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Structure-property correlation of EN steel and evaluation of mechanical properties through BIT

机译：EN钢的结构特性相关性和通过BIT评估力学性能

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摘要

The present studies deal with the evaluation of mechanical properties through Ball Indentation Technique (BIT) for En steel, having varying microstructure due to specific heat treatment imparted. Investigations have been carried out on four types of failed shaft materials. The dependence of yield strength (YS), ultimate tensile strength (UTS), strength coefficient (K) and strain hardening exponent (n) values on various microstructural features is studied using the BI technique and the results are validated with the standard conventional test results. It is found that indentation diameters (plastic) measured by linear variable displacement transducer (LVDT) are slightly less than the diameters measured by optical microscope and this is due to pile-up/sink-in of materials surrounding the indentations. So the determination of mechanical properties, using LVDT measured depth, requires addition of correction factor for getting actual contact diameter. This structure-property correlation study clearly proved the effectiveness of the BI set-up to find the small changes in mechanical properties due to heat treatment on the same group of material.
机译：目前的研究是通过球压痕技术（BIT）对En钢进行的机械性能评估，由于施加了特定的热处理，该组织具有变化的微观结构。已经对四种类型的失效轴材料进行了调查。使用BI技术研究了屈服强度（YS），极限抗拉强度（UTS），强度系数（K）和应变硬化指数（n）值对各种微结构特征的依赖性，并用标准的常规测试结果验证了结果。发现线性可变位移传感器（LVDT）测量的压痕直径（塑料）略小于光学显微镜测量的直径，这是由于压痕周围材料的堆积/沉入所致。因此，使用LVDT测量深度确定机械性能时，需要添加校正因子以获得实际的接触直径。这项结构属性相关性研究清楚地证明了BI设置的有效性，该BI设置可以发现由于在同一组材料上进行热处理而导致的机械性能的微小变化。

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