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首页> 外文期刊>Journal of Materials Engineering and Performance >Prediction of Fracture Initiation in Hot Compression of Burn-Resistant Ti-35V-15Cr-0.3Si-0.1C Alloy
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Prediction of Fracture Initiation in Hot Compression of Burn-Resistant Ti-35V-15Cr-0.3Si-0.1C Alloy

机译：耐烧Ti-35V-15Cr-0.3Si-0.1C合金热压缩中的裂纹萌生预测

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摘要

An important concern in hot working of metals is whether the desired deformation can be accomplished without fracture of the material. This paper builds a fracture prediction model to predict fracture initiation in hot compression of a burn-resistant beta-stabilized titanium alloy Ti-35V-15Cr-0.3Si-0.1C using a combined approach of upsetting experiments, theoretical failure criteria and finite element (FE) simulation techniques. A series of isothermal compression experiments on cylindrical specimens were conducted in temperature range of 900-1150 degrees C, strain rate of 0.01-10 s(-1) first to obtain fracture samples and primary reduction data. Based on that, a comparison of eight commonly used theoretical failure criteria was made and Oh criterion was selected and coded into a subroutine. FE simulation of upsetting experiments on cylindrical specimens was then performed to determine the fracture threshold values of Oh criterion. By building a correlation between threshold values and the deforming parameters (temperature and strain rate, or Zener-Hollomon parameter), a new fracture prediction model based on Oh criterion was established. The new model shows an exponential decay relationship between threshold values and Zener-Hollomon parameter (Z), and the relative error of the model is less than 15%. This model was then applied successfully in the cogging of Ti-35V-15Cr-0.3Si-0.1C billet.
机译：金属热加工中的一个重要问题是，是否可以在不破坏材料的情况下实现所需的变形。本文使用up锻实验，理论破坏准则和有限元的组合方法，建立了一种断裂预测模型，以预测抗燃烧的β稳定钛合金Ti-35V-15Cr-0.3Si-0.1C在热压缩中的断裂萌生。 FE）模拟技术。首先在900-1150摄氏度的温度范围内对圆柱试样进行了一系列的等温压缩实验，应变速率为0.01-10 s（-1），首先获得了断裂样品和一次还原数据。在此基础上，比较了八个常用的理论失效准则，并选择了Oh准则并将其编码为子例程。然后对圆柱试样进行up锻实验的有限元模拟，以确定Oh准则的断裂阈值。通过建立阈值和变形参数（温度和应变率或Zener-Hollomon参数）之间的相关性，建立了基于Oh准则的新的裂缝预测模型。新模型显示了阈值与齐纳-所罗门参数（Z）之间的指数衰减关系，该模型的相对误差小于15％。该模型随后成功地应用于Ti-35V-15Cr-0.3Si-0.1C钢坯的齿槽加工中。

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