Microstructure and Properties of the 308LSi Austenitic Steel Produced by Plasma-MIG Deposition Welding with Layer-by-Layer Peening

Ol’shanskaya, T. V.; Трушников, Д. Н.; Dushina, A. Yu.; Ганеев, А. В.; Polyakov, A.; Semenova, Irina P.

doi:10.3390/met12010082

Cited by 6 publications

(1 citation statement)

References 19 publications

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“…In particular, there is no reliable information about the effect of heat treatment on the structure and mechanical properties of the resulting bimetal. The choice of this material system is associated with the wide use of ER70S-6 and ER309LSI alloys in mechanical engineering [61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Phase Composition, and Mechanical Properties of a Layered Bimetallic Composite ER70S-6-ER309LSI Obtained by the WAAM Method

Kabaldin

Shatagin

Ryabov

et al. 2023

Metals

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Currently, additive manufacturing technologies for materials and products are being implemented and improved. This is due to the possibility of creating workpieces with complex geometric shapes and specified functional gradient properties. The materials with the most complex functional properties demanded by the military–energy industry include bimetals of the “low-alloyed carbon steel—stainless chromium-nickel steel” type. One of the promising ways to obtain bimetallic products is the WAAM (Wire Arc Additive Manufacturing) technology. Despite the large scientific groundwork, the composition, structure, and properties of bimetallic composites produced by WAAM have not been sufficiently studied. The aim of the current work is to study the effect of WAAM parameters and the subsequent heat treatment on the composition, structure, and physical and mechanical properties of the bimetallic composite “ER70S-6-R309LSI”. Spectral, metallographic, and X-ray diffraction studies were carried out, as were mechanical tests of the samples obtained under various WAAM modes. In order to improve the composites’ properties, various types of heat treatments were applied. It is shown that the WAAM modes, the building strategy, and heat treatment determine the structure of layers and transition zones, as well as the mechanical characteristics of the composite. The structure of ER70S-6 in the composite is represented by the ferrite and the ferrite–cementite mixture (pearlite), and ER309LSI is represented by different ratios of austenite, δ-ferrite, carbide, and intermetallic phases. From the point of view of the mechanical properties, the most promising mode of surfacing is “Double Pulse”, followed by heat treatment by way of austenitization and normalization annealing. In this case, there is a decrease in the content of the δ-ferrite, a leveling of microhardness values, and a 40% increase in the tensile strength of the composite.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Phase Composition, and Mechanical Properties of a Layered Bimetallic Composite ER70S-6-ER309LSI Obtained by the WAAM Method

Kabaldin

Shatagin

Ryabov

et al. 2023

Metals

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Structure, Mechanical Properties and Features of Crack Growth Micromechanism of Maraging Steel Obtained by Hybrid Additive CMT Surfacing

Simonov,

Trushnikov,

Shchitsyn

et al. 2024

Met Sci Heat Treat

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CMT-WAAM deposition strategies for thin overhanging disc of SS308LSi and investigation of mechanical and microstructural characteristics

Koppu,

Lautre,

Motwani

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work investigates the deposition strategies with microstructural evolution and mechanical properties of SS308LSi overhanging disc produced by CMT-WAAM in horizontal position. The disc was deposited on a rotating cylindrical substrate where three primary geometrical abnormalities named sagging, start and end defect and humping were observed. The causes and remedial strategies were investigated to eliminate these abnormalities. Microstructure analysis of the layers cross section revealed a defect free layer depositions and columnar solidification with epitaxial grain growth. A very slightly coarser grains structure is observed in the middle layers of the disc compared to that of bottom and top regions. The microhardness at bottom, mid and top regions are in the range of 236 ± 9.2 HV, 227 ± 11.3 HV and 232 ± 6 HV, respectively. The microhardness values are consistent with the calculated SDAS along the build direction. Tensile tests were performed at room temperature and the samples failed with an average yield strength, ultimate tensile strength, and percentage of elongation of 391.4 ± 21 MPa, 616.8 ± 19.5 MPa and 45.6 ± 0.8% respectively. This work reveals that CMT-WAAM can successfully produce overhanging disc components of high-quality without using an industrial robot at a relatively low cost.

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Microstructure and Properties of the 308LSi Austenitic Steel Produced by Plasma-MIG Deposition Welding with Layer-by-Layer Peening

Cited by 6 publications

References 19 publications

Microstructure, Phase Composition, and Mechanical Properties of a Layered Bimetallic Composite ER70S-6-ER309LSI Obtained by the WAAM Method

Microstructure, Phase Composition, and Mechanical Properties of a Layered Bimetallic Composite ER70S-6-ER309LSI Obtained by the WAAM Method

Structure, Mechanical Properties and Features of Crack Growth Micromechanism of Maraging Steel Obtained by Hybrid Additive CMT Surfacing

CMT-WAAM deposition strategies for thin overhanging disc of SS308LSi and investigation of mechanical and microstructural characteristics

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