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Microstructure and wear behavior of austempered high carbon high silicon steel

机译：奥斯特型高碳高硅钢的微观结构和磨损行为

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摘要

In the present investigation, the influence of austempering temperature and time on the microstructure and dry sliding wear behavior of high silicon steel was studied. The test specimens were initially austenitised at 900°C for 30 minutes, thereafter austempered at various temperatures 280°C, 360°C and 400°C, for varying duration from 30 to 120 minutes. These samples after austempering heat treatment were subsequently air cooled to room temperature, to generate typical ausferritic microstructures and then correlated with the wear property. The test outcomes demonstrate the slight increase in specific wear rate with increase in both austempering temperature and time. Specific wear rate was found to be minimum at an austempering temperature of 280°C, that exhibits lower bainite microstructure with high hardness, on the other hand specific wear rate was found to be slightly high at increased austempering temperatures at 360°C and 400°C, due to the upper bainite structure that offered lower hardness to the matrix. The sample austempered at 280°C for 30 minutes offered superior wear resistance when compared to other austempering conditions, mainly due to the presence of fine acicular bainitic ferrite along with stabilized retained austenite and also some martensite in the microstructure.
机译：在本研究中，研究了高硅钢的温度和时间对高硅钢的微观结构和干滑动磨损行为的影响。最初在900℃下最初允许试样30分钟，然后在各种温度为280℃，360℃和400℃的各种温度下，从30至120分钟的不同持续时间。在常常渗透热处理后的这些样品随后将空气冷却至室温，以产生典型的间隙微结构，然后与磨损性能相关。试验结果表明特定磨损率的略微增加，随着奥斯特温度和时间的增加。发现特定的磨损率在280℃的常见温度下最小，其表现出具有高硬度的贝氏体微观结构，另一方面发现特定的磨损率在360°C和400°的增加的奥氏体温度下略微高。 C，由于贝氏体结构较低的贝氏体结构。与其他奥斯特敏感条件相比，在280℃下静置的样品在280°C时30分钟，主要是由于存在精细针状诱导的诱导的保留奥氏体和微观结构中的一些马氏体的存在时较高的耐磨性。

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