Over-Aging Effect on Fracture Toughness of Beryllium Copper Alloy C17200 |
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Authors: | Kei-Peng Jen Liqun Xu Steven Hylinski Nate Gildersleeve |
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Affiliation: | (1) Villanova University, Villanova, PA 19085, USA;(2) NGK Metals Corporation, Sweetwater, TN, USA |
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Abstract: | 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. |
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Keywords: | electron microscopy heat treating mechanical testing non-ferrous metals optical microscopy |
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