期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Effects of Si Addition and Long-Term Thermal Exposure on the Tensile Properties of a Ni–Mo–Cr Superalloy 被引量:4
1
作者 Zhou-Feng Xu Jia-Sheng Dong +2 位作者 Li Jiang Zhi-Jun Li Xing-Tai Zhou 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第8期951-957,共7页
The effect of long-term thermal exposure on the grain boundary carbides and the tensile behavior of two kinds of Ni–Mo–Cr superalloys with different silicon contents(0 and 0.46 wt%) was investigated. Experimental ... The effect of long-term thermal exposure on the grain boundary carbides and the tensile behavior of two kinds of Ni–Mo–Cr superalloys with different silicon contents(0 and 0.46 wt%) was investigated. Experimental results showed granular M2C carbides formed at the grain boundaries after exposure for 100 h for the non-silicon alloy. Furthermore, these fine granular M2C carbides will transform into plate-like M6C carbides as exposure time increases. For the Si-containing alloys,only the granular M6C carbides formed at the grain boundaries during the whole exposure time. The coarsening of the grain boundary carbides occurred in both alloys with increasing exposure time. In addition, the coarsening kinetics of the grain boundary carbides for the non-silicon alloy is faster than that of the standard alloy. The tensile properties of both alloys are improved after exposure for 100 h due to the formation of nano-sized grain boundary carbides. The grain boundary carbides are coarsened more seriously for non-silicon alloys than that of Si-containing alloys, resulting in a more significant decrease in the tensile strength and elongation for the former case. Silicon additions can effectively inhibit the severe coarsening of the grain boundary carbides and thus avoid the obvious deterioration of the tensile properties after a long-term thermal exposure. 展开更多
关键词 Ni–cr–Mo Silicon carbides Mechanical properties
原文传递
Phase Stability,Elastic,Thermo-physical and Electronic Properties of Hexa-(Mo,Cr,W)_2C from First-principles Calculations
2
作者 Di WU Wan-tang FU +2 位作者 Yong LI Chun-xu WANG Jing-lin TANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第10期1096-1103,共8页
Phase stability,elastic properties,thermo-physical properties,as well as electronic properties of hexa-(Mo,Cr,W)2C carbides were investigated by first-principles calculations.The results indicated that the Mo8C4,Mo7... Phase stability,elastic properties,thermo-physical properties,as well as electronic properties of hexa-(Mo,Cr,W)2C carbides were investigated by first-principles calculations.The results indicated that the Mo8C4,Mo7Cr1C4,Mo7W1C4,Mo6W2C4,and Mo6W1Cr1C4 are stable and the stability follows the sequence:Mo6W1Cr1C4〉Mo7W1C4〉Mo7Cr1C4〉 Mo6W2C4〉 Mo8C4.Mo6W1Cr1C4 shows the highest stability,deformation resistance and hardness.G/B(shear modulus/bulk modulus)and Poisson′s ratio of the stable hexa-(Mo,Cr,W)2C are all larger than 1.75 and 0.26,respectively,which indicates that they are all brittle.The anisotropies are mainly due to the different Vogit shear modulus/Reuss shear modulus;the mechanical anisotropy of Mo7Cr1C4 is the largest,and that of Mo8C4 is the smallest.Moreover,the obtained Debye temperatureΘDand heat capacity Cpindicate that Mo6W2C4 possesses the best thermal conductivity(ΘD=497.72K),while Mo7Cr1C4 and Mo6W2C4possess the largest heat capacity when the temperature is in the range of 0-10 Kand larger than 10 K,respectively.From the electronic property analysis,the doped Cr and W atoms can not only participate in orbitals hybridization themselves but also enhance the orbitals hybridization between Mo and C atoms,which can reinforce the interatomic interactions. 展开更多
关键词 hexa (Mo cr W)2C carbide elastic property electronic structure thermo-physical property first-principles calculation
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部