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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Failure Characteristics of Single-Crystal Fe-3%Al Alloy
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Fatigue Failure Characteristics of Single-Crystal Fe-3%Al Alloy

机译：单晶Fe-3％Al合金的疲劳失效特性

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摘要

To obtain a better understanding of the mechanical properties and failure characteristics of the single-crystal Fe-3%Al alloy (SC), tensile and fatigue properties of the SC and polycrystalline Fe-3%Al alloy (PC) have been investigated. The tensile strength and fracture strain for the SC samples were different depending on the loading direction, i.e., < 111 >, < 110 > and < 100 >, which could be explained by the Schmid factor. Fatigue strength for the SC samples was basically correlated with their tensile strength. Different fatigue properties were obtained for the PC sample, e.g., the high fatigue strength was obtained in the early fatigue stage, and significant reduction in the fatigue strength was appeared in the later fatigue stage, e.g., low endurance limit at 10(7) cycles. The reason for this was caused by the material brittleness due to the accumulated dislocation at the grain boundaries. Because the high ductile SC samples made severe plastic deformation ahead of the crack tip, the crack growth rate did not enhance even if the high stress intensity factor range was applied in Region II (da/dN versus Delta K). The crack growth rate dropped just before the final fracture. Effective stress intensity factor range was estimated using the crack closure model, but the crack growth rate is found to be affected strongly by the slip system of SC sample.
机译：为了更好地了解单晶Fe-3％Al合金（SC）的机械性能和失效特性，研究了SC和多晶Fe-3％Al合金（PC）的拉伸和疲劳性能。 SC样品的拉伸强度和断裂菌株根据负载方向，即，<111>，<110>和<100>不同，这可以通过施突因子解释。 SC样品的疲劳强度与其拉伸强度基本相关。获得PC样品的不同疲劳性质，例如，在早期疲劳阶段获得高疲劳强度，在后来的疲劳阶段出现疲劳强度的显着降低，例如10（7）个循环处的低耐久性限制。由于晶粒边界的累积位错引起的材料脆性引起的原因。由于高延性SC样品使裂纹尖端前方的严重塑性变形，即使在区域II中施加高应力强度因子范围，裂纹生长速率也没有增强（DA / DN与Delta K）。在最终骨折之前，裂纹的生长率掉落。使用裂缝闭合模型估计有效的应力强度因子范围，但发现裂缝生长速率受到SC样品的滑动系统强烈影响。

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