A Computationally Based Approach to Homogenizing Advanced Alloys

Conference · Sun Feb 27 04:00:00 EST 2011

OSTI ID:1018333

Jablonski, P D; Cowen, C J

We have developed a computationally based approach to optimizing the homogenization heat treatment of complex alloys. The Scheil module within the Thermo-Calc software is used to predict the as-cast segregation present within alloys, and DICTRA (Diffusion Controlled TRAnsformations) is used to model the homogenization kinetics as a function of time, temperature and microstructural scale. We will discuss this approach as it is applied to both Ni based superalloys as well as the more complex (computationally) case of alloys that solidify with more than one matrix phase as a result of segregation. Such is the case typically observed in martensitic steels. With these alloys it is doubly important to homogenize them correctly, especially at the laboratory scale, since they are austenitic at high temperature and thus constituent elements will diffuse slowly. The computationally designed heat treatment and the subsequent verification real castings are presented.

• Research Organization: National Energy Technology Laboratory - In-house Research
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• OSTI ID: 1018333
• Report Number(s): NETL-TPR-3515
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE