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首页> 外文期刊>Journal of Materials Engineering and Performance >Over-Aging Effect on Fracture Toughness of Beryllium Copper Alloy C17200
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Over-Aging Effect on Fracture Toughness of Beryllium Copper Alloy C17200

机译：过度时效对铍铜合金C17200断裂韧性的影响

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This study experimentally increased the fracture toughness of Beryllium Copper (CuBe) UNS C17200 alloy using three different age hardening processes. At the same time, the micro- and macro-fracture behavior of this alloy were comprehensively studied. ASTM E399 fracture toughness, tensile, and Charpy impact tests were conducted for all three heat-treated rods. The fracture surfaces were examined under both an optical microscope and a scanning electron microscope to investigate the failure mechanisms. Multiple test orientations were considered to explore isotropy. Increasing the temperature and duration at which age hardening was performed increased fracture toughness while decreasing ultimate tensile strength. The maximum fracture toughness was reached on the most overaged specimen, while retaining a serviceable tensile strength. The specimen test data allowed a relationship to be established among Charpy impact toughness, fracture toughness, and yield strength. Analysis of fracture behavior revealed an interesting relationship between fracture toughness and pre-cracking fatigue propagation rate.
机译：这项研究使用三种不同的时效硬化工艺，通过实验提高了铍铜（CuBe）UNS C17200合金的断裂韧性。同时，对该合金的微观和宏观断裂行为进行了全面研究。对所有三个热处理过的棒材均进行了ASTM E399断裂韧性，拉伸和夏比冲击试验。在光学显微镜和扫描电子显微镜下检查断裂表面，以研究破坏机理。考虑采用多种测试方向来探索各向同性。增加进行时效硬化的温度和持续时间会增加断裂韧性，同时会降低极限抗拉强度。在最老化的试样上达到最大断裂韧性，同时保持有用的拉伸强度。样品测试数据允许在夏比冲击韧性，断裂韧性和屈服强度之间建立关系。断裂行为的分析揭示了断裂韧性与裂纹前疲劳扩展速率之间的有趣关系。

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