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 Posted: Wed 2:03, 19 Jan 2011 Post subject: moncler günstig Ni25 work at 900 ℃ high t |
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Ni25 at 900 �� work to improve high temperature properties of austenitic cast iron
Material, from breaking into a mesh network, bone-shaped strip into blocks and granular eutectic carbide in austenite around the place,[link widoczny dla zalogowanych], can be observed dispersed secondary carbides, granular or short needle-like distribution . Third, the discussion 1. Improve high temperature properties of nickel austenitic ductile iron ways, first by increasing the amount of containing Ni, the Ni content increased to 36, and the use of Ni solid solution strengthening effect, while adding a certain amount corresponding Cr and Si elements, the other is, by adding an appropriate amount of Mo, Cr,[link widoczny dla zalogowanych], and traces of Nb and B, control a number of carbides, such as 15 to 20, and control by heat treatment of carbide morphology, by means of second phase strengthening to improve the high temperature strength of purpose. Metallographic observations showed that the fracture of high temperature materials such as t when the temperature is above eye served strong,[link widoczny dla zalogowanych], the material strength of the grain boundary strength than the low intragranular and grain boundary crack formation and spread of a place. The second phase in the presence of grain boundaries can improve the resistance of grain boundary sliding swing, so that even with N Humphreys: low, can obtain a higher tensile properties, which can reduce costs. 2. The roundness of the graphite ball high temperature properties of tensile test at room temperature, the graphite more round ball, the ball (a) room temperature (b) 900. Chung C Figure 8 pull off at the stack of samples relative observations 100x 1992 first modern iron carbide electronic probe 2 hours sleep the new assembled lvI7sNiSiCrVMOMgFe Chennai block 316.174.090.86 - 4.4552 break with the status 23.73.789.892.091.48 - 50 to island 378.131.713.45 - 5.843 c small matrix in a similar condition,[link widoczny dla zalogowanych], high tensile strength, which L Hall-Petch equation can be interpreted in Cambodia. (Ie,[link widoczny dla zalogowanych], yield stress and grain size of the negative power of the second effort is proportional to) l, however, tension at high temperature, graphite ball the whole garden, and did not show an advantage when the test temperature in the temperature of the material on such strong Yes, goods sector is being weak, small nodular granularity interesting, just more grain boundaries, not only fail to improve high temperature strength, but reduce the high temperature strength, in the death test, the graphite samples ball very complete, with no pull to get the highest elongation, although much the same other conditions. Of course, in order to reduce shrinkage and discount rates, take into account the room temperature performance. Mexico still on the ball shape and size appropriate controls. Fourth, the application is made with N125 carburizing austenitic ductile iron plate charge, at 900 �� (transient may reach 950 ��) to load the workpiece carburizing and quenching in oil 8O ~ l20 ��, use 1400hP2 on. Its final destruction similar to the form and NrCr steel, not deformation chu crack. V. CONCLUSIONS 1. Nil25 adding the right amount of cr and ductile iron. Mo, small amount of Nb or B, can greatly improve the high temperature tensile strength, ductile iron than the N136 reported in the literature is even higher. But still maintain good thermal shock resistance and oxidation resistance. 2. When the broken mesh and particulate carbon in the 15 ~ 20%, helps to prevent grain boundary sliding and crack propagation, and thus help to improve high temperature performance of Ni austenitic ductile iron. Stabilization heat treatment can change the form of carbide. 3. Utility that, Ni austenitic ductile iron is a suitable charge to the plate as the carburizing condition that the material can be in the high temperature and thermal shock conditions. References 1 Zhang Chengfu and so on. High-Ni austenitic properties of ductile iron, Huazhong Institute of Technology, 1985 (D2ChurchN ... LAFSTrans., 1972:67 ~ 728RickardJ.eta1.TheBritishFouQdryman, 1984 (9) ~ 313 ~ 317 (on the next page the first 1O) 2. HY inoculant can be used to maintain and even improve the mechanical properties of piston rings, while reducing the amount of Taijin elements to meet the needs of production, reduce production costs, with good economic and social benefits. 3.HY inoculant treatment cylinder piston ring The base phase distribution organizations are leaving next A uniform distribution of graphite and small mesh eutectic of phosphorus and blocks, which will help improve performance piston rings. 4. inoculant with HY handling hot metal, with a simple process for a 6 , easy operation, easy production and use, can also be applied to piston rings in the monomer casting. References 1 Zhou Yukang. foreign internal combustion engines, 1977 (6): 1 ~ 72XiongCuoqingeta1.AFSTrans., 1982,90:9438 Liao fIl Army. RE Recovering condensate birth dipped iron operators, groups, Sa and of arrows. Huazhong Institute of Technology who study hard, 1986.4 Xiong Guoqing and so on. Huazhong Institute of Technology, 1985.13 (1) .65 - acridine O.
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