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Effects of niobium addition on microstructure and tensile behavior of as-cast ductile iron

机译：铌添加对球墨铸铁组织和拉伸性能的影响

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摘要

The effects of niobium addition up to 0.11 wt% on the microstructure and tensile properties of as-cast ductile iron (ACDI) were investigated. Metallograpbic analyses by both optical microscopy (OM) and scanning electron microscopy (SEM) indicated that niobium (Nb) promoted the formation of pearlite, reduced pearlite lamellar spacing and decreased the extent of graphitization taking place in the Nb-alloyed ACDI. The nodularity and nodule counts of graphite changed insignificantly when the Nb content was less than 0.08 wt% in the ACDI. The analysis of precipitates by transmission electron microscopy (TEM) revealed that nano and micro sized (Nb, Ti) C carbides acted as nucleation site for graphites, and promoted the formation of large graphite nodules with low roundnesses as Nb content rose above 0.08 wt%. The results of tensile testing showed that the yield strength, ultimate tensile strength and elongation of the ACDI with 0.08 wt% Nb increased by 12.1%, 11.2% and 14.396 over those of the Nb-free ACDI, respectively. The optimum values of the yield strength, tensile strength and elongation of the Nb-alloyed ACDI were found to be 418 MPa, 746.0 MPa and 8.0%, respectively, at the Nb content of 0.08 wt%. The high strain hardening rates of the Nb-containing ACDIs implied that they were capable of spontaneously strengthening itself increasingly to a large extent, in response to a slight plastic deformation after yielding.
机译：研究了铌添加量高达0.11 wt％对铸态球墨铸铁（ACDI）的组织和拉伸性能的影响。通过光学显微镜（OM）和扫描电子显微镜（SEM）进行的金属对金属的分析表明，铌（Nb）促进了珠光体的形成，珠光体片层间距的减小，并且降低了Nb合金ACDI中发生的石墨化程度。当ACDI中的Nb含量小于0.08 wt％时，石墨的结核和结核计数无明显变化。通过透射电子显微镜（TEM）分析沉淀物发现，纳米和微米级（Nb，Ti）C碳化物充当石墨的成核位点，并且当Nb含量超过0.08 wt％时，促进了低圆度的大石墨结节的形成。 。拉伸试验的结果表明，与不含Nb的ACDI相比，含0.08 wt％Nb的ACDI的屈服强度，极限拉伸强度和伸长率分别提高了12.1％，11.2％和14.396。 Nb含量为0.08 wt％时，Nb合金ACDI的最佳屈服强度，拉伸强度和伸长率的最佳值分别为418 MPa，746.0 MPa和8.0％。含Nb的ACDI的高应变硬化速率意味着它们能够响应屈服后的轻微塑性变形而在很大程度上自发地自我增强。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|416-428|共13页
  • 作者

    Xiangru Chen; Jie Xu; Henry Hu; Hardy Mohrbacher; Ming Kang; Wei Zhang; Aimin Guo; Qijie Zhai;

  • 作者单位

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    Department of Mechanical, Automotive and Materials Engineering University of Windsor, 401 Sunset Avenue, Windsor, Ontario, Canada N9B 3P4;

    NiobelCon bvba, Swaenebeecklaan, 2970 Schilde, Belgium;

    Dongfeng Commercial Vehicle Co., Ltd., Wuhan 430056, China;

    CITIC Metal Co., Ltd., Beijing 100004, China;

    CITIC Metal Co., Ltd., Beijing 100004, China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

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  • 正文语种 eng
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  • 关键词

    As-cast ductile iron; Niobium; Microstructure; (Nb; Ti) C nano precipitate; Tensile behavior; Fracture;

    机译：铸铁球墨铸铁;铌;微观结构（Nb;Ti）C纳米沉淀;拉伸行为;断裂;

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