Effects of Quenching on Microstructure and Properties of Cu-Pb-Sn/Fe Bimetals
In order to achieve a high-strength combination of copper/steel bimetals and avoid problems such as inter-face cracking and copper layer detachment,the traditional solid-liquid composite casting was combined with the quenching process to investigate the effect of quenching on microstructure and mechanical properties of the copper/steel bimetallic interface.The results indicate that the quenching process accelerates the cooling rate,and the α-Cu phase dendrites are refined.With the quenching temperature of 800℃,Pb particles are refined and uniformly distributed with the decrease of grain size on the copper side of fine grain region,increasing the grain boundaries of the α-Cu,where the inter-diffusion distance of copper/steel bimetallic atomic is increased to 11.95 μm,and the shear strength reaches the highest value of 247.2 MPa,obtaining desirable mechanical properties.
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