A physically-based structure-property model for additively manufactured Ti-6Al-4V

Materials & Design

Richard A. Barrett¹  Noel M. Harrison²  Sean B. Leen³  Xinyu Yang⁴ 

[1] I-Form, the SFI Research Centre for Advanced Manufacturing, Ireland;Mechanical Engineering, School of Engineering, College of Science and Engineering, NUI Galway, Ireland;Ryan Institute for Environmental, Marine and Energy Research, NUI Galway, Ireland;Corresponding authors at: I-Form, the SFI Research Centre for Advanced Manufacturing, Ireland.;

关键词: Additive manufacturing;    Microstructure;    Tensile properties;    Phase transformation;    Dislocation density;   

DOI  :  

来源: DOAJ

【 摘 要 】

A physically-based, mixed-phase structure-property model is presented for microstructure-sensitivity of tensile stress-strain response, including yield stress, ultimate tensile strength, uniform elongation and flow stress (strain hardening), for additively manufactured Ti-6Al-4V. The interdependent effects of solutes, grain size, phase volume fraction and dislocation density are explicitly included. Solid-state phase transformation and dislocation density evolution are incorporated to simulate the effects of martensite dissolution and α-β transformation at high temperature. Predictions are validated by comparison with measured tensile test data for (i) effects of additive manufacturing process conditions (such as build orientation and sample size) on tensile properties, based on the microstructure attributes inherited from the process, and (ii) the effect of temperature on tensile stress-strain response across a broad range of temperatures. The model is thus applicable for rapid process-structure-property prediction, in conjunction with AM process modelling, to capture the effects of key manufacturing variables and for process optimization.

【 授权许可】

Unknown