Quantification of stress-induced damage and post-fire response of 5083 aluminum alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:641

Article

Chen, Y.¹  Puplampu, S. B.³  Summers, P. T.²  Lattimer, B. Y.²  Penumadu, D.³  Case, S. W.¹ 

[1] Virginia Tech, Dept Engn Sci & Mech, Blacksburg, VA 24061 USA

[2] Virginia Tech, Dept Mech Engn, Blacksburg, VA 24061 USA

[3] Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA

关键词: Stress-induced damage;    Cavitation;    Grain elongation;    Dynamic recrystallization;    Substructure strengthening;    Residual strength;   

DOI  :  10.1016/j.msea.2015.06.060

来源: Elsevier

【 摘 要 】

One of the major concerns regarding the use of lightweight materials in ship construction is the response of those materials to fire scenarios, including the residual structural performance after a fire event. This paper presents a study on creep damage evolution in 5083 marine-grade aluminum alloy and its impact on residual mechanical behavior. Tests conducted at 400 degrees C and pre-selected tensile stress levels were interrupted at target amplitudes of accumulated engineering creep strains to investigate the stress-induced damage using ex-situ characterization. Two-dimensional optical and electron microscopy and three-dimensional X-ray tomography were utilized on samples extracted from these test specimens to characterize the external and internal creep damage. The stress-induced damage is primarily manifested as cavitation and dynamic microstructural evolution. Cavitation morphology, orientation and grain structure evolution were investigated on three perpendicular sample surfaces. A 3D examination of the damage state provided consistent damage information to that obtained from the 2D analysis. The post-fire mechanical properties were also evaluated and linked to the microstructural change. The competing processes of cavitation and grain structure evolution were investigated to develop an understanding of the stress-induced damage associated with high temperature creep. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free