Session: MF-17-01 Advanced and Additive Manufacturing and Material Technologies (joint with D&A)

Paper Number: 62331

Start Time: Thursday, July 15, 2021, 09:00 AM

62331 - Qualification Challenges for Additive Manufacturing in High Temperature Nuclear Applications 

There is an increasing interest in using additive manufacturing for structural materials, including pressure retaining components. This requires that the manufacturing methods be included in Codes and Standards, such as the Boiler Pressure Vessel Code, and this work has already started moving forward with the development of a Section III Division 1 Code Case to include 316 stainless steel manufactured using powder bed fusion, an additive manufacturing technique. However, Code Cases will become significantly more challenging when time dependent properties must be considered, such as in Section III, Division 5. Section III, Division 5 requires design models based on creep as well as creep-fatigue interaction, testing for which is time intensive and costly. Additive manufacturing properties are a result of feedstock material as well as processing methods/parameters. The individual machines take what used to be a centralized material fabrication (into large plates of castings) and spread it out to many separate facilities. This decentralized fabrication, paired with the rapidly changing landscape of additive techniques and equipment manufacturers, has created difficulty in quality control and producing code cases. For low temperature code cases, this has been circumvented by requiring witness specimens that meet specified property requirements. Additional witness specimens to cover time-dependent properties would significantly increase the cost and delay processes, so similar methods may not be effective for high temperature applications. This paper covers fabrication and modeling/simulation challenges associated with qualification of additive manufacturing processes for high temperature structural materials.

Presenting Author: Michael McMurtrey Idaho National Laboratory

Authors:

Michael McMurtrey Idaho National Laboratory
Mark Messner Argonne National Laboratory