【摘 要】
：
In order to study the effect of the withdrawing rate on carbide morphology, MC-type carbide in single crystal superalloy AM3 was systematically investigated wit
【机 构】
：
State Key Laboratory of Solidification Processing,Material Science and Engineering Department
论文部分内容阅读
In order to study the effect of the withdrawing rate on carbide morphology, MC-type carbide in single crystal superalloy AM3 was systematically investigated with sample growth rates from 3.5 μm/s to 500 μm/s. The carbide morphologies were investigated by scanning electron microscopy (SEM), and the electron probe microanalysis (EPMA) was used to characterize the carbide composition. The results indicate that the solidification rate is the important factor governing MC carbide growth morphology, size and distribution, composition and growth mechanism. With the increase of withdrawing rate, nodular, rod-like, Chinese script types of carbide morphology are observed. For the low withdrawing rate, with the increase of withdrawing rate, the carbide size becomes larger. For the case of dendritic interface, the carbide size becomes smaller with refinement of dendrites as withdrawing rate increases. The volume fraction of carbides increases with the withdrawing rate increasing.
其他文献
A series of hydrogen storage Co-free AB3-type alloys were directly synthesized with vacuum mid-frequency melting method, within which Ni of La0.7Mg0.3Ni3 alloy
The effects of temperature on atomic anti-site behaviors in L12-Ni3(AlFe) phases were studied using microscopic phase-field dynamic model in precipitation progr
1-butyl-3-methylimidazolium perchlorate ([BMIM]ClO4) was synthesized by two steps with N-methylimidazolium. Some physico-chemical properties, such as density, s
Deep drawing is one of the most important processes for forming sheet metal parts.It is widely used for mass production of cup shapes in automobile,aerospace an
Al-Cu alloy was deformed through equal channel angular pressing (ECAP) by routes A, Ba, Bc and C up to 5 passes. ECAP was done using a 90° die for three differ
Extraction of copper and ammonia from Cu2+-NH3-Cl--H2O solution using laboratorialy synthesized sterically hindered β-diketone (4,4-dimethyl-1-(4-dodecylphenyl
Mg-6%Al-5%Pb and Mg-6%Al-5%Pb-0.55%Zn-0.22%Mn (mass fraction) alloys were prepared by induction melting with the protection of argon. The corrosion behaviors of
CuO was synthesized by thermal decomposition of Cu(NO3)2·3H2O at various temperatures and characterized by powder X-ray diffractometry (XRD) as well as scannin
Apatite coating with nanobelt structure was fabricated on single crystal silicon by a two-step method of electrodeposition at 1.0-2.0 mA/cm2 with DC power and v
10% (volume fraction) SiCp/Al-Mg composites with different Mg contents were successfully fabricated by semi-solid mechanical stirring technique under optimum pr