Incoloy800合金轧制变形的数值模拟及组织与性能研究

Study on numerical simulation for rolling deformation and microstructure and properties of Incoloy800 alloy

利用Deform软件建立了Incoloy800合金双辊轧机轧制的三维有限元模型,分析了Incoloy800合金在不同轧制温度下多道次轧制过程中的金属变形流动规律、应力应变场和轧制力的分布和特点,同时研究了不同温度轧制处理的Incoloy800合金大变形后的微观组织演变和力学性能。结果表明,在热轧过程中Incoloy800合金表面与轧辊接触区域的等效应力较大,并且从塑性变形区中间位置向两边呈逐渐减小趋势。随着轧制道次增加,稳定变形阶段载荷增大且变形更加均匀。与铸态和固溶态相比,大变形热轧处理后Incoloy800合金的强度明显提升,但伸长率降低明显,塑性变形能力下降。不同温度轧制后,Incoloy800合金的微观组织呈现沿轧制方向的纤维状轧制变形带组织;随着变形温度升高,晶粒长大,晶内析出相增多,当增加到800℃时发生动态再结晶。

The three-dimensional finite element model of Incoloy800 alloy rolled on double-roll rolling mill was established using Deform software. The metal deformation flow law,stress and strain field and rolling force distribution and characteristics of Incoloy800 alloy at different rolling temperatures in multi-pass rolling process were analyzed. Meanwhile,the microstructure evolution and mechanical properties of Incoloy800 alloy after large deformation by rolling at different temperatures were studied. The results show that the equivalent stress on the Incoloy800 alloy surface in the contact area with the roller is large and decreases gradually from the middle to both sides of the plastic deformation zone. The load in stable deformation stage increases with the increase of rolling passes and the deformation becomes more uniform. Compared with as-cast state and solid solution state,the strength of Incoloy800 alloy after hot rolling with large deformation is significantly improved,but the elongation is significantly reduced and the plastic deformation ability decreases. After rolling at different temperatures,the microstructure of Incoloy800 alloy presents fibrous rolling deformation band structure along the rolling direction. With the increase of deformation temperature,the grains grow,and the precipitation in grain increases,and the dynamic recrystallization occurs when the temperature increases to 800 ℃.