Abstract
A series of multilayer SUS304/Cr17 steels is successfully fabricated by roll bonding and subsequent annealing treatment. The results show that vacuum hot rolling can provide uniform layer thickness, a straight interface and strong metallurgical bonding, whereas cold-rolling deformation induces a laminate/network wave clad interface and weak bonding properties; this is attributed to the severe work-hardening behavior of the SUS304 layer and residual stress of the clad interface at the high cold-rolling reduction ratio, leading to a decrease of fracture elongation and interface bonding strength. Annealing treatment can effectively adjust the grain characteristics, texture distribution and alloying element diffusion behavior as well as dislocation plugging level. The grains change from a nanoscale laminate structure to an ultrafine fibrous structure and two-scale grain distribution with the increase of annealing temperature. Herein, high strength of 960 MPa and excellent fracture elongation of 28 pct can be obtained at the annealing temperature of 650 °C for 6 min. High-temperature annealing treatment can prompt the alloy element diffusion and relieve the residual stress of the cold-rolled clad interface. Moreover, bimodal grain distribution can be obtained by adjusting the annealing temperature, which is beneficial to strengthen and toughen multilayer steel.
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