摘要
研究了2种不同Co含量的镍基高温合金分别在650℃/630 MPa,725℃/630 MPa和760℃/630 MPa条件下的蠕变变形组织。通过透射电镜分析了温度和层错能对蠕变变形机制的影响。结果表明,对于所选取的高温合金来说,温度的提升可以有效促使蠕变变形机制由层错转变为孪晶。这表明孪晶的形成更大程度上取决于温度。此外,合金Co含量的提升以及层错能的下降都会使层错和孪晶延伸并穿过γ基体和γ’析出相,该方式提升了材料的蠕变抗力以及蠕变寿命。
The deformation microstructures of two Ni-based superalloys with different Co contents after creep tests at 650℃/630 MPa,725℃/630 MPa and 760℃/630 MPa were investigated by transmission electron microscopy(TEM),in order to study the influence of temperature and stacking fault energy(SFE)on the creep deformation mechanisms.The results show that the improvement in temperature enhances the creep mechanism transition from stacking faults to micro-twinning for the experimental single crystal alloys,suggesting that the formation of micro-twins is dependent on temperature.Moreover,increasing Co content as well as lowering SFE allow stacking faults or micro-twins to extend through theγmatrix andγ’precipitates,which improve the creep resistance and prolong the creep life of the alloys.
作者
田成刚
陶稀鹏
徐玲
崔传勇
孙晓峰
Tian Chenggang;Tao Xipeng;Xu Ling;Cui Chuanyong;Sun Xiaofeng(AECC Commercial Aircraft Engine Co.,Ltd,Shanghai 200241,China;Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第10期3532-3537,共6页
Rare Metal Materials and Engineering
基金
High Technology Research and Development Program of China(N2014AA041701)
National Natural Science Foundation of China(51171179,51271174,51331005,11332010)。
关键词
高温合金
层错
层错能
孪晶
superalloys
stacking faults
stacking fault energy
micro-twins
