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A brace-type seismic damper made of an Fe-15Mn-11Cr-7.5Ni-4Si alloy solidified in the ferrite-austenite (FA) mode and SN490B steel, which can be constructed via welding, was proposed. To realize the proposed seismic damper, gas metal arc welding was applied to produce similar FMS/FMS fillet welds and dissimilar FMS/SN490B fillet weld joints. Based on the Schaeffler diagram, similar and dissimilar welding consumables were designed such that the fillet weld metal solidified in the FA mode without solidification cracking. Sound similar fillet welded joints were obtained using two types of welding consumables with different Cr/Ni equivalent ratios although both the similar fillet weld metals had a coarse columnar austenite grain structure. These displayed higher tensile strengths (716–736 MPa) and marginally lower elongations (67–70%) than the FMS alloy. Moreover, a similar fillet weld metal with a chemical composition almost identical to that of the FMS alloy exhibited a remarkable low-cycle fatigue life (5740 cycles). This was shorter than that of the FMS alloy (9351 cycles) owing to the easier formation of α’-martensite. A dissimilar fillet welded joint with a chemical composition within the austenite region was produced without solidification cracking. The dissimilar fillet weld metal showed high tensile strength (867 MPa) and total elongation (61%). These were comparable to those of similar fillet weld metals.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Gas metal arc welding, seismic damping alloy, fillet weld metal

刊行年月日: 2024-09-15

出版者: Iron and Steel Institute of Japan

掲載誌:

• ISIJ International (ISSN: 09151559) vol. 64 issue. 11 ISIJINT-2024-174

研究助成金:

• JST JPMJTR203B (A-STEP産学共同(本格型))

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2355/isijinternational.isijint-2024-174

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更新時刻: 2024-09-25 16:30:41 +0900

MDRでの公開時刻: 2024-09-25 16:30:41 +0900