Microstructural evolution and solidification cracking susceptibility of grain boundary engineered fully austenitic stainless steel

Tokita, Shun; Kadoi, Kota; Kanno, Yudai; Inoue, Hiroshige

doi:10.1007/s40194-020-00865-8

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…5b). The weld is characterized by both cellular and locally dendritic-cellular structure, which is the reason for the change in ferrite-δ morphology, as also observed by, e.g., Tokita et al [41] and Hochanadel et al [42]. In the weld, the columnar crystal area is seen to be separated ( Fig.…”

Section: Examination Of Test Jointssupporting

confidence: 71%

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Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Janiczak

Pańcikiewicz

2021

Weld World

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The production of a ferrofluid container, intended for use in the KRAKsat (CubeSat type) satellite in space conditions, is presented. Mechanized laser beam welding for AISI 316L stainless steel test joint and container prototype was developed and tested. The welded test joints were examined by non-destructive visual, penetration and radiographic testing and destructive testing by macro- and microscopic examination, static tensile test, static bending test, and hardness measurements. The welded container prototype was examined by leak test, temperature-vacuum test and vibration test. Test joints’ evaluation showed a proper selection of welding parameters and expected quality of joints. Austenitic microstructure with small δ-ferrite content in base materials, heat-affected zones, and welds guarantees sufficient mechanical properties for this part geometry. The tensile strength range of test joints was 687–729 MPa, hardness range was 140–200 HV3, and the bending angle was 180°. Welding of the prototype container and testing of tightness, resistance to temperature changes, and vibration were successful. Compliance with flywheel design and manufacturing requirements will enable the launch of a research satellite into orbit with such a wheel.

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Section: Examination Of Test Jointssupporting

confidence: 71%

“…8). In the area of the fusion line, epitaxial growth is visible, consisting of crystallization of crystals from the previously laid layer with the same orientation as the previous bead, described, e.g., by Tokita et al [41] and Tuz [45]. The microstructures observed in the area of the second weld, shown in Fig.…”

Section: Examination Of Test Jointsmentioning

confidence: 54%

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Janiczak

Pańcikiewicz

2021

Weld World

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“…It is well known that in 310S stainless steel, the preferred growth direction for FCC crystals is 〈100〉 [16], and the crystals that have one of the six 〈100〉 directions oriented nearly parallel to the heat flow can grow rapidly. Thus, an increase in heat dissipation affects the growth direction of the dendrites.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat dissipation on solidification cracking behaviour of austenitic stainless steel during gas tungsten arc welding

Lee

Yamashita

Ogura

et al. 2021

Science and Technology of Welding and Joining

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During the U-type hot cracking test of gas tungsten arc welding (GTAW), the back side stainless steel was subjected to a continuous water flow (water-cooled GTAW) to prevent solidification cracking. The solidification cracking susceptibility was evaluated by electron backscatter diffraction and a finite element method. As the misorientation angle of the dendrite structure decreased due to the water-cooling process, the solid-liquid interface energy increased, making the liquation film unstable, and bridging occurred between the secondary dendrite arms. The increased heat dissipation resulted in the formation of highly ordered dendrites. Therefore, uniformity in the growth directions of columnar dendrites can be promoted. Furthermore, decreased critical coalescence undercooling reduced the residual liquation film stability and decreased stress concentration in the weld bead.

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“…The keyhole profile is calculated first using a point-by-point heat balance at the keyhole wall, which is defined by the boiling temperature of the alloy. The calculated keyhole profile and the heat flux were then integrated into a heat 1 IPG Photonics Corporation, Oxford, MA, USA 2 Carl Zeiss Microscopy GmbH, Jena, Germany 3 National Institute of Health, Bethesda, MD, USA 4 Thermo-Calc Software AB, Solna, Sweden transfer and fluid flow model to calculate the weld pool profile and corresponding thermal histories. In order to improve the accuracy and fidelity of these simulations, temperature-and composition-dependent thermophysical properties of the two nickel alloys used in these simulations were calculated using JMatPro ®5 for the reported compositions of each alloy and provided in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Integrated modeling of cracking during deep penetration laser welding of nickel alloys

Gao

Mondal

Palmer

et al. 2023

Science and Technology of Welding and Joining

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During deep penetration laser welding of nickel alloys, interactions between composition and processing conditions can lead to the formation of defects. Inconel 740H, for example, has demonstrated a susceptibility to horizontal fusion zone cracking at locations between 70% and 80% of the weld depth during laser welding at powers above 5 kW. Coupling three-dimensional heat transfer, fluid flow, and stress modeling tools allowed that both the strain rate and stress normal to the solidification direction to be calculated. In the Inconel 740H welds, cracks formed at locations where the strain rate and stress simultaneously reached critical levels. No cracking was observed in the Inconel 690 welds, since the strain rate and stress did not simultaneously reach these critical levels.

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Microstructural evolution and solidification cracking susceptibility of grain boundary engineered fully austenitic stainless steel

Cited by 9 publications

References 13 publications

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Effect of heat dissipation on solidification cracking behaviour of austenitic stainless steel during gas tungsten arc welding

Integrated modeling of cracking during deep penetration laser welding of nickel alloys

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