Simulation and Experimental Investigation for the Homogeneity of Ti49.2Ni50.8 Alloy Processed by Equal Channel Angular Pressing

Zhang, Diantao; Osman, Mohamed; Li, Li; Zheng, Yufeng; Tong, Y.X.

doi:10.3390/met6030045

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Previous studies indicated that strains and temperature immensely affected the material's structure homogeneity [48,49]. However, the change of axis of deformation during MDF and higher strain per pass led to the development of uniform distribution of strain, stress and damage [50,51], observed in Fig. 6b, c.…”

Section: Discussionmentioning

confidence: 83%

A multi-response optimization of the multi-directional forging process for aluminium 7075 alloy using grey-based taguchi method

et al. 2021

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The multi-directional forging process of aluminium alloy 7075 (AA 7075) is studied using Deform 3D Version 11.0 simulation software. This process results in grain refinement in the bulk material. The 7075 aluminium alloy is used widely in the aerospace and automobile industries. Thermomechanical processing affects the mechanical properties of this alloy. This study focuses on optimising process parameters that affect the multi-directional forging using simulation. In the Taguchi design of experiment, four-factors and five levels are selected. The process input parameters considered are temperature, the strain per pass, the plunger speed, and the friction coefficient (μ). From Taguchi’s orthogonal array, forging simulations are undertaken and analysed. The significance of the process output parameters: material damage, stress and strain are analysed by analysis of variance. The results show that the friction coefficient and strain per pass highly affect the stress/strain distribution. Grey relational analysis is adopted to determine the optimum process parameters. The results show that the optimal combination of parameters is: temperature (200 °C), plunger speed (5 mm/s), friction coefficient (0.6), and strain per pass (0.6). Confirmation of simulation is carried out using the optimum input parameters. From the simulation results, the grey relational grade's optimal parameters have the highest maximum effective strain of 5.57, maximum effective stress of 665 MPa, and maximum damage of 0.416 compared to other simulated results.

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Section: Discussionmentioning

confidence: 83%

A multi-response optimization of the multi-directional forging process for aluminium 7075 alloy using grey-based taguchi method

et al. 2021

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“…Houve uma pequena redução nas incertezas das medidas de dureza experimentais, apresentando 10 HV na região externa e 8 HV na região interna, na simulação numérica as escalas principalmente na parte do centro se aproximaram e passaram a apresentar valores em escala com níveis mais próximos e mais homogêneos tanto na região externa quanto na região interna, indicando que as duas regiões estão se tornando mais homogêneas com a elevação do número de passes, resultado identificado de forma similar por Zhang et al (2016) que deformaram via ECAP uma liga de Ti-Ni e analisaram a sua homogeneidade de deformação.…”

Section: Elementos Finitosunclassified

Estudo experimental e simulação por elementos finitos da homogeneidade de deformação entre regiões de titânio comercialmente puro deformado por ECAP

Costa

Ramos²,

Batista³

et al. 2022

RSD

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O ECAP é um processo de deformação plástica severa de um material, cujo objetivo é refinar o tamanho do grão na microestrutura. Os materiais processados pelo ECAP apresentam melhorias em suas propriedades mecânicas. As variáveis de processo que afetam o refinamento da microestrutura são: rota de processamento, tipos de matriz, e número de passes. Na matriz ECAP utilizada no processo de deformação, o ângulo de canal e o ângulo de curvatura determinaram a eficiência do refinamento microestrutural. Esse trabalho tem como objetivo analisar a homogeneidade de deformação por meio do processamento mecânico do Ti CP via ECAP de forma experimental e por elementos finitos, associar os modelos para comparação entre os níveis de deformações nas regiões externa e interna com corte longitudinal do corpo de prova. As amostras de Ti CP foram deformadas via ECAP em até 8 passes, utilizando a rota A, numa matriz com ângulo de intersecção entre os canais de Φ = 120º. Aferições de microdureza Vickers foram realizadas a cada passe para avaliar as mudanças ocasionadas para posterior associação com a simulação numérica. O material foi simulado numericamente através da interface de modelagem do Abaqus – versão 2020 com licença educacional. Os parâmetros físicos foram pré-estabelecidos por meio do registro das variáveis físicas e mecânicas no software. Os resultados foram satisfatórios ao comprovarem a associação entre os estudos experimental e de elementos finitos, indicando ainda que existe diferença entre os níveis de deformação para as regiões analisadas em ambos os modelos.

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“…The present work aims to carry out a comparative study of the effect of static aging before ECAP, in combination with the dynamic aging process or redissolution of Ti 3 Ni 4 -phase particles during QC ECAP and post-deformation static aging, on the structure formation and mechanical and functional properties of a hyper-equiatomic TiNi alloy. An ECAP temperature of 450 • C and three passes were chosen as the most favorable conditions for the formation of optimum structure homogeneity in combination with the most intensive development of dynamic polygonization and aging processes [21,22].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States

Karelin,

Komarov,

Cherkasov

et al. 2023

Metals

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The effect of quasi-continuous (QC) equal-channel angular pressing (ECAP) in various pre-aged states on the structure formation and mechanical and functional properties of a hyper-equiatomic titanium nickelide (TiNi) shape memory alloy is studied. QC ECAP with a channel intersection angle of 110° is carried out at a temperature of 450 °C after aging for 1 and 5 h for three passes. To investigate the obtained structure and properties, the following research methods are applied: transmission electron microscopy, XRD analysis, calorimetric study, tension and hardness tests, and a special technique for the determination of functional properties. QC ECAP allows for the considerable refinement of structural elements and results in obtaining a mixed fine-grade structure, with structural elements of average sizes of 92 nm after pre-aging for 1 h and 115 nm after pre-aging for 5 h. Pre-aging for 5 h before QC ECAP, in combination with QC ECAP and post-deformation aging at 430 °C for 1 h, provides the best combination of mechanical and functional properties: a dislocation yield stress of 1410 MPa, ultimate tensile strength of 1562 MPa, and total recoverable strain of 11.6%. These values are comparable with the best results obtained for titanium nickelide and expand opportunities for the application of smart shape memory devices.

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Simulation and Experimental Investigation for the Homogeneity of Ti49.2Ni50.8 Alloy Processed by Equal Channel Angular Pressing

Cited by 5 publications

References 24 publications

A multi-response optimization of the multi-directional forging process for aluminium 7075 alloy using grey-based taguchi method

A multi-response optimization of the multi-directional forging process for aluminium 7075 alloy using grey-based taguchi method

Estudo experimental e simulação por elementos finitos da homogeneidade de deformação entre regiões de titânio comercialmente puro deformado por ECAP

Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States

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