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A study on the microstructure and mechanical properties of AISI D2 tool steel modified by niobium

机译：铌改性AISI D2工具钢的组织和力学性能研究

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摘要

The microstructure and mechanical properties of AISI D2 tool steel with up to 1.5 wt% niobium additions were investigated. The microstructural evolutions were characterized by means of optical microscopy and scanning electron microscopy techniques. Mechanical properties of the samples were measured using tensile testing, hardness measurements and Charpy impact test. The results indicated that modification of the microstructure was effectively achieved through the addition of 1.5 wt% of niobium, which refined the prior-austenite grains and decreased the volume fraction of eutectic carbides. Also, the eutectic carbide network tended to break thereby forming blocky and ribbon-like morphologies in the eutectic structures. The ductility and impact toughness of the niobium-contained steels were increased considerably and reached to about 5.8% and 15 J/cm~2, respectively. Generally, the results of this study suggest that niobium can be used as an alloying element to significantly enhance the ductility and impact toughness of D2 tool steel without affecting the hardness.
机译：研究了添加量高达1.5 wt％的AISI D2工具钢的组织和力学性能。通过光学显微镜和扫描电子显微镜技术表征了微观结构的演变。使用拉伸试验，硬度测量和夏比冲击试验测量样品的机械性能。结果表明，通过添加1.5wt％的铌有效地实现了显微组织的改性，其细化了原始奥氏体晶粒并降低了共晶碳化物的体积分数。而且，共晶碳化物网络趋于破裂，从而在共晶结构中形成块状和带状形态。含铌钢的延展性和冲击韧性显着提高，分别达到约5.8％和15 J / cm〜2。通常，这项研究的结果表明，铌可以用作合金元素，以显着提高D2工具钢的延展性和冲击韧性，而不会影响硬度。

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