Temperature Field and Stress Field Simulation of Titanium Alloy Laser Fuse Additive Manufacturing

doi:10.12068/j.issn.1005-3026.2020.04.017

Abstract

Abstract: Complex thermal cycling and residual stress distribution during the laser fuse additive forming can cause large deformation or even cracking of the deposited layer. ABAQUS software was used to establish a fully thermo-mechanical coupled finite element model. The mobile heat source subroutine was used to simulate laser loading， and the life-and-death unit technology was used to simulate the addition of materials. The thermal cycle characteristics and residual stress distribution of Ti-6Al-4V titanium alloy’s single-channel multi-layer thin-walled parts during the deposition were studied by considering the latent heat of fusion， convective/radiation heat transfer boundary conditions and material nonlinearity with temperature. The results showed that the deposition process has experienced the rapid heating and rapid cooling. With the increase of the number of layers， the thermal accumulation effect is enhanced. The sedimentary layer is in the tensile stress state and is prone to cracks and other defects.

Key words: laser fuse additive, temperature field, residual stress, Ti-6Al-4V titanium alloy, fully thermal-mechanical coupling

CLC Number:

TG457.19

REN Zhao-hui， LIU Zhen， ZHOU Shi-hua， DUAN Jing-xi. Temperature Field and Stress Field Simulation of Titanium Alloy Laser Fuse Additive Manufacturing[J]. Journal of Northeastern University Natural Science, 2020, 41(4): 551-556.

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