Powered by OpenAIRE graph
Found an issue? Give us feedback

Numerical modeling of the stress-strain state during additive MIG welding with CuSi3Mn silicon bronze

Numerical modeling of the stress-strain state during additive MIG welding with CuSi3Mn silicon bronze

Abstract

The article analyzes in detail the stress-strain state during additive manufacturing using silicon bronze CuSi3Mn1 (БрКМц3-1), which is widely used in the machine-building industry for the manufacture of bushings, spring parts, and parts of chemical apparatus. The high cost of non-ferrous copper-based alloys makes it important to use Welding Arc Additive Manufacturing (WAAM) technologies. The processes of layer-by-layer surfacing of silicon bronzes lead to residual stresses at the tensile strength of the material, which can eventually provoke the development of critical defects in the form of cracks. Based on the simultaneous solution of the finite element method for the equations of heat balance and mechanics of a solid deformed body, the peculiarities of temperature distribution and parameters of the stress-strain state for the developed model of a triangular equilateral prism, which is additively generated from CuSi3Mn1 bronze, are determined. Verification of the experimental model with the calculated one was carried out by comparing the thermal cycles of surfacing. Based on the analysis of the results of numerical modeling, it was found that the nature of the temperature change and the magnitude of its decrease in the corresponding layer after the deposition of subsequent layers are the same and do not depend on the deposition trajectory, and the largest residual equivalent plastic deformations are formed in the first layer with a gradual decrease in the value in each subsequent deposited layer, which is associated with a decrease in the degree of volume of the VAT prism from the 1st to the 10th layer. The lower layers are characterized by a volumetric stress state due to the presence of rigid binders in the form of the substrate and the upper welded layers, which increases the probability of cracking in these layers during the cooling stage due to a decrease in the material's strength below σB < 170 MPa in the temperature range of 475-550 °C.

Досліджено напружено-деформований стан адитивно згенерованих виробів із застосуванням кремнієвої бронзи CuSi3Mn1 (БрКМц3-1). Розроблена скінченно-елементна модель, на базі якої виконане числове моделювання пошарового наплавлення просторового виробу. Досліджено зміни температурного поля та виявлено, що характер зміни температур і величина її зменшення у відповідному шарі після наплавлення наступних шарів є однаковими і не залежать від траєкторії наплавлення. Встановлено, що для нижніх (1-4 шар) та верхніх (останніх) шарів характерний об’ємний напружений стан, який призводить до утворення тріщин на стадії охолодження в діапазоні температур 475–550 оС при зменшенні межі міцності наплавленого матеріалу σВ<170 МПа.

Keywords

WAAM; GMAW; напружено-деформований стан; адитивні технології; CuSi3Mn1; пошарове наплавлення, WAAM; GMAW; stress-strain state; additive technologies; CuSi3Mn1; layer-by-layer surfacing

  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold