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Experimental characterization and fatigue behavior of thermally and mechanically treated 316L stainless steel MIG-welded joints

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Abstract

The improvement and optimization of post-weld treatments in the case of austenitic 316L stainless steels are, to a large extent, a condition of the service life of the associated structures. In this regard, mechanical brushing and heat treatment are post-weld techniques dedicated to the assembly of mechanically welded structures applicable in the aeronautics, food, and transport sectors. In this study, two techniques are applied to welded joints: mechanical brushing and heat treatment at high temperature. The base material is austenitic stainless steel with molybdenum (AISI316L) in sheet of 5-mm thick. The adopted welding process is Arc Welding under Metal Inert Gas (MIG). Monotonic Tensile test, micro-hardness measurement, low cycle fatigue, micro-hardness measurement, and MES (scanning electron microscopy) observation were conducted in order to qualify the welded, brushed, and heat-treated weldment. Compared with the welded and brushed samples, the treatment with heat annealing specimen maintains the longest lifetime and the lowest consolidation stress ± 0.4% imposed strain rate and 10−3/s as displacement speed. The annealing heat treatment has a softening effect on the welded structure during the test of the cycle fatigue; this is consistent with the micro-hardness levels measured in the weldment.

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Authors and Affiliations

  1. Laboratory of Applied Mechanics and Engineering (LR-MAI): National School of Engineers of Tunis, University of Tunis El Manar, Tunis, Tunisia

    Hichem Guizani

  2. ISET, University Campus of Boulifa, Kef, Tunisia

    Hichem Guizani & Brahim Tlili

  3. Applied Mechanics and Systems Research Laboratory, Tunisia Polytechnic School, University of Carthage, Tunis, Tunisia

    Moez Chafra

Authors
  1. Hichem Guizani
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  2. Brahim Tlili
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  3. Moez Chafra
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Correspondence to Hichem Guizani.

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Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Guizani, H., Tlili, B. & Chafra, M. Experimental characterization and fatigue behavior of thermally and mechanically treated 316L stainless steel MIG-welded joints. Weld World 65, 67–78 (2021). https://doi.org/10.1007/s40194-020-00997-x

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  • DOI: https://doi.org/10.1007/s40194-020-00997-x

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