一种新型Ni-Fe基高温合金的微观组织演化与蠕变行为  

Microstructural Evolution and Creep Behavior of a New Ni-Fe-Base Superalloy

作　　者：徐堃 操光辉[1] 严靖博[2] 张鹏[2] 刘鹏 袁勇[2] XU Kun;CAO Guanghui;YAN Jingbo;ZHANG Peng;LIU Peng;YUAN Yong(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an Shannxi 710054,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《上海金属》2024年第4期40-46,52,共8页Shanghai Metals

基　　金：华能集团重点科技项目(HNKJ20-H41);西安热工研究院有限公司研发基金(TA-20-TYK03)。

摘　　要：采用扫描电子显微镜、透射电子显微镜、电子背散射衍射技术,研究了GH4070P合金在725℃/180 MPa和725℃/150 MPa条件下的蠕变行为,分析了合金在不同条件下蠕变后的微观组织和晶体学特征,揭示了合金蠕变过程中析出相的演变规律及断裂机制。结果表明:在725℃/180 MPa和725℃/150 MPa蠕变条件下,位错通过Orowan机制绕过γ′析出相;725℃/150 MPa蠕变合金由于γ′相的粗化产生位错塞积。蠕变期间,合金晶界应力集中较为明显,产生了蠕变孔洞和微裂纹,最终导致沿晶断裂。Creep behavior of GH4070P alloy was investigated under conditions of 725℃ and 180 MPa,and 725℃ and 150 MPa,the microstructures and crystallographic characteristics of the alloy under different creep conditions were analyzed by using scanning electron microscope,transmission electron microscope and electron back scattering diffraction technique,and the evolution law of precipitation and creep fracture mechanism of the alloy during creep was revealed.The results showed that under the creep conditions of 725℃ and 180 MPa,and 725℃ and 150 MPa,dislocations mainly bypassed the γ′precipitates through the Orowan mechanism;dislocations accumulated in the alloy creeping at 725℃ and 150 MPa due to the growth of γ′precipitations.During creep process,the stress concentration was obvious at the grain boundaries of the alloy,and creep voids and microcracks were generated,ultimately leading to intergranular fracture.

关 键 词：NI-FE 基合金 γ′相 蠕变 微观组织 

分 类 号：TG156[金属学及工艺—热处理]