processed clad sheet

Fig. 4 Micro-topographies of steel/aluminum interface in a non-field [16], b ECP, c SMF+ECP clad sheets

Fig. 5 Contents of Fe and Al across the bonding interface in a non-field [16], b ECP, c SMF+ECP clad sheets

Fig. 6 Peel strength curves of the non-field, ECP and SMF+ECP clad sheets

Fig. 7 Aluminum surfaces of a non-field [16], b ECP, c SMF+ECP clad sheet after peeling, an enlarged picture of the boxes on the left sideshown on the right

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