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首页> 外文期刊>Journal of Materials Engineering and Performance >Transmission electron microscopy characterization of a Nb microalloyed steel for carburizing at high temperatures
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Transmission electron microscopy characterization of a Nb microalloyed steel for carburizing at high temperatures

机译：用于高温渗碳的Nb微合金钢的透射电子显微镜表征

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摘要

The carbide particles in AISI 5115 steel modified with added 0.038 wt.% Nb were characterized by means of transmission electron microscopy after simulation of carburizing heat treatments at high temperatures. The advantage of a high-temperature carburizing treatment over the standard 930 °C heat treatment is the significant reduction in the processing time. However, higher carburizing temperature leads to general and abnormal grain growth, which must be avoided by grain-pinning precipitates. The carburizing heat treatment simulations were performed at 950, 1000, and 1050 °C for 1 and 2 h in samples with two prior microstructural conditions: hot rolled and spheroidized. Characterization of the precipitates regarding composition, morphology, size, and distribution was performed using carbon extraction replicas and thin foil specimens. The results confirm the existence of complex Nb carbides. Particle size distribution curves, as log-normal functions, are shown to be extremely important in the interpretation of grain boundary pinning, rather than the mean particle size. The spheroidized samples showed a susceptibility to abnormal grain coarsening.
机译：在模拟高温渗碳热处理后，通过透射电子显微镜对AISI 5115钢中添加0.038 wt。％Nb改性的碳化物颗粒进行表征。与标准的930°C热处理相比，高温渗碳处理的优势在于可显着减少加工时间。但是，较高的渗碳温度会导致晶粒的总体生长和异常生长，必须通过固晶沉淀来避免。对渗碳热处理进行了模拟，分别在950、1000和1050℃下进行了1和2 h的样品，样品具有两个先前的微观结构条件：热轧和球化。关于沉淀物的组成，形态，大小和分布的表征使用碳提取复制品和薄箔样品进行。结果证实存在复杂的Nb碳化物。粒径分布曲线作为对数正态函数，对解释晶界钉扎（而非平均粒径）非常重要。球化样品显示出异常晶粒粗化的敏感性。

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