Presenting a Comprehensive Model to Investigate Phase Trans-formation and Damage Growth in AISI 304 and AISI 321 At Room Temperature

Abstract

This research numerically and experimentally investigates damage growth and martensitic phase transformation at room temperature in AISI 304 and AISI 321 stainless steels. Each test comprises two stages: the first stage involves a standard tensile test, and the second stage involves X-ray diffraction to determine the phases present in the stretched sample. In the first stage, tensile tests were conducted under loading-unloading conditions for different displacements, and force-displacement curves were obtained. Damage growth was determined using the unloading slope. Subsequently, the samples were cut using a water jet and subjected to X-ray diffraction to identify the phases present in the sample and their martensitic volume fraction. Using the properties obtained from the experimental tests, a numerical model was developed by implementing the UMAT code in ABAQUS software. This simulation includes two parts: the phase transformation from austenite to martensite and damage growth. In this study, the final models were presented by combining these two models, capable of simultaneously predicting both phenomena at room temperature. Finally, the results of the experimental tests and numerical simulations were compared.

DOI: https://doi.org/10.52783/pst.635