Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Yang, Xuan; Yang, Jin; Liu, Hongbing; Deng, Jingyu; Wang, Yuhua

doi:10.1080/13621718.2020.1830545

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…Of particular significance, the representative FSW weld, specimen s2, exhibits an admirably lesser weight loss of 0.420831 %, a distinctive marker of high corrosion resistance. corrosion behaviour is governed by an array of factors encompassing temperature, corrosive agent concentration, diffusion rates, and the presence of oxidising agents [19]. these determinants collectively dictate a material's susceptibility to corrosion processes.…”

Section: Resultsmentioning

confidence: 99%

Microhardness and corrosion properties of friction stir welded phosphor bronze

Gopi,

Mohan

2024

The Paton Welding J.

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this study investigates the microhardness and corrosion properties of friction stir welded (fsw) joints in phosphor bronze (cusn 4 ), a vital non-ferrous alloy in engineering applications. the research delves into the fsw process, employing varying welding parameters to create joints that exhibit distinct microstructural characteristics. Microhardness distribution across the fsw joints is assessed and correlated with the base material's properties. corrosion behaviour is rigorously examined through weight loss tests, revealing insights into the susceptibility of FSW joints to various corrosive environments. The study identifies the influence of FSW parameters on microhardness and corrosion performance, thus contributing to understanding the alloy's behaviour under this welding technique. this research shows that the welding speed of 0.25 mm/s, tool rotational speed of 1100 rpm, plunger depth of 0.2 mm, and a hexagonal tool profile produce the better joint with the highest microhardness of 139 HV and rate of corrosion of 0.420831 %.

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Section: Resultsmentioning

confidence: 99%

Microhardness and corrosion properties of friction stir welded phosphor bronze

Gopi,

Mohan

2024

The Paton Welding J.

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“…The nickel content is one of the main factors affecting the CTE of Invar alloys [ 2 ]. The main reason that the CTE of the weld did not mismatch that of the BM, was related to the preservation of the Ni content in the FZ [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, K-TIG welding was used for welding of Invar 36 alloy [ 22 ]. However, the change in morphology, microstructure and mechanical properties of the weld joints obtained with different welding parameters was not comprehensively discussed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Input on Weld Microstructure and Properties in Keyhole TIG Welding of Invar 36 Alloy

Liu

Yang

et al. 2023

Materials

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The Invar alloy is widely used for aircraft wing mould manufacturing. In this work, keyhole-tungsten inert gas (K-TIG) butt welding was used to join 10 mm thick Invar 36 alloy plates. The effect of heat input on the microstructure, morphology and mechanical properties was studied by using scanning electron microscopy, high energy synchrotron X-ray diffraction, microhardness mapping, tensile and impact testing. It was shown that regardless of the selected heat input, the material was solely composed of austenite, although the grain size changed significantly. The change in heat input also led to texture changes in the fusion zone, as qualitatively determined with synchrotron radiation. With increases in heat input, the impact properties of the welded joints decreased. The coefficient of thermal expansion of the joints was measured, which demonstrated that the current process is suitable for aerospace applications.

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“…FeNi36, called Invar in the industry, is an iron-based nickel alloy containing 64% iron (Fe) and 36% nickel (Ni) alloys (Wegener et al , 2021). Invar 36 has a very low thermal expansion coefficient, thanks to the 36% Ni element in its content (Xuan et al , 2020). The 35%–45% Ni concentration of this material causes it to exhibit very low thermal expansion ( α 25∼100°C ∼1.6 × 10-6°C) and thus provides high rigidity in the place of use (Acharya et al , 2021; Yao et al , 2022).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

Ceritbinmez,

Kanca,

Tuna

et al. 2023

AEAT

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Purpose FeNi36 (Invar-36) alloy is widely used in the fabrication of molding tools in aerospace industries but there remains a need to improve its wear and friction performance due to its relatively low hardness. The formation of a heat affected zone (HAZ) on the surface of Invar-36 cut by wire electric discharge machining (WEDM) is promising to enhance its tribological properties. This study aims to investigate the tribological performance of WEDM-treated Invar-36 via a ball-on-disk tribometer in dry-sliding conditions. Design/methodology/approach The untreated and WEDM-treated Invar-36 surfaces were reciprocated against an alumina ball at a sliding velocity of 40 mm/s, a stroke length of 10 mm and a sliding duration of 125 min under loads of 5, 10 and 20 N. The worn surfaces were characterized using a 2D profilometry and a scanning electron microscope equipped with energy-dispersive spectroscopy. Findings The results showed that the WEDM-treated surface had a superior friction coefficient and wear resistance in comparison to the untreated surface, due to the grown HAZ. There was found to be a 9.3%–11.4% decrease in the friction coefficient and a 47%–57% reduction in the wear volume after the WEDM treatment. Both the untreated and WEDM-treated Invar-36 surfaces found abrasion and plastic deformation as the dominant wear mechanisms. Originality/value Previous works have not focused on the tribological performance of the WEDM-treated Invar-36 extensively used for molding tools in aerospace industries. Our findings provide compelling evidence that the WEDM treatment improved the wear and friction performance of Invar-36 alloy because of the grown HAZ.

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Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Cited by 11 publications

References 18 publications

Microhardness and corrosion properties of friction stir welded phosphor bronze

Microhardness and corrosion properties of friction stir welded phosphor bronze

Effects of Heat Input on Weld Microstructure and Properties in Keyhole TIG Welding of Invar 36 Alloy

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

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