Creep performance characterization for Haynes 282TM using the deformation-mechanism-based true stress model. (1st January 2023) - Ding, Y.P.
Highlights: A deformation-mechanism-based true-stress (DMTS) creep model is developed for nickel-based alloy Haynes 282, based on grain boundary sliding (GBS), intragranular dislocation glide (IDG) and intragranular dislocation climb (IDC). It describes Stage I to III creep strain evolution as function of time up to failure. It includes a two-parameter (GBS ductility and grain ductility) failure criteria, which naturally describes intergranular as well as transgranular creep rupture, and its life. A deformation mechanism map is constructed using the DMTS model for Haynes 282. The predictions from the model are in very good agreement with the experimental observations with an average coefficient of determination R 2 = 0.93. Abstract: The deformation-mechanism-based true-stress (DMTS) creep model is used to analyze short-term (<10000 h) creep test data for nickel-based alloy Haynes 282 in this research. The deformation mechanisms are delineated in terms of power-laws for grain boundary sliding (GBS), intragranular dislocation glide (IDG) and intragranular dislocation climb (IDC), with a deformation mechanism map developed, which shows the regions of IDG, IDC and GBS-dominance. It is found that the DMTS model is capable of describing the entire creep curve consisting of the primary, secondary, and tertiary stages before unstable deformation (necking) occurs. The predictions from the model are in very good agreement with the experimental observations. Coupled with a two-parameter failure criterion, the model demonstrates the effectiveness of predicting the creep failure mode and rupture life of Haynes 282 with an average coefficient of determination R 2 = 0.93.