首页> 外文期刊>Journal of Materials Research >Fatigue behavior of an Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 amorphous steel
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Fatigue behavior of an Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 amorphous steel

机译:Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6非晶态钢的疲劳行为

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Four-point-bend fatigue experiments were conducted on the Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 bulk metallic glass (BMG), amorphous steel, under load control, employing an electrohydraulic machine, at a frequency of 10 Hz (using a sinusoidal waveform) with an R ratio of 0.1, where R = σ_(min.)/σ_(max.) (σ_(min.) and σ_(max.) are the applied minimum and maximum stresses, respectively). The test environment was laboratory air. Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 exhibited a high fatigue-endurance limit (682 MPa), which is found to be greater than those of the Zr-based BMG, Al-alloy, and high-nitrogen steel. However, the stress versus number of fatigue cycles curve of Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 revealed that the lifetime decreased abruptly with increasing the applied stress. The fatigue-fracture morphology indicated that Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6 has a significantly brittle fracture mode. Some fatigue cracks initiated from the inclusions or porosities, and the fatigue-crack propagation region was large. However, other cracks initiated from the outer tensile surface of the specimen, and the fatigue-crack propagation region was very small. The mechanisms of fatigue-crack initiation are suggested.
机译:使用电动液压机在负载控制下,对Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6大块金属玻璃(BMG),非晶态钢进行四点弯曲疲劳试验R值为0.1的10 Hz频率(使用正弦波形),其中R =σ_(最小)/σ_(最大)(σ_(最小)和σ_(最大)是施加的最小和最大应力,分别)。测试环境为实验室空气。 Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6表现出较高的疲劳强度极限(682 MPa),高于基于Zr的BMG,铝合金和高-氮钢。然而,Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6的应力与疲劳循环数曲线表明,寿命随着施加应力的增加而急剧下降。疲劳断裂形态表明,Fe_(48)Cr_(15)Mo_(14)Er_2C_(15)B_6具有明显的脆性断裂模式。由夹杂物或气孔引起的一些疲劳裂纹,疲劳裂纹扩展区域大。但是,其他裂纹是从试样的外拉伸表面开始的,疲劳裂纹的扩展区域很小。提出了疲劳裂纹萌生的机理。

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