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Hot and cold deformation on the impact of low temperature steel

Action hydraulic press, so that contacts on the die and the steel plate, and then pressurized, steel to deformation. With the decline on the die, blank plate on the punch bag in the mold, through the next die. In this way, head to metal forming. At this point, the final pressure of rough steel temperature must be controlled at or above the recrystallization temperature of steel, (usually in c-above) to avoid hardening and residual stress, and maintain good ductility. As specified in the standard cold steel of low temperature heat treatment of steel have to be delivered to, l A plate heat molding the heating temperature and the final pressure and temperature can not be the same heat treatment temperature when the steel supplier. Therefore, the thermal forming. Microstructure and properties of steel and supplied to the different. Wave case, the low-temperature heating temperature of hot forming of steel is higher than when the normalizing temperature steel supplier, and its cool to. Temperature and slow and uneven pace (it and die with cooling), hot plate after forming, the state grain size than normal supply of steel Gui-thick, accompanied by thermal stress, mechanical deformation, and creep, the plastic , especially in low temperature toughness decreased. The following commonly used by low-temperature steel IBMnDR and 3.5N steel by thermal changes in properties after molding to illustrate the problem. Chongqing Iron & Steel produced 2.1 32ram thick steel plate supplier status 16MnDR normalizing 850-900 ℃. N930 ~ C steel by heating insulation & o minutes came out, after punching into a head by the 629 ~ C, 2 小时 annealing, the supplier status and heat. Plus annealed and re-forming after normalizing the performance are listed in Table 2 (the impact of the vertical sample) declined 2 chi-like plate supplier 930. C Thermoforming +620. C re-annealing are mechanical properties. MPa port n,[link widoczny dla zalogowanych], MPa05, the value of a single value of the flat Ke 3633383625445l730.530.530113, 125,911 l039 shows that annealing after deformation should have been made of steel strength, hardness decreased plasticity, Journal of the increase. The shield formed by thermal annealing of their slightly lower r in its strength, low-temperature rubidium sex has not been restored. Only by re-normalizing intensity, low temperature can be fully restored, Japan's Sumitomo Corporation 2.2 18ram thick 3.5Ni steel production, supply status of 820 ~ 860C normalizing +600 ℃ ulterior 『fire. Plate by h ~ Ng50 ℃ insulation 2O points l released into the head pressing, final pressure temperature is higher than 750c, heat the material after forming head generous low-temperature impact resistance decreased rubidium. After eight states and the supplier base or near the site after heat treatment can bundle the recovery, Table 3.128 Le Li test l9g3 on 3 axis, therefore, in order to avoid formation of low-temperature thermal properties of steel, especially low temperature toughness reduction,[link widoczny dla zalogowanych], national standards are provided to normalized, normalized and tempered or quenched and low-temperature solution treatment state supplier of steel, in the process of manufacturing equipment, such as by hot pressing, you must re-supply state heat treatment. With one exception, that is, normalizing the state can be used for delivery of low temperature steel hot forming temperature (ie start and end forming, the temperature control in a standard, specification, or manufacturer specifications are developed for the normalizing temperature of steel range), you can not re-heat treatment. ● Covent t1 lines so crazy. Pressure vessel. I989l 【5) l1223.5 Ni Qian problem sets. 3.5 nickel steel shot study report, North Italian-l99I. 103] 3oydGM. BrittleFracturejnSteeIStructure. InA, 229lGB | 1B0 \To establish crystal Pa (boo) crystal plane family, for example, the equivalent crystal plane family there (oho), (ooh), but should not be included (hoo),[link widoczny dla zalogowanych], (oho), (oo). Therefore,[link widoczny dla zalogowanych], (boo) crystal plane the multiplicity of ethnic factor should be 3 instead of 6, and in almost all children on x-ray diffraction of discourse,[link widoczny dla zalogowanych], given the multiplicity of factors which the data are \, 2]. As the intensity of x-ray diffraction with a lot of cable in Cambodia, in particular in direct proportion with the incident beam intensity, but not J's inspection of any condition, good strong beam to the hand of people is different, so the orange points in the material Xin in, PDF card also gives the relative intensity of the diffraction lines. It can be seen, the calculation of the diffraction intensity, the intensity of each beam diffraction lines are multiplied by 2, and u will not affect the results of phase analysis. precisely because so, the problem was caused by long outstanding attention to people's attention and we believe that is mentioned above, the crystal plane family, crystal face index and multiplicity factor definition, and can not think (,) is (,) is equivalent to hope the other crystal plane family. From a scientific rigor perspective, the multiplicity factor of incorrect data, or that and more

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