李莎,曾莉,苗华军,郭宏钢

• 1:太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室

摘要(Abstract)：

研究了镍基高温合金GH4700变形温度和应变速率对热变形行为的影响,建立了该合金的热变形本构方程和热加工图。结果表明:在变形温度1120~1210℃、应变速率0.01~20 s-1条件下,该合金的热变形流变曲线呈现出典型的动态再结晶型特征,存在稳态的流变应力,且随着变形温度的升高和应变速率降低,动态再结晶过程更充分;GH4700合金的热变形激活能为326.3165 kJ/mol;该合金在温度为1180~1210℃,应变速率为10~20 s-1的热压缩变形条件下,能量耗散率η值较高,大于0.30,显微组织发生完全动态再结晶,获得的组织晶粒细小且分布均匀。

关键词(KeyWords)： 镍基合金;热变形;本构方程;热加工图

Abstract:

Keywords:

基金项目(Foundation): 国家“973”计划(2012CB723905);; 山西省自然科学基金(2012011021-5)

作者(Author): 李莎,曾莉,苗华军,郭宏钢

DOI: 10.13289/j.issn.1009-6264.2013.09.014

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