316L不锈钢表面Ni-Ti合金薄膜的力学特性研究

发布时间：2018-07-26 06:49

【摘要】：目的提高316L不锈钢表面的硬度及耐磨性能。方法采用磁控溅射法在316L不锈钢表面制备Ni-Ti合金薄膜,并通过纳米压入法对316L不锈钢表面、Ni-Ti合金薄膜和Ni-Ti合金材料的力学性能进行测试,分析不锈钢基Ni-Ti薄膜的耐磨性能。应用有限元反演分析方法求解基体和薄膜的弹塑性幂本构关系。结果316L不锈钢与Ni-Ti合金抵抗载荷的能力较弱,但316L不锈钢表面Ni-Ti薄膜抵抗外加载荷的能力较强,且抵抗塑性变形的能力得到强化。Ni-Ti薄膜、316L不锈钢基体和Ni-Ti合金的硬度分别为8.2795、5.2405、2.9498 GPa,薄膜的硬度明显大于基体和Ni-Ti合金,说明Ni-Ti薄膜使得316L不锈钢的耐磨性显著提高。薄膜的弹性性能较基体与Ni-Ti合金有明显优势。为研究薄膜的弹塑性性能,建立ABAQUS二维有限元模型,考虑Berkovich压头和试样之间摩擦系数为0.16,通过纳米压入实验和有限元分析的对比,反演分析分别计算得到基体和薄膜的特征应力、特征应变、应变强化因子,继而确定初始屈服应力,得到Ni-Ti合金薄膜和316L不锈钢基体的弹塑性幂本构关系。结论 Ni-Ti薄膜具有良好的力学特性,使316L不锈钢表面的硬度显著提高,因此有效提高了不锈钢的耐磨性能。
[Abstract]:Objective to improve the hardness and wear resistance of 316L stainless steel surface. Methods Ni-Ti alloy films were prepared on the surface of 316L stainless steel by magnetron sputtering. The mechanical properties of Ni-Ti alloy films and Ni-Ti alloy materials on 316L stainless steel were measured by nano-indentation method, and the wear resistance of Ni-Ti films on stainless steel substrates was analyzed. The finite element inversion method is used to solve the elastoplastic power constitutive relation of substrate and thin film. Results the ability of 316L stainless steel and Ni-Ti alloy to resist the load was weak, but the ability of Ni-Ti film on the surface of 316L stainless steel to resist the external load was stronger than that on the surface of 316L stainless steel. The hardness of 316L stainless steel substrate and Ni-Ti alloy were 8.2795 ~ 5.2405 ~ 2.9498 GPa. the hardness of the film was obviously higher than that of the substrate and Ni-Ti alloy, which indicated that the wear resistance of 316L stainless steel was significantly improved by Ni-Ti film. The elastic properties of the film are superior to that of the substrate and Ni-Ti alloy. In order to study the elastoplastic properties of the film, the ABAQUS two-dimensional finite element model was established. The friction coefficient between the Berkovich head and the specimen was 0.16. The comparison between the nano-indentation experiment and the finite element analysis was carried out. The characteristic stress, characteristic strain and strain strengthening factor of substrate and film were calculated by inverse analysis, then the initial yield stress was determined, and the elastoplastic power constitutive relation of Ni-Ti alloy film and 316L stainless steel substrate was obtained. Conclusion the Ni-Ti film has good mechanical properties, and the hardness of 316L stainless steel surface is improved significantly, so the wear resistance of stainless steel is improved effectively.
【作者单位】： 太原理工大学应用力学与生物医学工程研究所;太原理工大学力学学院;
【基金】：国家自然科学基金(11172195)~~
【分类号】：TG174.444

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