Residual thermal stress, fracture toughness, and hardness in WC-Co cemented carbide: Finite element simulation and experimental verification

He, Miao; Zheng, Xiaoyu; Tian, Haixia; Mei, Hong; Du, Yong

doi:10.1016/j.jmrt.2022.10.065

Cited by 23 publications

(4 citation statements)

References 28 publications

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“…Based on the results and in agreement with [40], the HSS 390 steel and WC-12Co coating suffer from residual tensile and compressive stresses, respectively. The residual compressive stress suffered from the WC-12Co coating, even if calculated by a simplified model, is higher than those previously reported for cermet coatings (e.g., −170 and −920 MPa for WC and Co phases, respectively, at room temperature in [36,42]). Moreover, it should be pointed out that this stress is higher than the compressive strength of the material; so, during the deposition process, the probability of crack initiation in the WC-12Co coating is quite high.…”

Section: Macrostructural Investigation Of the Sample In The As-built ...contrasting

confidence: 67%

“…At the Interface and inside Layer 1, rounded particles mixed with some polygonal ones can be observed (Figure 6a,b) together with a high quantity of herringbone eutectic carbides (Figure 6c,d). As already mentioned in Section 3.2, the chemical composition of -phase structures can be slightly different according to the process conditions [5,36,37]. From the EDS data collected in Table 4, it can be inferred that the -phase structures at the Interface and inside Layer 1 contain high quantities of Fe, W, Cr, and low amounts of Co (sites A and C).…”

Section: Microstructural Investigation Of the Sample In The As-built ...mentioning

confidence: 74%

“…Depending on the material properties and the process parameters, when the material is in a mushy state, with continuous and semi-continuous liquid films at the grain boundaries, the restricted resistant area is not able to support the stresses arising from the thermal constraints, thus inducing the generation of cracks [33,34]. In the literature, there are several studies regarding these mechanisms [35][36][37] with both the steep variation of the temperature induced by the AM process and the material properties considered the main key factors in crack generation. When stresses trapped inside the component are suddenly released, cracks emerge on the surface.…”

Section: Macrostructural Investigation Of the Sample In The As-built ...mentioning

confidence: 99%

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Effect of Post-Fabrication Heat Treatments on the Microstructure of WC-12Co Direct Energy Depositions

Morales,

Fortini,

Soffritti

et al. 2023

Coatings

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Laser-Directed Energy Deposition (L-DED) is an additive manufacturing technique that has lately been employed to deposit coatings of cemented carbides, such as WC-Co. During deposition, complex microstructural phenomena usually occur, strongly affecting the microstructural and mechanical behavior of the coatings. Post-fabrication heat treatments (PFHTs) may be applied to homogenize and strengthen the microstructure; nevertheless, to the best of the authors’ knowledge, just a few papers deepened the effect of these treatments on cemented carbides fabricated by additive manufacturing. This work evaluates the influence of four PFHTs on the microstructural evolution and hardness of L-DED WC-12Co. For each treatment, different combinations of solubilization time and temperature (between 30 and 180 min and from 400 °C to 700 °C, respectively) were adopted. The microstructure was investigated by optical and scanning electron microscopy equipped with energy-dispersive spectroscopy, whereas the mechanical properties were determined by Vickers hardness measurements. Based on the results, high microstructural heterogeneity in terms of WC particles, η-phase structures, and Co distribution was observed in the sample in the as-built condition. Some cracking defects were also observed in the samples, irrespective of the heat treatment conditions. Finally, a finer microstructure and a lower amount of brittle ternary η-phase, together with an increase in hardness (1030 ± 95 HV10), were found for the highest dwelling times (180 min) and for solubilization temperatures in the range of 500–600 °C.

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Section: Macrostructural Investigation Of the Sample In The As-built ...contrasting

confidence: 67%

Section: Microstructural Investigation Of the Sample In The As-built ...mentioning

confidence: 74%

Section: Macrostructural Investigation Of the Sample In The As-built ...mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Post-Fabrication Heat Treatments on the Microstructure of WC-12Co Direct Energy Depositions

Morales,

Fortini,

Soffritti

et al. 2023

Coatings

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“…The machine learning algorithms based on a neural network approach modelled and investigated such materials' behaviour. It was found that reducing the grain size improves the wear resistance, and the high-temperature crack resistance might be improved by adding some rare earth, such as La [29,30].…”

Section: Mechanical Properties Of the Printed And Sintered Wc-co Spec...mentioning

confidence: 99%

The Assessment of the Transversal Rupture Strength (TRS) and Hardness of WC-Co Specimens Made via Additive Manufacturing and Sinter-HIP

Jucan

Gădălean

Chicinaş

et al. 2023

Metals

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This study is focused on the mechanical properties of WC-Co composites obtained via Selective Laser Sintering (SLS) using PA12 as a binder. The as-printed samples were thermally debonded and sintered, first in a vacuum, and then sinter-HIP (Hot Isostatic Pressure) at 1400 °C, using 50 bar Ar, which has led to relative densities up to 66%. Optical metallographic images show a microstructure consisting of WC, with an average grain size in the range of 1.4–2.0 µm, with isolated large grains, in a well-distributed Co matrix. The shrinkage of the samples was 43%, with no significant shape distortion. The printing direction of the samples significantly impacts the transversal rupture strength (TRS). Nevertheless, the mechanical strength was low, with a maximum of 612 MPa. SEM images of the fracture surface of TRS samples show the presence of defects that constitute the cause of the low measured values. The hardness values position the obtained composites in the medium coarse classical cemented carbides range. The results were also related to the amount of free Co after sintering, close to the initial one, as assessed by magnetic measurements, indicating a low degree of interaction with PA12 decomposition products.

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Preparation of Rare Earth Modified Cobalt Powders by Ball Milling and Its Effects on Microstructure and Properties of WC-Co Cemented Carbide

Li,

Guo

et al. 2024

J. of Materi Eng and Perform

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Residual thermal stress, fracture toughness, and hardness in WC-Co cemented carbide: Finite element simulation and experimental verification

Cited by 23 publications

References 28 publications

Effect of Post-Fabrication Heat Treatments on the Microstructure of WC-12Co Direct Energy Depositions

Effect of Post-Fabrication Heat Treatments on the Microstructure of WC-12Co Direct Energy Depositions

The Assessment of the Transversal Rupture Strength (TRS) and Hardness of WC-Co Specimens Made via Additive Manufacturing and Sinter-HIP

Preparation of Rare Earth Modified Cobalt Powders by Ball Milling and Its Effects on Microstructure and Properties of WC-Co Cemented Carbide

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