镍基单晶合金在压缩蠕变期间的组织演化与有限元分析  

Microstructure evolution and analysis of single crystal nickel-based superalloy during compression creep

作　　者：张姝[1,2] 田素贵[1] 梁福顺[1] 黎阿男[1] 李晶晶[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳化工大学机械工程学院,辽宁沈阳110142

出　　处：《材料热处理学报》2011年第6期148-154,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50571070)

摘　　要：通过[001]取向镍基单晶合金压缩蠕变性能测试及组织形貌观察,确定出合金经压应力蠕变后的组织结构是γ'相沿平行于应力轴方向形成P-型筏状组织。采用三维应力应变有限元方法计算出立方γ/γ'两相共格界面的Von Mises应力分布,研究了施加应力对应力分布及γ'相定向粗化规律的影响。结果表明,施加压应力可改变立方γ/γ'两相的应力分布,γ'相的定向粗化取向与γ基体通道的Von Mises应力分布密切相关,其中,在施加压应力作用下,立方γ'相的(001)晶面产生较大的Von Mises应力及应变能密度变化是使其发生组织演化的主要原因。并进一步提出压应力蠕变期间,合金中发生元素定向扩散和γ'相定向生长的驱动力。During compressive creep,cubical γ′ phase in orientation single crystal nickel-based superalloy is transformed into the rafted structure along the direction parallel to the applied stress axis.By means of elastic stress-strain finite element method,the Von Mises stress distributions of the cubical γ/γ′ phases were calculated for investigating the influence of the applied stress on the stress distribution and the directional coarsening regularity of γ′ phase.Results show that the stress distribution of the cubical γ/γ′ phases may be changed by applied compressive stress,and the coarsening orientation of γ′ phase is related to the Von Mises stress distribution of the γ matrix channel.Thereinto,under the action of applied compressive stress,the bigger Von Mises stress produced on（001） plane of the cubical γ′ phase is thought to be a main reason of occurring of the microstructure evolution,and the expression of the driving force for elements diffusion and the directional growing of γ′ phase during compressive creep is proposed.

关 键 词：单晶镍基合金 压应力蠕变 组织演化 有限元分析 驱动力 

分 类 号：TG132.2[一般工业技术—材料科学与工程] TG146.1[金属学及工艺—合金]