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Fatigue Performance Improvement By Dynamic Strain Aging And Dynamic Precipitation In Warm Laser Shock Peening Of Aisi 4140 Steel, Chang Ye, Gary Cheng
Fatigue Performance Improvement By Dynamic Strain Aging And Dynamic Precipitation In Warm Laser Shock Peening Of Aisi 4140 Steel, Chang Ye, Gary Cheng
Dr. Chang Ye
Warm laser shock peening (WLSP) integrates the advantages of laser shock peening and thermal-mechanical treatment (TMT) to improve material fatigue performance. Compared to traditional laser shock peening (LSP), warm laser shock peening, i.e. LSP at elevated temperature, leads to better performance in many aspects. WLSP can induce nanoscale precipitations by dynamic precipitation and high density dislocation by dynamic strain aging (DSA), resulting in higher surface strength, which is beneficial for fatigue life improvement. Due to pinning of dislocation structure by nanoscale precipitates, and the pinning of dislocation structure by Cottrell atmosphere, or the DSA effect, stability of the dislocation arrangement …
The Mechanisms Of Thermal Engineered Laser Shock Peening For Enhanced Fatigue Performance, Yiliang Liao, Sergey Suslov, Chang Ye, Gary Cheng
The Mechanisms Of Thermal Engineered Laser Shock Peening For Enhanced Fatigue Performance, Yiliang Liao, Sergey Suslov, Chang Ye, Gary Cheng
Dr. Chang Ye
Thermal engineered laser shock peening (LSP) is a technique combining warm laser shock peening (WLSP) with subsequent post-shock tempering treatment to optimize the surface strength and fatigue performance of metallic materials. This technique integrates the advantages of LSP, dynamic strain aging (DSA), dynamic precipitation (DP) and post-shock tempering to obtain optimized microstructures for extending fatigue life, such as nanoprecipitates and highly dense dislocations. In this work, AISI 4140 steel is used to evaluate the thermal engineered LSP process. The resulting microstructures as well as mechanical properties are studied under various processing conditions. The mechanism underlying the improvements in fatigue performance …