Determination of the KIC Fracture Toughness of the X210Cr12 High-Strength Material

Ergun Ateş
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Abstract

Purpose: It is an important problem that the machines become unusable due to the deformation of the machine elements produced before the planned time. In this study, it was aimed to determine the KIC value of X210Cr12, which is a high strength material. In this way, more accurate load values can be used in the design.Methods: In the experimental study to determine the KIC value, the sample geometry, the crack depth, the load-dependent parameters and calculations and some conformity checks were carried out. Experimental system; KIC consists of 3-point flexure specimens, a press, an electronic circuit capable of detecting the change in load crack opening, and a logger.Findings: In the study, the loads were determined from experimental graphs. Subsequently, load-crack opening values were determined. With these data, the KIC values were calculated as 719,7 and 839,7 MPa.mm1/2 as the minumum and maximum values, respectively.Conclusion: The experimental graphs are in the form of curves that break abruptly with unstable crack propagation without showing plastic deformation. There is no study in the literature on the KIC value of X210Cr12 and it has been determined that it has a low KIC value compared to the high-strength steels studied. It is valuable to determine the KIC value, as fracture problems may occur in designs prepared with the material. The results of the study are data at room temperature.
测定 X210Cr12 高强度材料的 KIC 断裂韧性
目的:由于在计划时间之前生产的机器元件发生变形而导致机器无法使用,这是一个重要问题。本研究旨在确定高强度材料 X210Cr12 的 KIC 值。这样,就可以在设计中使用更精确的载荷值:在确定 KIC 值的实验研究中,进行了试样几何形状、裂纹深度、与载荷有关的参数和计算以及一些符合性检查。实验系统;KIC 由三点挠曲试样、压力机、能够检测荷载裂缝开口变化的电子电路和记录仪组成:在这项研究中,荷载是根据实验图表确定的。随后,确定了荷载-裂缝张开值。根据这些数据,计算出 KIC 值的最小值和最大值分别为 719.7 和 839.7 MPa.mm1/2:实验图形呈曲线形式,随着不稳定的裂纹扩展而突然断裂,没有出现塑性变形。文献中没有关于 X210Cr12 的 KIC 值的研究,与所研究的高强度钢相比,X210Cr12 的 KIC 值较低。确定 KIC 值很有价值,因为在使用该材料进行设计时可能会出现断裂问题。研究结果是室温下的数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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