Effect of deep cryogenic treatment on the mechanical properties of ultrafine WC-Co composite

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-08 DOI:10.1016/j.ijrmhm.2025.107429

Pan Mao , Jinfeng Peng , Kun Chen , Chunde Zhou , Jiangxiong Gao , Xianxin Zhang , Xiangwu Xiao , Xiaotao Wu , Ruitao Peng

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引用次数: 0

Abstract

The effects of deep cryogenic treatment (DCT) soaking time (0, 2, 6, 12, 24 and 48 h) on the microstructural evolution and mechanical properties of an ultrafine WC-Co composite were investigated in detail. The microstructure, phase composition, residual stress, and mechanical properties of cemented tungsten carbide specimens were enhanced after DCT. With the optimal DCT soaking time of 2 h, ultrafine cemented tungsten carbide exhibited the highest hardness and wear resistance. The wear rate of treated specimens was reduced by 24% compared to the untreated specimens. The fracture toughness increased by 17% after 12 h of DCT. A cost-benefit analysis of mechanical enhancements and processing efficiency identified the 2 h as the optimal DCT soaking time. Deep cryogenic treatment caused the refinement of WC grains, precipitation of η phase, martensitic phase transformation, and an increase in residual compressive stress in cemented tungsten carbide. These factors collectively enhanced the hardness, fracture toughness, and wear resistance of cryogenically treated cemented tungsten carbide.

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深冷处理对超细WC-Co复合材料力学性能的影响

研究了深度低温处理（DCT）浸泡时间（0、2、6、12、24和48 h）对超细WC-Co复合材料组织演变和力学性能的影响。经DCT处理后，硬质合金试样的显微组织、相组成、残余应力和力学性能均得到改善。当DCT最佳浸泡时间为2 h时，超细硬质合金的硬度和耐磨性最高。与未处理的样品相比，处理后的样品磨损率降低了24%。DCT处理12 h后，断裂韧性提高17%。机械增强和加工效率的成本效益分析表明，2小时是最佳的DCT浸泡时间。深冷处理导致WC晶粒细化，η相析出，马氏体相变，残余压应力增大。这些因素共同提高了低温处理硬质合金的硬度、断裂韧性和耐磨性。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.