A Fast Spreadsheet Model for the Yield Strength of Superalloys
Triplicane A. Parthasarathy, S.I. Rao, Dennis M. Dimiduk · 2004
Simulation methods allow the possibility of overcoming some of the deficiencies of analytical models.In a recent work, we have developed a numerical model (the details of which are published elsewhere 7 ) that considers the actual microstructure of a superalloy and uses accurate descriptions of dislocation behavior to predict the critical resolved shear stress for a given microstructure.This numerical model captures the physics of the problem accurately (for cutting via single APB-coupled dislocation pairs and bowing-assisted cutting), but is computationally expensive.In this work, we present an approach that uses the numerical discrete dislocation (DD) model to build a fast spreadsheet model that may be of industrial use.A methodology to rapidly evaluate the yield strength of superalloys using a fast spreadsheet model was explored.The results from a physics-based discrete dislocation simulation model were fit to polynomials.These were used along with appropriate heuristic logic, to develop a spreadsheet that can predict the yield strength from the composition, and microstructural parameters of an alloy.The model was compared with data available for a series of superalloys and found to have good correspondence.