Fatigue crack growth of WC–Co cemented carbides: a comparative study using small indentation flaws and long through-thickness cracks

IF 2.2 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Fracture Pub Date : 2024-04-18 DOI:10.1007/s10704-024-00777-4

S. Fooladi Mahani, C. Liu, F. García-Marro, L. L. Lin, L. Cabezas, X. Wen, N. Mansilla, L. Llanes

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Abstract

The fatigue crack growth behavior of a submicron-grained WC–Co hardmetal is investigated by artificially introducing small flaws by means of sharp indentation. Similar fatigue testing is also conducted on notched specimens with long through-thickness cracks for comparison purposes. The use of controlled small indentations flaws is shown to be a valid and successful approach for studying and describing crack growth behavior under cyclic loading for the material under consideration. This statement is based on the similitude found in fatigue mechanics and mechanisms between both crack types. Regarding the former, accounting of the indentation-induced residual stresses is key to rationalize the experimental findings. Concerning the latter, inspection of crack-microstructure interaction as well as fracture surfaces permit to discern similar features and scenarios, at both meso- and micrometric length scales. Results from this research yield an immediate practical implication, as indentation techniques may then be proposed as an alternative testing route for investigating fatigue crack growth behavior of hardmetal grades where sharp indentation is capable to induce well-developed radial crack systems.

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WC-Co 硬质合金的疲劳裂纹生长：使用小压痕缺陷和长贯穿裂纹的比较研究

通过锐利的压痕人为引入小缺陷，研究了亚微粒级 WC-Co 硬金属的疲劳裂纹生长行为。为了进行比较，还对带有长贯通裂纹的缺口试样进行了类似的疲劳测试。结果表明，使用受控小压痕缺陷是一种有效且成功的方法，可用于研究和描述所考虑材料在循环加载下的裂纹生长行为。这种说法基于两种裂纹类型在疲劳力学和机理上的相似性。对于前者，考虑压痕引起的残余应力是使实验结果合理化的关键。至于后者，通过检查裂纹与微结构的相互作用以及断裂表面，可以在中尺度和微米长度尺度上发现类似的特征和情况。这项研究的结果具有直接的实际意义，因为压痕技术可以作为研究硬金属疲劳裂纹生长行为的另一种测试途径，因为尖锐的压痕能够诱发发达的径向裂纹系统。

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来源期刊

International Journal of Fracture 物理-材料科学：综合

CiteScore

4.80

自引率

8.00%

发文量

审稿时长

13.5 months

期刊介绍： The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications. The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged. In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.