GH4169合金矩形截面环轧制曲线的实验研究

Rolling Strategies in the Rolling Process of GH4169 Alloy with Rectangle Cross-section Ring

轧制曲线是环件轧制工艺设计的核心问题,尤其对钛合金和高温合金这类难变形材料环件,它是影响显微组织和尺寸精度的关键因素。采用不同类型的轧制曲线对相同尺寸GH4169合金矩形截面环进行了双向轧制实验研究,主要分析了轧制曲线类型对环件温度、环件径向增长速率、双向轧制力的影响。结果表明,"上凸型"轧制曲线有利于控制环件温升,"下凹型"轧制曲线则能较好地降低轧制力能和提高环件尺寸精度。另外,为了能更有效地控制环件截面角部的温升,保证截面组织均匀,提出了GH4169合金这类难变形材料矩形截面环轧制的特殊轧制曲线。

Rolling strategy is the key problem in the designation of ring difficult to deformation materials, such as titanium alloy and superalloy, rolling technology, especially for the and it is also the crucial factor that influences the microstructure and dimensional accuracy of the ring. In this paper, three types of rolling strategies are designed and the corresponding radial/axial ring rolling experiments are performed employing these rolling strategies on GH4169 billets with the same dimensions. The surface temperature, radial growth rate, radial and axial rolling forces are tested and recorded during the procedure. The data are compared and the effects of rolling strategies on thermomechanical parameters and rolling kinematics of GH4169 ring are analyzed. The results indicate that the ＂convex rolling strategies＂ can control the rolling temperature rise well and the ＂concave rolling strategies＂ is in favor of reducing rolling the force and ensuring the dimensional accuracy of the ring. In addition, another special kind of ring rolling strategy has been mentioned in order to avoid the temperature in the corner of ring rising too much and to get a uniform microstructure.