Friction stir welding (FSW) was applied to a 10 mm-thick plate for the Fe-15Mn-10Cr-8Ni-4Si seismic damping alloy. A sound FSW joint obtained successfully without macro-defects such as groove-like defects and tunnel holes. However, small pores with diameters of 1–5 μm were formed owing wear tool during FSW. The decrease in heat input suppressed wear. Consequently, distribution limited border zo...

The extremely-low-cycle fatigue behavior and post-fatigue microstructure of an Fe–15Mn–10Cr–8Ni–4Si austenitic alloy were investigated under a strain rate maximum amplitude 0.5%/s 10%, respectively, in the axial direction. results can be summarized as follows. (1) A steel damper made withstand approximately 15 swings back even if structure is distorted by 10% due to large earthquake. (2) εpa–Nf...

In the current study, a broad experimental program was designed and conducted to investigate effect of aging conditions (i.e., temperature time) on thermomechanical properties (0.1% yield stress, pseudoelasticity, recovery stress) an FeMnSi-based shape memory alloy (FeMnSi-SMA) with chemical composition Fe–17Mn–5Si–10Cr–4Ni-1(V, C) (wt.%). addition, transmission electron microscopy (TEM) used s...