Master of Science in Engineering (MSE)
First Committee Member
Brendan J. O'Toole
Second Committee Member
Third Committee Member
Fourth Committee Member
Number of Pages
The objective of this research topic is to determine mechanical properties of Alloy EP-823 and to provide a mechanistic understanding of its sensitivity to both thermal treatment and performance temperature. EP-823 is a leading target material for accelerator-driven waste transmutation applications. Overall, the tensile test results of Alloy EP-823 indicated a general trend of decreasing mechanical performance with an increase in tempering time. An increase in tempering time had a statistically significant inverse relationship with ultimate tensile strength (UTS) and yield strength (YS). An increase in tempering time did not have a significant effect on elongation and reduction in area. Performance temperature effects, however, were more noticeable, trending UTS and YS values downward with increasing temperature. Elongation values experience a slight reduction up to 300°C then ramped upwards for increasing temperatures. Reduction of area values appeared unaffected by an increase in temperature up to 400°C but did experience an increase with greater temperatures beyond 400°C. With increasing temperature the mechanical properties changed gradually and predictably up to 400°C, but at 500°C they changed drastically, implying that a critical temperature can be found between 400°C and 500°C. This temperature could be important to design integrity. At performance temperatures beyond this critical temperature the material experiences unstable deformation shortly after reaching the yield strength value, exhibiting severely truncated uniform plastic deformation characteristics.
EP-823; ferritic-martensitic; heat treatment; high temperature; target material; tensile properties
Engineering Science and Materials | Materials Science and Engineering | Mechanical Engineering
Lewis, Martin Milburn, "Effect of Thermal Treatment on High Temperature Deformation of Alloy EP-~823" (2016). UNLV Theses, Dissertations, Professional Papers, and Capstones. 2699.