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首页> 外文期刊>Journal of Materials Engineering and Performance >Investigation on Cracking Behavior and Development of a Fracture Model of Ti-47Al-2Nb-2Cr Alloy During Hot Deformation
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Investigation on Cracking Behavior and Development of a Fracture Model of Ti-47Al-2Nb-2Cr Alloy During Hot Deformation

机译：热变形过程中Ti-47Al-2N-2Cr合金裂缝模型的开裂行为及开发研究

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When alloys are strained to?a certain limit under the plastic deformation, ductile fracture occurs. Whether the required deformation can be put into effect before fracture appears?has become a serious concern. A combination of?compression?tests, ductile fracture criteria as well as finite element simulation (FEM) were?employed in this study to establish the fracture initiation prediction model of Ti-47Al-2Nb-2Cr alloy. To obtain the critical fracture strain, a?technique was proposed to calculate the data for deformed cylindrical samples through isothermal compression tests in the temperature range between 1223 and 1423?K with strain rates ranging from 0.001 to 1?s_(?1). Five commonly used ductile fracture criteria were compared by FE simulation of compressing tests. It was found that the Brozzo criterion was?found to be suitable and accordingly a failure criterion, considering temperature and strain ratio was established. Hot working parameters (critical fracture value and critical strain) in deformation could be obtained through the finite element simulation, revealing that?this newly established failure criterion could accurately predict cracking initiation in compressing deformation?of Ti-47Al-2Nb-2Cr alloy ingot.
机译：当合金紧张时？在塑性变形下的一定限度时，发生延性骨折。在出现骨折之前是否可以生效所需的变形？已成为一个严重的问题。 α压缩的组合？测试，延性裂缝标准以及有限元模拟（FEM）在该研究中采用Ti-47Al-2N-2N-2Cr合金的断裂引发预测模型。为了获得临界断裂应变，提出了通过1223和1423Ω·k的温度范围内的等温压缩试验计算变形圆柱形样品的数据，其应变率范围为0.001至1Ω_（α1）。通过压缩试验的FE模拟比较了五种常用的延性骨折标准。结果发现，贿赂标准是适合的，因此考虑了温度和应变比的破坏标准。通过有限元模拟可以获得变形的热工作参数（临界断裂值和临界应变），揭示该新设立的故障标准可以准确地预测压缩变形的裂化起始α-2NB-2CR合金锭。

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