Use of Hardness and Electrical Conductivity Testing to Evaluate Heat Damage and Sensitization in 5083-H116 Al-Mg Alloys
- PDF / 2,405,764 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 51 Downloads / 172 Views
JMEPEG (2020) 29:6239–6246 https://doi.org/10.1007/s11665-020-05105-0
Use of Hardness and Electrical Conductivity Testing to Evaluate Heat Damage and Sensitization in 5083-H116 Al-Mg Alloys Yu-Chih Tzeng, Cheng-Yu Lu, Kaliyaraj Kaliyaperumal, and Ren-Yu Chen (Submitted June 25, 2020; in revised form August 5, 2020; published online September 17, 2020) Detecting heat damage and eliminating the susceptibility to sensitization of wrought 5xxx series aluminummagnesium alloys is of practical importance for the remediation of field structures. Electrical conductivity and hardness testing were employed to provide indirect evidence to assess the microstructural evolution of 5083-H116 alloys after annealing treatment at 150, 200, 250, 300, 350, 400, and 450 °C and sensitization treatment at 175 °C for 168 h. The findings indicate a strong relationship between the hardness, electrical conductivity, and degree of sensitization (DoS). This methodology can be used as a simple guide to quickly determine whether heat damage or sensitization exists. Keywords
5083-H116, electrical conductivity, hardness, heat damage, Mg2Al3, sensitization
1. Introduction Alloys of the wrought 5XXX aluminum-magnesium series, such as 5086, 5083, 5383, 5456, and 5059 alloys with H116 and H321 tempering, are attractive for use in the hulls and decks of ship structures owing to their outstanding properties, including high strength-to-weight ratio, good corrosion resistance performance, and weldability (Ref 1, 2). The 5xxx aluminum-magnesium alloys are the strongest non-heat-treatable aluminum alloys, and significant strengthening effects can be achieved through cold working and solid solution strengthening by the addition of magnesium (Ref 2-4). However, the major design issue encountered when using the wrought 5XXX aluminum-magnesium alloys for ship structures is degradation of the mechanical properties due to elevated temperatures (Ref 5), which can be causes by welding, flame straightening, and/or thermal exposure. The main reduction in mechanical properties is caused by recrystallization upon annealing at high temperatures (250-350 C), which leads to the destruction of grain structures (Ref 5, 6). The mechanical behavior at elevated temperatures of several 5xxx aluminum-magnesium alloy has been well researched (Ref 5-12), and design guides (Eurocode 9 (Ref 13)) outlining the structural behavior of aluminum
Yu-Chih Tzeng, Department of Power Vehicle and Systems Engineering, Chung-Cheng Institute of Technology, National Defense University, Taoyuan City 33551, Taiwan; Cheng-Yu Lu, Department of Naval Architecture and Ocean Engineering, Nation Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan; Kaliyaraj Kaliyaperumal, Senior Structural Naval Architect, Naval and Commercial Ship Design, Ottawa City K2L4E6, Canada; and Ren-Yu Chen, Department of Marine Mechanical Engineering, R.O.C. Naval Academy, Kaohsiung City 81345, Taiwan. Contact e-mail: [email protected].
Journal of Materials Engineering and Performance
during fire
Data Loading...
