Session: HT-02-02 Impulsively Loaded Vessels - 2

Paper Number: 105952

105952 - Assessment of Astm A723 for Constructing Impulsively Loaded Vessels 

ASSESSMENT OF ASTM A723 FOR CONSTRUCTING IMPULSIVELY LOADED VESSELS

LA-UR-22-31720

J. Gibson, J.J. Mueller, and D. Spernjak
AbstractAn alternate material for thick, e.g. greater than ~6 inches (152 mm), non-welded Explosive containment vessels (ECVs) cover forgings was investigated. ECVs are used to partially or fully contain the detonation products of explosives. Uses of ECVs include containment of suspect luggage at airports, bomb disposal, containment of dynamic experiments, and disposal of chemical munitions. The impulsive loading and dynamic response of ECVs necessitates the use of materials with high strength and high toughness to prevent ductile exhaustion and brittle fracture. Design rules for impulsively loaded vessels (ILVs), applicable to ECVs, were introduced into Section VIII, Division 3 of the ASME BPVC Code through Code Case 2564 in 2008. In 2019, the ILV design rules were incorporated into Section VIII, Division 3, and Code Case 2564 was annulled. Section KM-4 of Section VIII, Division 3 includes approved materials for vessel fabrication; however, many of these materials either do not exhibit the requisite mechanical properties for ECV applications or lack corresponding published mechanical testing data necessary for ECV design. Another compounding factor is the new guidance in Section KM-234.1 (ASME BPVC Section VIII, Division 3, 2023), which requires Charpy V-notch (CVN) testing 60 °C (108 °F) below the Minimum Design Metal Temperature (MDMT). For many applications, this will require ECV construction materials to exhibit high toughness at low temperatures. In the present study, ASTM A723 steel forgings have been investigated as a candidate material for ECV construction. Mechanical property data from industrially produced forged disks are presented including full CVN temperature-transition curves and tensile test results. Additionally, insight is provided on the effect of tempering temperature on mechanical properties of A723 Steel.

Presenting Author: Joshua Mueller Los Alamos National Laboratory

Presenting Author Biography: Josh Mueller is an assistant professor in the Materials Science and Engineering Department at Michigan Technological University, and a Los Alamos National Laboratory affiliate with the Dynamic-Structure, Design, Engineering, and Vessel Operations Group. He holds a PhD from Colorado School of Mines in Metallurgical and Materials Engineering, and a BS in Materials Science and Engineering from the University of Wisconsin-Madison. His research interests include phase transformations and microstructural evolution associated with multi-phase microstructures, as well as microstructure-mechanical property relationships of metals. He is particularly interested in microstructural design to enhance the combined yield strength and toughness of engineering materials and incorporating thermodynamic and phase field simulations for an integrated computational materials engineering (ICME) approach to alloy and heat treatment development.

Authors:

Joshem Gibson Los Alamos National Laboratory
Joshua Mueller Los Alamos National Laboratory
Dusan Spernjak Los Alamos National Laboratory