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The Effect of Shot Peening on Stress Corrosion Cracking for 7075-T651 Aluminum Alloy
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Abstract This investigation presents the susceptible material of aluminum alloy 7075-T651 by shot peening at least 4 pieces of Alemen strip , using peening exposure time and Alemen strip deflection to create saturation curve. Then making use of the machine set-up parameters of the saturation curve generated to shot peening c-ring specimens. The peened c-ring specimens of individually different shot peening intensities and unpeened c-ring specimens were put into stress corrosion cracking machine for exposuring a period of time. Observing the stress corrosion cracking situation of peened and unpeened c-ring specimens by metallurgical microscope. The results present the resistance to stress corrosion cracking of peened c-ring specimens were better than those unpeened. Furthermore, the stress corrosion cracking of the peened c-ring specimens didn't occur sometimes. The occurrence of stress corrosion cracking will be happened at the conditions of stress, corrosion environment and susceptible material exist simultaneously. The purpose of shot peening is to create residual compressive stress. Since the factor of stress superposition, shot peening can improve resistance to stress corrosion cracking from the evidence of this investigation.
|Appears in Collections:||材料科學與工程學系|
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