Residual stress evolution enhanced martensite phase transition and texture development in cryogenic-tempered WC-Co ultra-coarse grained cemented carbide

Hua, Tao; Guo, Zhixing; Jing, Kaifeng; Xiong, Ji; Lei, Jun; Liu, Junbo

doi:10.1016/j.msea.2022.142592

Cited by 24 publications

(3 citation statements)

References 32 publications

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“…In case of the cemented carbides with ultrafine WC@10Co up to 16.67 wt-%, the hardness was consistent with this relationship. However, for the cemented carbide with 22.22 wt-% ultrafine WC@10Co and decreasing grain size, the hardness was reduced because of a decreasing relative density and a decreasing number of HCP-Co that may destroy the hardness [31].…”

Section: Resultsmentioning

confidence: 99%

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

Zhang

Tong

et al. 2023

Materials Science and Technology

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In this study, ultrafine WC@10Co powders were used for the fabrication of coarse-grained WC-10Co with almost full densification. The incorporation of WC@10Co resulted in a decreasing size of WC grain with a rounded shape, the mean free path of Co and the WC contiguity. Further, substantial Co with face-centered cubic structure dispersed uniformly in the cemented carbides with WC@10Co-contained intergranular fracture accompanied by a large number of plastic deformation tears of the Co phase at the fracture surface and crack bridges at the crack tip. Therefore, the hardness, fracture toughness and bending strength of cemented carbides with WC@10Co reached the highest levels of 1045.3 kgf m−2, 23.6 MPa·m1/2 and 2308 MPa, respectively. HIGHLIGHTS The ultrafine WC@10Co contracted size distribution of WC grain with a rounded shape. The uniformly dispersed Co with a high content of FCC structure was obtained. The as-obtained coarse-grained cemented carbides showed enhanced mechanical properties

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Section: Resultsmentioning

confidence: 99%

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

Zhang

Tong

et al. 2023

Materials Science and Technology

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“…Figure 8 shows the cumulative mass loss curves of WC-5Co, WC-8Co, and WC-10Co The results of residual compressive stress on the surface of WC-5Co, WC-8Co, and WC-10Co (untreated and DCT) are shown in Table 3. DCT can significantly increase the residual compressive stress of WC in cemented carbides; this is because when WC-Co receives deep cryogenic treatment, the low-temperature environment produces compressive and tensile stresses on WC and Co, and the resulting residual stresses increase the overall hardness and improve the wear resistance [33][34][35] (and, at the same time, the presence of residual stresses promotes the transition from α-Co to ε-Co, which has a higher corrosion resistance compared to α-Co [36][37][38][39]). In this experiment, the residual compressive stress of the WC surface in WC-5Co, WC-8Co, and WC-10Co increases by 84.11%, 91.38%, and 65.03%, respectively.…”

Section: Wear Resistancementioning

confidence: 99%

Improving Wear Resistance and Corrosive Resistance of Cemented Carbide for Mud Pulser Rotor by Deep Cryogenic Treatment

Zhang,

Wu,

Tian

et al. 2024

Materials

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Cemented carbide used in the rotor of a mud pulser is subjected to the scouring action of solid particles and corrosive mud media for a long time, which causes abrasive wear and electrochemical corrosion. To improve the wear and corrosive resistance of cemented carbide, samples with different cobalt content (WC-5Co, WC-8Co, and WC-10Co) receive deep cryogenic treatment (DCT) at −196 °C for 2.5 h. An optical metalloscope (OM) and X-ray diffractometer (XRD) are used to observe the phase changes of cemented carbides, and the XRD is also used to observe the change in residual stress on the cemented carbide’s surface. A scanning electron microscope (SEM) is used to characterize the wear and electrochemical corrosion surface microstructure of cemented carbides (untreated and DCT). The results show that the DCT promotes the precipitation of the η phase, and the diffraction peak of ε-Co tends to intensify. Compared with the untreated, the wear rates of WC-5Co, WC-8Co, and WC-10Co can be reduced by 14.71%, 37.25%, and 41.01% by DCT, respectively. The wear form of the cemented carbides is mainly the extrusion deformation of Co and WC shedding. The precipitation of the η phase and the increase in WC residual compressive stress by DCT are the main reasons for the improvement of wear resistance. The electrochemical corrosion characteristic is the dissolution of the Co phase. DCT causes the corrosion potential of cemented carbide to shift forward and the corrosion current density to decrease. The enhancement of the corrosion resistance of cemented carbide caused by DCT is due to the Co phase transition, η phase precipitation, and the increase in the compressive stress of cemented carbide.

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“…Хватова. На сегодняшний день активно ведутся работы в этом направлении Российскими и зарубежными учеными [7][8][9][10][11][12][13].…”

Section: литературный обзорunclassified

Development and testing of a device for non-destructive testing of hard alloys

Tsybriy,

Kozelkov,

Koval

2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE RELEVANCE of the work lies in the need to control the cutting inserts of metalworking tools, which are widely used today in production and used in the machining of products for various purposes in mechanical engineering. The production of carbide plates involves a number of operations: obtaining fine powders, mixing them in certain proportions, shaping, followed by pressing and sintering. Violation of the technology of at least one of the considered operations leads to the production of defective plates, the quality of which does not meet the requirements. The use of such plates in production leads to the production of defective products or an increase in the complexity of their manufacture, which is associated with the need for their frequent replacement. Traditional control methods have a significant drawback - the destruction of the product or its damage. They can be avoided using non-destructive testing methods, which include the coercive force method. The authors proposed a device of an original design, which makes it possible to implement non-destructive testing of the considered products made of hard alloys of various grades. To test its performance, a prototype was developed and tested. THE PURPOSE. Development of a device for non-destructive testing of products made of hard alloys and its testing in order to determine the relative error. The task is relevant, since there is a need for enterprises to control the quality of replaceable carbide inserts of metalworking tools. METHODS. During testing of the device, generally accepted empirical research methods were used, and the determination of the relative error was carried out according to the methodology developed for the Koerzimat 1.097 HcJ coercimeter, as well as using generally accepted methods of mathematical statistics. RESULTS. The electrical structural and principal diagrams of the device have been developed, and its design parameters have been determined. Tests of the device were carried out, during which measurements of the coercive force were made for samples made of various grades of hard alloys and having different shapes and sizes. CONCLUSION. The design of the developed device is characterized by simplicity and low cost; at the same time, it is based on a modern element base. The test results of the device showed that the relative measurement error is within acceptable limits, which allows it to be used to control products made of hard alloys in production conditions.

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Residual stress evolution enhanced martensite phase transition and texture development in cryogenic-tempered WC-Co ultra-coarse grained cemented carbide

Cited by 24 publications

References 32 publications

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

Improving Wear Resistance and Corrosive Resistance of Cemented Carbide for Mud Pulser Rotor by Deep Cryogenic Treatment

Development and testing of a device for non-destructive testing of hard alloys

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