Composition Design And Property Study Of Fe-Cr-Mo Cast Damping Alloys

The development of modern science and technology improve the power and running speed of mechanical equipment, it brings a serious vibration and noise problems at the same time.When the traditional noise and vibration reduction measures do not meet the needs of the situation, try to use the damping alloy to solve the problem. Fe-Cr-Mo series damping alloys are widely studied as ferromagnetic type damping alloy, which performances excellent. But these studies mainly focused on deforming alloy. The Chemical Composition Design of cast alloy is based on the mechanism of Ferromagnetic-type alloy. In the ternary Fe-16Cr-2.5Mo alloy, by adding Mn,Si to improve fluidity, adding Ni to improve the corrosion resistance, adding Nb for grain refinement. Meanwhile, study the effects of chemical composition on the mechanical properties and damping capacity.The mechanical properties of cast ternary Fe-16Cr-2.5Mo alloy is Rm=340MPa, the damping property tanΦmax=0.021.Mn, Si alloy elements have a greater effect on the alloy plasticity. By optimizing addition amount of Mn, Si, Ultimately determining the appropriate addition amount is 0.3%,0.5%. Mechanical properties Rm=405MPa, A=26.5%. Compared with Fe-16Cr-2.5Mo ternary alloy casting samples, the mechanical properties increased significantly, the damping value decreased 12%, but the damping capacity still close to ternary deforming alloy. So, take the above-mentioned ingredients as the basic component of casting alloys.Study of Ni,Nb alloying elements effecting on the properties of casting alloys and ultimately determining the Ni, Nb addition amount is 0.8%,0.1%.Alloy strength increase in A certain degree, but the plasticity decreases.The damping capacity of this alloy increases and the strain region which showed high damping expands with addition of Ni.Besides,adding Nb improves the damping properties of high-strain zone.In this topic, the low strain zone of damping-strain curve accord well with S-B theoretical model. The platform appears in the high strain zone,it is because of that the movement of magnetic domain wall was hindered by dislocation and magnetic domain structure change at high strain zone. By observing the magnetic domain,we found that the morphology of Magnetic domain was very different.It is the reason that different damping alloy own different damping capacity.