TY - JOUR
T1 - Finite element analysis of void growth behavior in nickel-based single crystal superalloys
AU - Yu, Q. M.
AU - Hou, N. X.
AU - Yue, Z. F.
PY - 2010/5
Y1 - 2010/5
N2 - Nonlinear stiffness method (NSM) was established to control the stress triaxiality. Based on the 3-D cell model, the void growth behavior in nickel-based single crystal superalloys (SXs) was analyzed with crystal plasticity theory and NSM. A range of factors were considered including stress triaxiality, initial volume fraction of voids, Lode parameters, crystallographic orientation, slip system activation and elastic anisotropy. The calculation results show that these factors influence the void growth character. The stress triaxiality is the driving force and plays an important role in void growth. At low stress triaxiality, the void deformation mainly exhibits as shape change, and at high stress triaxiality, it mainly exhibits as bulk expansion. The initial volume fraction of void influences the growth rate remarkably. The smaller the volume fraction is, the higher the growth rate is. The Lode parameter has great effect on the void growth and its shape change. The crystallographic orientation and activated slip systems have noticeable influence on the void growth, too. The void growth rate, when {1 1 1}〈1 1 0〉 slip system is activated, is higher than that when {1 1 1}〈1 1 2〉 slip system is activated. The elastic anisotropy plays an important role in void growth. The void grows faster in elastic isotropic matrix than that in elastic anisotropic matrix.
AB - Nonlinear stiffness method (NSM) was established to control the stress triaxiality. Based on the 3-D cell model, the void growth behavior in nickel-based single crystal superalloys (SXs) was analyzed with crystal plasticity theory and NSM. A range of factors were considered including stress triaxiality, initial volume fraction of voids, Lode parameters, crystallographic orientation, slip system activation and elastic anisotropy. The calculation results show that these factors influence the void growth character. The stress triaxiality is the driving force and plays an important role in void growth. At low stress triaxiality, the void deformation mainly exhibits as shape change, and at high stress triaxiality, it mainly exhibits as bulk expansion. The initial volume fraction of void influences the growth rate remarkably. The smaller the volume fraction is, the higher the growth rate is. The Lode parameter has great effect on the void growth and its shape change. The crystallographic orientation and activated slip systems have noticeable influence on the void growth, too. The void growth rate, when {1 1 1}〈1 1 0〉 slip system is activated, is higher than that when {1 1 1}〈1 1 2〉 slip system is activated. The elastic anisotropy plays an important role in void growth. The void grows faster in elastic isotropic matrix than that in elastic anisotropic matrix.
KW - Cell model
KW - Crystal plasticity theory
KW - Nickel-based single crystal
KW - Stress triaxiality
KW - Void
UR - http://www.scopus.com/inward/record.url?scp=77950951291&partnerID=8YFLogxK
U2 - 10.1016/j.commatsci.2010.02.028
DO - 10.1016/j.commatsci.2010.02.028
M3 - 文章
AN - SCOPUS:77950951291
SN - 0927-0256
VL - 48
SP - 597
EP - 608
JO - Computational Materials Science
JF - Computational Materials Science
IS - 3
ER -