SME CAM2 - Potential of Calphad Calculations in Development of Ni-base Alloys for AM by LPBF – Part II

Purpose and goal: The project is carried out as an SME project within the framework of Vinnova´s Competence Centre CAM2

The main goal of the project is to assess the potential of using computational tools based on the CALPHAD method to predict the cracking susceptibility of Ni-base alloys. This will be done by comparing calculations with experimental information from LPBF built alloys. For the comparisons a range of alloys will be used, from alloys that are well printable to very crack prone alloys.

Expected results and effects:

The work performed in Part I, in the period of June-Dec 2023, has given a good guide of how calculations can be used and where further efforts are needed. The following has been identified as needed for Part II: - Better prediction of the melting range - Continue and refine measurements (dilatometry, DSC, microstructures)

- Include more alloys - Include all new models that have been implemented in Thermo-Calc Approach and implementation: Work Plan WP1: Select Alloys for the Investigation WP2: Melting Interval by Calculations

In part I it was found that the prediction of melting interval is not accurate when compared to measurements. This discrepancy will be investigated and, if possible, resolved. WP3: New and Refined Measurements

New and refined measurements (dilatometry, DSC, microstructures) will be performed on the four selected alloys from Part I. WP4: Calculations The scope of the study is on cracking susceptibiliy on solidification and strain-age cracking.