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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Study on exit temperature evolution during extrusion for large-scale thick-walled Inconel 625 pipe by FE simulation
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Study on exit temperature evolution during extrusion for large-scale thick-walled Inconel 625 pipe by FE simulation

机译：大型厚壁Inconel 625管材挤压过程出口温度演化的有限元模拟研究

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摘要

The extruded large-scale thick-walled pipes made from Inconel 625 alloy are widely used in many fields such as in the oil and chemical industry, thermal power generation, nuclear power plant, aerospace, and defense industry. However, the nonuniform distribution of grain size along the thickness and length directions of the extruded pipe always appears, which has a great influence on the mechanical property and uniformity of the pipe. The inhomogeneous distribution of the exit temperature in the entire extrusion process is the decisive factor leading to the grain nonuniformity of the extruded pipe. Therefore, it is necessary but difficult to reveal the evolution of the exit temperature under some key extrusion parameters in order to effectively control the exit temperature uniformity. In this paper, a thermomechanical coupled finite element (TMC-FE) model, which can precisely predict the hot deformation behavior of the extrusion process for large-scale thick-walled Inconel 625 pipe, has been firstly developed based on the DEFORM-2D platform. And then, the influence of key extrusion parameters, namely extrusion speed (V), initial billet temperature (T (b)), extrusion ratio (lambda), and friction (mu), on the exit temperature was revealed by comprehensive simulations. In addition, using the standard deviation of exit temperature (SDexit) as the measure indicator of the exit temperature uniformity, we also disclosed the influence of the key process parameters on the exit temperature uniformity in detail. The results show that with the increase of V, T (b), and mu, the uniformity of exit temperature in the entire process firstly becomes better and then gets worse. The larger lambda can result in a more uniform exit temperature. In consideration of the obtained results, within the feasible window of the key extrusion parameters defined in this paper, the conditions of T (b) = 1,100-1,150 A degrees C, V = 125-150 mm/s, mu = 0.015-0.02, and a larger extrusion ratio (lambda) are suggested for the extrusion of large-scale thick-walled Inconel 625 pipe in order to get more uniform exit temperature.
机译：由Inconel 625合金制成的大型挤出厚壁管已广泛用于许多领域，例如石油和化学工业，热力发电，核电站，航空航天和国防工业。但是，总是出现沿挤压管的厚度和长度方向的晶粒尺寸的不均匀分布，这对管的机械性能和均匀性有很大的影响。整个挤出过程中出口温度的不均匀分布是导致挤出管晶粒不均匀的决定性因素。因此，为了有效地控制出口温度的均匀性，有必要但很难揭示出口温度在某些关键挤压参数下的变化。本文首先基于DEFORM-2D平台开发了一种热机械耦合有限元（TMC-FE）模型，该模型可以精确预测大型厚壁Inconel 625管挤出过程的热变形行为。 。然后，通过综合模拟揭示了关键的挤压参数，即挤压速度（V），初始坯料温度（T（b）），挤压比（λ）和摩擦力（μ）对出口温度的影响。此外，我们以出口温度的标准偏差（SDexit）作为出口温度均匀性的衡量指标，我们还详细披露了关键工艺参数对出口温度均匀性的影响。结果表明，随着V，T（b）和mu的增加，整个过程中出口温度的均匀性先变好然后变差。较大的λ可以导致更均匀的出口温度。考虑到获得的结果，在本文定义的关键挤压参数的可行范围内，条件T（b）= 1,100-1,150 A摄氏度，V = 125-150 mm / s，mu = 0.015-0.02建议使用较大的挤压比（λ）挤压大型厚壁Inconel 625管，以使出口温度更均匀。

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