In isothermal spheroidizing process,the spheroidization and growth of the carbide formed in hot-deformed high-carbon chromium cast steel at high temperature were investigated.The results showed that the spheroidizing ...In isothermal spheroidizing process,the spheroidization and growth of the carbide formed in hot-deformed high-carbon chromium cast steel at high temperature were investigated.The results showed that the spheroidizing growth of carbide proceeds in such a way that the bigger carbide particles swallow the smaller ones,and the short rhabdoid carbides dissolve and are spheroidized by itself.When the samples were held at 720℃ for more than 3 h,the spheroidization is not obvious.The feature of the process is the size increment and the amount decrement of carbide particles.The empirical equation for growth rate of carbides was obtained.The volume fraction of carbides keeps constant.The growth process agrees well with Ostwald Ripening Law.展开更多
The effect of rare earth elements on eutectic carbide′s morphology of low chromium semi steel in as cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this mater...The effect of rare earth elements on eutectic carbide′s morphology of low chromium semi steel in as cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this material was studied. The results show that RE can improve the eutectic carbide′s morphology, inhibit the formation and propagation of thermal fatigue cracks, therefore, promote the thermal fatigue property, which is more noticeable in case of the RE modification in combination with heat treatment. The optimal thermal fatigue property can be obtained when treated with 0.2% RE modification as well as normalization at 950 ℃ for 3 h.展开更多
Many experimental results have demonstrated that the nanocrystalline Fe-Mo-Si-B alloys prepared by crystallization of amorphous (Fe<sub>o.99</sub>,Mo<sub>o.o1</sub><sub>78</sub>Si&l...Many experimental results have demonstrated that the nanocrystalline Fe-Mo-Si-B alloys prepared by crystallization of amorphous (Fe<sub>o.99</sub>,Mo<sub>o.o1</sub><sub>78</sub>Si<sub>9</sub>B<sub>13</sub> （FMSB） alloy have many novel physical properties, except some brittleness. In order to solve this problem, the nanocrystalline alloy and a metal aluminum were bound together by isothermally annealing alternate layers consisting, of Al and amorphous FMSB alloy ribbons under high pressure in the present work to make an Al/Fe-Mo-Si-B alloy nanostructured composite. Different展开更多
基金Item Sponsored by Guiding Programme of Science and Technology Research of Hebei of China(94122123)
文摘In isothermal spheroidizing process,the spheroidization and growth of the carbide formed in hot-deformed high-carbon chromium cast steel at high temperature were investigated.The results showed that the spheroidizing growth of carbide proceeds in such a way that the bigger carbide particles swallow the smaller ones,and the short rhabdoid carbides dissolve and are spheroidized by itself.When the samples were held at 720℃ for more than 3 h,the spheroidization is not obvious.The feature of the process is the size increment and the amount decrement of carbide particles.The empirical equation for growth rate of carbides was obtained.The volume fraction of carbides keeps constant.The growth process agrees well with Ostwald Ripening Law.
文摘The effect of rare earth elements on eutectic carbide′s morphology of low chromium semi steel in as cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this material was studied. The results show that RE can improve the eutectic carbide′s morphology, inhibit the formation and propagation of thermal fatigue cracks, therefore, promote the thermal fatigue property, which is more noticeable in case of the RE modification in combination with heat treatment. The optimal thermal fatigue property can be obtained when treated with 0.2% RE modification as well as normalization at 950 ℃ for 3 h.
基金the National Natural Science Foundation of China.
文摘Many experimental results have demonstrated that the nanocrystalline Fe-Mo-Si-B alloys prepared by crystallization of amorphous (Fe<sub>o.99</sub>,Mo<sub>o.o1</sub><sub>78</sub>Si<sub>9</sub>B<sub>13</sub> （FMSB） alloy have many novel physical properties, except some brittleness. In order to solve this problem, the nanocrystalline alloy and a metal aluminum were bound together by isothermally annealing alternate layers consisting, of Al and amorphous FMSB alloy ribbons under high pressure in the present work to make an Al/Fe-Mo-Si-B alloy nanostructured composite. Different
