An Arrhenius equation-based model to predict the residual stress relief of post weld heat treatment of Ti-6Al-4V plate

Yan, Guangxu; Crivoi, Alexandru; Sun, Yajuan; Maharjan, Niroj; Song, Xu; Li, Feng; Tan, Ming Jen

doi:10.1016/j.jmapro.2018.04.004

Cited by 49 publications

(26 citation statements)

References 23 publications

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“…It is well known that the longevity of epoxy resin mainly depends on moisture diffusion, which can be obtained by the TGA test. In the case of coatings, this involves exposure to UV irradiation, which can be easily examined by using accelerated the aging test using QUV Accelerated Weathering Tester [ 40 ]. The laboratory UV accelerated aging test allows researchers to study the long-term effects and changes of material properties within a very short period of time as compared to actual outdoor weathering aging.…”

Section: Methodsmentioning

confidence: 99%

Date pits based nanomaterials for thermal insulation applications—Towards energy efficient buildings in Qatar

et al. 2021

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Air-conditioning systems make the most significant part of energy consumption in the residential sector. There is no denying that it is essential to produce a comfortable indoor thermal environment for residents in a building. The actual goal is to achieve thermal comfort level without putting too much cost on the ecological system by trying to conserve the amount of energy consumed. An effective way to help achieve such a goal is by incorporating thermal insulation in buildings. Thermal insulations help reduce thermal energy gained during the implementation of a desired thermal comfort level. This study aims to use an environmentally friendly nanoparticle of date pits to create thermal insulations that can be used in buildings. Different ratios of the nanoparticle of the date pits and sand composite were investigated. Fourier transform infrared spectroscopy and scanning electron microscopy were used to characterize the new materials. The material with nanoparticles of date pits and 50% by-volume epoxy provided good thermal insulation with thermal conductivity of 0.26 W⁄mK that could be used in the existing buildings. This has the potential to reduce the overall energy consumption by 4,494 kWh and thereby reduce CO2 emissions of a 570 m2 house by 1.8 tons annually. In conclusion, the future of using nanoparticles of date pits in construction is bright and promising due to their promising results.

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Section: Methodsmentioning

confidence: 99%

Date pits based nanomaterials for thermal insulation applications—Towards energy efficient buildings in Qatar

et al. 2021

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“…Gao et al [24] investigated the effect of VSR on residual stress and fatigue life of Ti6Al4V part. Yan et al [25] used creep model considering temperature effect to predict residual stress release during post weld heat treatment (PWHT) and carried out experimental verification. The research results showed that there is a critical temperature (740 K), about which the residual stresses of Ti6Al4V start to decrease mathematically during PWHT, and the strain increment caused by creep dominated the residual stress relief.…”

Section: Introductionmentioning

confidence: 99%

Effects of Residual Stress and Equivalent Bending Stiffness on the Dimensional Stability of the Thin-Walled Parts

Gao¹,

Li²,

Wu³

et al. 2021

Preprint

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The monolithic thin-walled parts are widely used in the aeronautic and astronautic field because of its excellent mechanical performance and light weight, but the thin-walled parts are vulnerable to the machining deformation due to its low stiffness and high material removal rate. According to the relative basic theory, the stiffness and internal residual stress of the part are the critical factors affecting the dimensional stability. In this work, the influences of equivalent bending stiffness and residual stress on the dimensional stability of thin-walled parts are studied. Nine typical thin-walled parts in three groups with two materials (7075 aluminum alloy for A1~A3 and B1~B3, and Ti6Al4V titanium alloy for B4~B6) are machined and treated with different processes. Topology optimization technique is used to optimize the structure of parts to enhance the bending stiffness. Corresponding finite element method (FEM) simulations are carried out to further investigate the generation mechanism. The deformations in 312 hours after machining are measured using coordinate measuring machine, and the deformation changes of the parts are obtained and analyzed. Finally, based on topological optimization and stress relief technology, a machining deformation control method for the monolithic thin-walled parts is proposed. Results show that the maximum and average deformations of thin-walled are evidently decreased using the proposed method.

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“…Yet such assumptions do not adequately describe stress decay for aging and annealing treatments. Despite a number of stress relaxation studies concerning Ti-6Al-4V at elevated temperature, there has been little attempt to apply the findings for optimisation of aging and annealing process parameters to manage residual stress [4,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of stress relaxation on the evolution of residual stress during heat treatment of Ti-6Al-4V

Rae

Rahimi

2020

MATEC Web Conf.

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Titanium alloys, such as Ti-6Al-4V, are extensively used in critical aerospace applications. Heat treatments are often conducted during forging processes to produce final microstructures which exhibit advantageous mechanical properties. However, high thermal gradients present during processing may lead to the generation of undesirable levels of residual stress. Stress relief can be achieved by conducting aging or annealing treatments at elevated temperatures, yet there is limited quantitative understanding of how holding temperature affects the evolution of residual stress. Stress relaxation testing was conducted between 500-750°C and the resulting response was modified to describe creep strain. This was implemented in DEFORM™ finite element analysis software to model the evolution of residual stress during solution treatment followed by aging between 500-750°C, with comparison against solutions which did not consider creep strain. Stress relaxation phenomena was found to have an important impact on the reduction of residual stress and needs to be considered when carrying out thermo-mechanical processing at elevated temperatures.

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An Arrhenius equation-based model to predict the residual stress relief of post weld heat treatment of Ti-6Al-4V plate

Cited by 49 publications

References 23 publications

Date pits based nanomaterials for thermal insulation applications—Towards energy efficient buildings in Qatar

Date pits based nanomaterials for thermal insulation applications—Towards energy efficient buildings in Qatar

Effects of Residual Stress and Equivalent Bending Stiffness on the Dimensional Stability of the Thin-Walled Parts

Effect of stress relaxation on the evolution of residual stress during heat treatment of Ti-6Al-4V

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