摘要
在Gleeble-3800热模拟试验机上，用热压缩试验研究了GH4700镍基合金在变形温度1120～1170℃、应变速率0．01～1S^（-1）条件下的热变形特性，建立热变形本构方程，得到其热激活能为397．337kJ／mol；在计算功率耗散效率的基础上，使用动态模型理论，绘制了GH4700合金的热加工图并观察了显微组织。结果表明：随着变形温度升高和应变速率降低，卵值明显增加。在变形温度为1170℃，应变速率为0．01S^（-1）时，能量消耗效率达到最大值0．45，动态再结晶程度较高，组织较好。
Thermal deformation characteristics of GH4700 Ni-based alloy under the condition of deformation temperature for 1120-1170 ℃ and strain rate for 0.01-1 s I were studied by hot compression test by use of the Gleeble-3800 thermal simulation test machine. The thermal deformation constitutive equation was established, and the obtained thermal activation energy is 397. 337 kJ/mol. The processing map of GH4700 Ni-based alloy was draw after calculating the power dissipation efficiency and based on the dynamic model theory, and the microstructure was also observed. The results show that 7/value increases significantly with increase of deformation temperature and decrease of strain rate. In the condition of the deformation temperature as 1170 ℃ and the strain rate as 0.01 s-1, the energy consumption efficiency reaches maximum value 0.45, and the dynamic reerystallization degree is higher and the microstructure is preferable.
出处
《金属热处理》
CAS
CSCD
北大核心
2013年第11期80-83,共4页
Heat Treatment of Metals
基金
国家“973”计划(2012CB723905)
山西省自然科学基金(2012011021-5)
关键词
镍基合金
本构方程
耗散效率
热加工图
Ni-based alloy
constitutive equation
dissipation efficiency
processing map
