一种新型铌合金的高温变形行为研究

A Study of hot deformation behavior for a New type of Nb-based alloy

摘要:

为了研究一种新型铌合金的锻造性能,利用Gleeble-3500试验机对该材料在1000~1200℃下的热变形行为进行了热压缩模拟。结果表明：合金的流变应力大小对变形温度和应变速率非常敏感,流变应力随变形温度升高而降低,随应变速率提高而增大；合金的高温变形遵行幂函数方程,应力指数n约为12.03,相应的激活能Q为577.63KJ/mol,并回归出了反映锻造热力学参数对材料成形性能影响的本构方程。

Abstract:

In order to investigation the forging permormance of a New type Nb-based alloys, the deformation behavior of this alloy is researched at temperature range 1000－1200℃ and strain rate range10_-1－10s_-1 with a Gleeble-3500 machine by hot compression. The results show that the flow stress is controlled by both strain rate and deformation temperature,the flow stress decreases with the increase of temperature,while increases with the increase of strain rate．The high-temperature deformation obeys a power-law type equation. The stress exponent n is evaluated to be 12.03 and the apparent activation energy is 577.06 kJ/mol, and the constitutive equation that reflects how the thermal mechanical parameters influence the forming of material is regressed．