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Chromium-doped Fe-Co-Ni binders for diamond cutting tools: The features of the structure, mechanical properties, and adhesion to diamond
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-05-26 , DOI: 10.1016/j.ijrmhm.2020.105289
P.A. Loginov , U.A. Zhassay , M.Ya. Bychkova , M.I. Petrzhik , S.K. Mukanov , D.A. Sidorenko , A.S. Orekhov , S.I. Rupasov , E.A. Levashov

This study is aimed at the development of novel chromium-doped Fe-Co-Ni binders for diamond cutting tools with enhanced mechanical properties, wear resistance and adhesion to diamond single crystals. Fe-Co-Ni-Cr powder mixtures were prepared by mechanical alloying to obtain uniform elemental distribution. The dependence of the mechanical properties of hot-pressed Fe-Co-Ni-Cr binders on Cr concentration has been studied. The Fe-Co-Ni-7%Cr binder fabricated by means of mechanical alloying and hot pressing is characterized by the maximal strength (3220 MPa) and hardness (114 HRB), which are due to the reduced stacking faults energy, caused by dissolution of chromium in α-Fe solid solution, and formation of Cr2O3 nanoparticles, which impede the dislocation gliding. The wear resistance of the Fe-Co-Ni-7%Cr binder with uniformly dissolved chromium is tenfold higher than that of the binder having the same composition but containing chromium as an individual phase. The presence of Cr in the binder leads to the improvement of its adhesion to diamond single crystals. Studies of the surface of diamond single crystals at fractures of diamond-containing segments showed that adhesion was improved due to the formation of chromium carbide (Cr3C2) sublayers.



中文翻译:

用于金刚石切削工具的掺铬Fe-Co-Ni粘结剂:结构,机械性能和对金刚石的附着力

这项研究旨在开发新型的铬掺杂的Fe-Co-Ni粘结剂,用于金刚石切削刀具,该粘结剂具有增强的机械性能,耐磨性和对金刚石单晶的附着力。通过机械合金化制备Fe-Co-Ni-Cr粉末混合物,以获得均匀的元素分布。研究了热压Fe-Co-Ni-Cr粘合剂的机械性能对Cr浓度的依赖性。通过机械合金化和热压法制备的Fe-Co-Ni-7%Cr粘结剂的特征在于最大强度(3220 MPa)和硬度(114 HRB),这是由于溶解引起的堆垛层错能量降低所致铁中固溶态铬的形成及Cr 2 O 3的形成纳米粒子,阻碍位错滑动。具有均匀溶解的铬的Fe-Co-Ni-7%Cr粘合剂的耐磨性比具有相同组成但含有铬作为单相的粘合剂的耐磨性高十倍。粘合剂中Cr的存在导致其与金刚石单晶的粘合性提高。对含金刚石链段断裂处的金刚石单晶表面的研究表明,由于形成了碳化铬(Cr 3 C 2)亚层,附着力得到了改善。

更新日期:2020-05-26
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