FGH95镍基合金的蠕变行为研究

• 作 者: 张媛 仇志伟 吕彦兴
• 机 构: 河北化工医药职业技术学院,河北经贸大学,
• 出 处: 铸造技术
• 发表日期: 2014年10期
• 关键词: 镍基合金 FGH95 蠕变行为 γ′相 FGH95镍基合金 位错 蠕变 位错网 抗蠕变能力 不全位错

研究了FGH95镍基合金在650℃、1 040 MPa条件下的蠕变行为。结果表明,在蠕变初期,基体中的位错开始形成并呈现出六边形特征,随着蠕变的进行,位错交织在一起。当蠕变进行到100 h后,位错出现在γ和γ′相之间交界处,增强了合金的抗蠕变能力。当蠕变进行到280 h之后,在γ和γ′相交界处的位错呈现出四边形特征,导致该处应力集中,γ′相位错遭到破坏,这时基体中的蠕变位错就会运动到γ′′相之中并形成不全位错和层错的位错组态。

The creep behavior of FGH95 nickel-base alloy at 650 ℃ and 1 040 MPa was studied. The results show that in the early stage of creep, dislocations begin to form in the matrix and exhibit hexagonal features. As creep progresses, dislocations are interwoven. When the creep reaches 100 h, dislocations appear at the junction between γ and γ ’phases, which enhances the creep resistance of the alloy. When the creep reaches 280 h, the dislocations at the junction of γ and γ ’show a quadrilateral feature, resulting in concentration of stress and destruction of γ’ phase. At this time, creep dislocations in the matrix will Movement into the γ ’phase and the formation of dislocation and stacking fault dislocation configuration.