Prediction and measurement of residual stresses and distortions in fibre laser welded Ti-6Al-4V considering phase transformation

被引：127
作者：
Ahn, J. [1 ]
He, E. [2 ]
Chen, L. [2 ]
Wimpory, R. C. [3 ]
Dear, J. P. [1 ]
Davies, C. M. [1 ]
机构：
[1] Imperial Coll London, Dept Mech Engn, South Kensington Campus, London SW7 2AZ, England
[2] Beijing Aeronaut Mfg Technol Res Inst, Sci & Technol Power Beam Lab, Beijing, Peoples R China
[3] Helmholtz Zentrum Berlin, Hahn Meitner Pl 1, D-14109 Berlin, Germany
来源：
MATERIALS & DESIGN | 2017年 / 115卷
基金：
英国工程与自然科学研究理事会;
关键词：
Residual stress; Ti-6Al-4V; Fibre laser welding; Numerical simulation; Phase transformation; Neutron diffraction; HEAT-AFFECTED ZONE; TITANIUM-ALLOYS; ALPHA-PHASE; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; BETA-PHASE; KINETICS; STEEL; SIMULATION; BUILDS;
D O I：
10.1016/j.matdes.2016.11.078
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Residual stresses and distortions due to time dependent and localised heating imposed during fibre laserwelding a 2.0 mm thick titanium alloy Ti-6Al-4V sheet were studied. Sequentially coupled thermo-metallurgical-mechanical simulations were performed to predict welding induced residual stresses and distortion in the fibre laser weld sample, and validated using an experimental database including weld pool geometry and temperature fields. Residual stress measurements were taken using X-ray and neutron diffraction techniques and distortion measurements were recorded using a coordinate measuring machine (CMM). The influence of thermally driven non-isothermal diffusional and diffusionless solid state phase transformations on welding residual stresses and distortions were considered in the numerical model. An internal state variables approach was used to represent the transformed volume fraction of different microstructural phases as a function of cooling rate and peak temperature, and the volumetric change due to temperature variations and phase transformations were calculated. In addition, post weld heat treatment (PWHT) as a method for reducing residual stresses was examined. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：441 / 457
页数：17
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