Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Waqas, Ali; Qin, Xin; Xiong, Jiangtao; Chen, Zheng; Wang, Hongbo

doi:10.3390/met9111208

Cited by 20 publications

(7 citation statements)

References 32 publications

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“…Also, the volume fraction of the precipitated cementite phase in the form of lamellar pearlites is not detectable. Other researchers have reported a similar trend (Rafieazad et al, 2019), (Waqas et al, 2019). Frontiers in Mechanical Engineering frontiersin.org…”

Section: Phase Analysissupporting

confidence: 70%

Influence of active cooling on microstructure and mechanical properties of wire arc additively manufactured mild steel

et al. 2023

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Additive manufacturing (AM) of metals attracts attention because it can produce complex structures in a single step without part-specific tooling. Wire arc additive manufacturing (WAAM), a welding-based method that deposits metal layer by layer, is gaining popularity due to its low cost of operation, feasibility for large-scale part fabrication, and ease of operation. This article presents the fabrication of cylindricalshaped mild steel (ER70S-6) samples with a gas metal arc (MIG)—based hybrid WAAM system. A mechanism for actively cooling the substrate is implemented. Deposition parameters are held constant to evaluate the impact of active cooling on deposition quality, inter-pass cooling time, and internal defects. Surface and volume defects can be seen on the cylindrical sample fabricated without an active cooling setup. Defect quantification and phase analysis are performed. The primary phase formed was α-iron in all samples. Actively cooled deposition cross section showed a 99% decrease of incomplete fusion or porosity, with temperature measured 60 s after deposition averaging 235°C less than non-cooled. Microstructural analysis revealed uniformity along the build direction for actively cooled deposition but non-uniform microstructures without cooling. Hardness decreased by approximately 22HV from the first layer to the final layer in all cases. Property variation can be attributed to the respective processing strategies. The current study has demonstrated that active cooling can reduce production time and porosity while maintaining uniform microstructure along the build direction. Such an approach is expected to enhance the reliability of WAAM-processed parts in the coming days.

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Section: Phase Analysissupporting

confidence: 70%

Influence of active cooling on microstructure and mechanical properties of wire arc additively manufactured mild steel

et al. 2023

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“…The fracture appearance is rough, fibrous and torn. They are characteristics of appearance of a ductile fracture [14] i.e. appearance of yielding and plastic deformation.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Beliardouh¹,

Tlili²,

Oulabbas³

et al. 2021

Tribol. Ind.

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This work aimed to study the microstructure, wear and corrosion resistance of supermartensitic stainless steel (SMSS). Heat treatment applied to samples consists of quenching after austenitization at elevated temperature (1250 °C) followed by a double tempering at 650 °C. Conventional mechanical properties, scanning electron microscopy (SEM/EDS) analysis and X-ray diffraction methods (XRD) are used to analyze the microstructure and to evaluate the wear mechanisms. The potentiodynamic polarisation and the electrochemical impedance spectroscoopy (EIS) methods are used to evaluate the corrosion resistance in both the 0.5M H2SO4 and 0.5M NaCl aggressive media. The microstructure is mainly composed with tempered lath martensite, small quantity of retained austenite and carbides. Oxidative and abrasive wear dominated the wear process in dry condition. During the corrosion process, the same mechanism of degradation was found in both the 0.5M NaCl and 0.5M H2SO4.

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“…That is, in T2 and M2, ductile fracture surfaces, considered as fracture surfaces of finely dispersed AF, can be seen. In Figure 11b-d, secondary cracks can be frequently found, and it is known that they are observed when crack resistance is excellent [46,47]. In conclusion, it is considered that the fine dispersion of AF with HAGB is the reason for the high absorbed energy of T2 and M2.…”

Section: Impact Toughness Of Tmcp Steel and Saw Heat-affected Zonementioning

confidence: 81%

Effect of Microstructure on Low-Temperature Fracture Toughness of a Submerged-Arc-Welded Low-Carbon and Low-Alloy Steel Plate

Choi

Kim

et al. 2021

Metals

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This study investigated the low-temperature fracture behavior of an 80-mm-thick low-carbon steel plate welded by submerged arc. The relationship between impact absorbed energy and ductility–brittle transition temperature (DBTT) based on the microstructures was evaluated through quantitative analysis on grain size and complex constituent phases using advanced EBSD technique. The microstructure formed differently depending on the heat affections, which determined fracture properties in a low-temperature environment. Among the various microstructures of the heat-affected zone (HAZ), acicular ferrite has the greatest resistance to low-temperature impact due to its fine interlocking formation and its high-angle grain boundaries.

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Analysis of Ductile Fracture Obtained by Charpy Impact Test of a Steel Structure Created by Robot-Assisted GMAW-Based Additive Manufacturing

Cited by 20 publications

References 32 publications

Influence of active cooling on microstructure and mechanical properties of wire arc additively manufactured mild steel

Influence of active cooling on microstructure and mechanical properties of wire arc additively manufactured mild steel

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Effect of Microstructure on Low-Temperature Fracture Toughness of a Submerged-Arc-Welded Low-Carbon and Low-Alloy Steel Plate

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