Fracture and fatigue behavior of a γ-phase containing WC-Co cemented carbide

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-03-17 DOI:10.1016/j.jeurceramsoc.2025.117376

M. Serra , F. García-Marro , N. Cinca , E. Tarrés , E. Jiménez-Piqué , L. Llanes

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Abstract

This study analyzes the microstructural effects of a third phase on fracture and fatigue characteristics of WC-based cemented carbides. A γ-phase-containing (three-phase) hardmetal grade is investigated and compared to a reference two-phase system, with similar binder content and WC grain size. Isolation of the mixed cubic carbides (third phase) out of the binder plays a key role on determining the fracture and fatigue characteristics. Consequently, coarser microstructural heterogeneities are found acting as critical flaws, decreasing strength, under both monotonic and cyclic loading. Conversely, γ-phase promotes a ceramic-like transgranular crack path for stable crack extension under cyclic loading, yielding lower fatigue sensitivity. Fatigue mechanics and mechanisms of the γ-phase grade align with those of WC-Co systems, independent of crack size. The combined use of pristine and pre-cracked specimens effectively correlates strength, fracture toughness, and fatigue life with estimated and experimentally determined fatigue crack growth exhibited by natural and long through-thickness cracks.

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含γ相WC-Co硬质合金的断裂和疲劳行为

本研究分析了第三相对wc基硬质合金断裂和疲劳特性的微观组织影响。研究了一种含γ相（三相）硬质合金品位，并将其与具有相似粘结剂含量和WC晶粒尺寸的参考两相体系进行了比较。从粘结剂中分离出混合立方碳化物（第三相）对确定断裂和疲劳特性起着关键作用。因此，在单调加载和循环加载下，较粗的微观组织非均质被发现作为临界缺陷，降低了强度。相反，在循环加载下，γ相促进了陶瓷样的穿晶裂纹路径，使裂纹稳定扩展，产生较低的疲劳敏感性。γ相等级的疲劳力学和机制与WC-Co体系一致，与裂纹尺寸无关。原始和预裂试样的结合使用有效地将强度、断裂韧性和疲劳寿命与估计的和实验确定的自然和长透厚裂纹所表现出的疲劳裂纹扩展联系起来。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.