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采用激光熔覆技术在Q235B钢表面制备了不同Ti3SiC2含量的Fe55/Ti3SiC2复合涂层,并利用光学显微镜、扫描电镜、X射线衍射仪、硬度仪、摩擦磨损机和电化学工作站等研究了涂层的显微组织、物相及综合性能。结果表明:由于Ti3SiC2的加入及其在高温下分解降低了熔池的换热特性等综合因素,导致Fe55/Ti3SiC2复合涂层的晶粒粗化;随着Ti3SiC2的添加,Fe55/Ti3SiC2复合涂层中形成了Cr7C3、SiC、CrC和TiSi等硬质相,组织变得粗大,并且α-Fe相的尺寸粗大及含量增加,而复合涂层中产生的硬质相不足以抵消晶粒粗化以及α-Fe硬度较小而发生软化所降低的硬度,综合导致了复合涂层的硬度下降。Fe55/Ti3SiC2复合涂层中形成的金属硅化物TiSi具有良好的抗氧化性能,减小了氧化磨损中因氧化膜脆性和疏松产生的加剧磨损,因此,足以抵消因硬度降低以及摩擦系数增大的影响,使得Ti3SiC2添加量为2%的涂层具有最高的耐磨性。
Abstract：Fe55/Ti3SiC2 composite coatings with different Ti3SiC2 contents were prepared on the surface of Q235 B steel by laser cladding technology, and microstructure, phase and comprehensive properties of the coatings were studied by means of optical microscope, scanning electron microscopy, X-ray diffractometer, hardness tester, friction and wear machine and electrochemical workstation. The results show that the addition of Ti3SiC2 and its decomposition at high temperature reduce the heat transfer characteristics of the molten pool, resulting in the grain coarsening of the Fe55/Ti3SiC2 composite coatings. With the addition of Ti3SiC2, hard phases such as Cr7C3, SiC, CrC and TiSi are formed in the Fe55/Ti3SiC2 composite coatings, the microstructure becomes coarse, and the size and content of α-Fe phase increase, and while the hard phase produced in the composite coatings is not enough to offset the reduced hardness caused by the grain coarsening and softening due to the small hardness of α-Fe, the hardness of the composite coatings decreases. The metal silicide TiSi formed in the Fe55/Ti3SiC2 composite coating has good oxidation resistance and can reduce the aggravated wear caused by the brittleness and looseness of the oxide film in the oxidation wear, which is enough to offset the influence of the decrease of hardness and the increase of friction coefficient, so that the composite coating with the addition Ti3SiC2 content of 2 mass% has the highest wear resistance.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2021-0256
中图分类号:TG174.4;TG665
引用信息:
[1]张慧,庞铭.Ti_3SiC_2含量对Q235B钢表面激光熔覆Fe基耐磨涂层性能的影响[J],2022,43(01):148-156.DOI:10.13289/j.issn.1009-6264.2021-0256.
基金信息:
国家自然科学基金(52075559)