铸态与锻态GH4738合金的热变形行为

doi:10.13251/j.issn.0254-6051.2021.12.008

摘要/Abstract

摘要： 通过MTS热模拟试验机对铸态与锻态GH4738合金在变形温度1000~1150 ℃及应变速率0.01~1 s^-1的条件下进行压缩试验,其中压下量为10%、30%、50%。结果显示,两种状态的合金应力-应变曲线均具有典型的动态再结晶特征,存在加工硬化、流变软化和稳态流变3个阶段。由应力-应变曲线得出GH4738合金铸态及锻态热变形激活能分别为Q=575.89 kJ/mol及Q=588.04 kJ/mol。并利用EBSD分析发现,在相同的热变形参数下,锻态GH4738合金组织的动态再结晶要比铸态组织发生得更早、更显著。

关键词: GH4738合金, 热模拟, 热变形行为, 本构方程

Abstract: By using MTS thermal simulator, compression tests were carried out on the as-cast and as-forged GH4738 alloy under the conditions of deformation temperature of 1000-1150 ℃ and strain rate of 0.01-1 s^-1, in which the reduction is 10%, 30% and 50%, respectively. The results show that the stress-strain curves of the alloy in two states both have typical characteristics of dynamic recrystallization, and there are three stages: work hardening, flow softening and steady-state flow. According to the stress-strain curves, the thermal deformation activation energies of as-cast and as-forged GH4738 alloy are Q=575.89 kJ/mol and Q=588.04 kJ/mol, respectively. The EBSD analysis shows that the dynamic recrystallization of as-forged GH4738 alloy occurs earlier and more significantly than that of as-cast alloy under the same thermal deformation parameters.

Key words: GH4738 alloy, thermal simulation, thermal deformation behavior, constitutive equation

中图分类号:

TG132.3

苏醒, 吕旭东. 铸态与锻态GH4738合金的热变形行为[J]. 金属热处理, 2021, 46(12): 46-52.

Su Xing, Lü Xudong. Thermal deformation behavior of as-cast and as-forged GH4738 alloy[J]. Heat Treatment of Metals, 2021, 46(12): 46-52.

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