60NiTi合金组织结构与耐磨性关联性研究进展

Research progress of 60NiTi alloy: relationships between microstructure and wear resistance

  • 摘要: 与传统工具钢、不锈钢等轴承材料(如M50、440C)相比,60NiTi合金因具有弹性模量低(约为100 GPa)、硬度高(58~62 HRC)、密度低(6.71 g/cm3)、可恢复应变量大(5%)、比强度高、无磁性、尺寸稳定性好、耐腐蚀性强且具有良好的可润滑性等诸多优点,而成为可长寿命服役高端轴承的理想材料。尽管如此,60NiTi合金的抗磨损性能却远不如传统的工具钢和不锈钢等轴承材料,这在一定程度上限制了其应用与发展。因此,改善60NiTi合金的耐磨性已成为当前研究的前沿与热点。本文全面阐述了研究学者基于合金化、热处理、表面强化处理等方式提高60NiTi合金耐磨性的研究进展。并系统综述了诸类强化方式对60NiTi合金的微观组织结构、马氏体相变行为、力学与功能特性的影响规律与作用机制。另外,针对当前60NiTi合金存在的问题,本文指出了未来的研究方向。

     

    Abstract: Compared with traditional tool steel, stainless steel bearing materials (such as M50, 440C), 60NiTi alloy has various advantages such as low elastic modulus (~100 GPa), high hardness (58~62 HRC), low density (6.71 g/cm3), large recoverable strain (5%), high specific strength, non-magnetic, good dimensional stability, superior corrosion resistance and good lubricity, which promotes to becomes the ideal material for high performance bearings with long service life. However, the wear resistance of 60NiTi alloy is far less than that of traditional bearing materials such as tool steel and stainless steel, which limits its application and development to some extent. Hence, the researche on improving the wear resistance of 60NiTi alloy has become the forefront and hot spot of current research. In the present paper, the research progress of improving the wear resistance of 60NiTi alloy based on alloying, heat treatment and surface strengthening is comprehensively clarified. Meanwhile, the effects of various strengthening methods on the microstructure, martensitic transformation behavior, mechanical and functional properties of 60NiTi alloy are reviewed. In addition, in view of the existing problems of 60NiTi alloy, the future research directions of 60NiTi alloy were put forward.

     

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