B.Zhao
,
B.X.Xu
,
J.Liu
,
Z.F.Yue
金属学报(英文版)
Indentation creep behavior with cylindrical flat indenters on the thermal barrier coating (TBC) was studied by finite element method (FEM). On the constant applied indentation creep stress, there is a steady creep rate for each case studied for different creep properties of the TBC system. The steady creep depth rate depends on the applied indentation creep stress and size of the indenters as well as the creep properties of the bond coat of the TBC and the substrate. The possibilities to determine the creep properties of a thermal barrier system from indention creep testing were discussed. As an example, with two different size indenters, the creep properties of bond coat of the TBC system can be derived by an inverse FEM method. This study not only provides a numerical method to obtain the creep properties of the TBC system, but also extends the application of indentation creep method with cylindrical flat indenters.
关键词:
thermal barrier coating (TBC) system
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null
,
null
Z.X.Yuan
,
J.Jia
,
A.M.Guo
,
D.D.Shen
,
S.H.Song
,
J.Liu
金属学报(英文版)
The influence of tin on the hot ductility of a 0.15wt steel is investigated using a continuous-casting thermal simulator with three cooling rates. Tin can apparently deteriorate the hot ductility of the steel. Non-equilibrium grain boundary segregation of tin occurs during cooling and plays an important role in reducing the hot ductility of the steel. There is a critical cooling rate for the Sn segregation being between 5 and 20K/s.
关键词:
hot ductility
,
null
,
null
S.H.Song
,
Z.X.Yuan
,
J.Liu
,
R.G.Faulkner
金属学报(英文版)
Irradiation-induced grain boundary segregation of solute atoms frequently bring about grain boundary precipitation of a second phase because of its making the solubility limit of the solute surpassed at grain boundaries. Until now the kinetic models for irradiation-induced grain boundary precipitation have been sparse. For this reason, we have theoretically treated grain boundary precipitation under irradiation in dilute binary alloys. Predictions of γ'-Ni3 Si precipitation at grain boundaries are made for a dilute Ni-Si alloy subjected to irradiation. It is demonstrated that grain boundary silicon segregation under irradiation may lead to grain boundary γ'-Ni3Si precipitation over a certain temperature range.
关键词:
segregation
,
null
,
null
Z.X.Yuan
,
A.M.Guo
,
J.Liu
,
D.D.Shen
,
J.Jia
,
S.H.Song
金属学报(英文版)
Antimony grain boundary segregation in Fe-2Mn-Sb stucture steels has been studied through measurements of the ductile-brittle transition temperature in conjunction with scanning electron microscopy ,Auger electron spectroscopy and secondary ion mass spectroscopy.The research result reveals that during tempering or ageing after quenching at 980℃,Sb segregates to grain boundaries with both equilibrium and nonequilibrium natures and brings about temper embrittlement in the steels.Cerium can relieve temper embrittlement of the steels and its segregation to grain boundaries may play an important role in reducing this embrittlement.
关键词:
segregation
,
null
,
null
