Development Of Ferrous-Based Weldable Seismic Damping Alloy With Prolonged Plastic Fatigue Life

A new weldable Fe-Mn-Cr-Ni-Si seismic damping alloy with high fatigue resistance was developed by controlling phase transformation behaviour during both solidification and fatigue deformation. The so-lidification phase transformation was controlled by changing the Cr/Ni ratio to induce ferrite-austenite transformation and thus reduce the solidification cracking susceptibility. The Gibbs free energy difference between the austenite and epsilon-martensite was optimized to exhibit reversible transformation during fatigue deformation. The resultant alloy exhibited a prolonged fatigue life, and no solidification cracking was ob-served in a melt-run welding test. By using the newly developed alloy, a weld damper with excellent fatigue resistance can be fabricated. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.