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Changes in Cr-Mn-Mo-B steel cooling rate on transformation kinetics of bainite

Is cooled to M. Phase transition point only to get the organization for all martensite, shown in Figure 3a the contrary, when the half-way to o5 ℃ / s slow cooling, according to CCT curve, when it has not reached when the phase transition temperature bainite phase transition has occurred, the resulting organization of granular bainite, Figure 3c. Electron microscopy analysis showed that the island granular bainite and granular strip organizations, these island structure by selected area electron diffraction analysis, the island structure is the so-called M / A organizations, other organizations not found there, see Figure 4. Figure 4a is martensite, Figure 4b for the upper bainite, granular bainite Figure 4c Figure 5 for the cooling rate and the relationship between the hardness curve. Ling can be seen as the acceleration of the hardness is increased. Shí presented in Figure 2 the middle of changing the cooling rate on the Cr-MrrMo-B steel GCT curves (c) 0.5 ℃ / s cooling rate in Figure 3 under different microstructure These results show that the continuous cooling process, the half-way change the cooling rate is different from the continuous cooling transformation occurs that changes the characteristic curve. Way to accelerate the cooling, the transition temperature decreased; the other hand, slow cooling rate is Shixiang halfway transformation temperature rise. To CCT curve, the half-way too much after the change in velocity when the cooling rate of bainite transformation start line right; the other hand, the cooling rate after the change is less than velocity, the bainite transformation start line this effect in the left production must be given consideration. Produce this phenomenon is due to the incubation period of bainite due to the consumption of different. Ji Jian-hui et al: change Cr-Mn-Mo-B steel cooling rate on bainitic transformation kinetics of (a) 8 \s Head 4 TEM under different cooling rates as 0 4 Conclusion {yi workers are carving speed / 'Cs one. Figure 5 Relationship between hardness and cooling rate of change in the continuous cooling process, the way to change the cooling rate is different from the continuous cooling transformation occurs that changes the characteristics. After the middle of changing the cooling rate greater than the initial velocity, the bainite transformation line down the right; the other hand, the middle of the cooling rate is less than after the change of velocity, the bainite transformation line left shift. References: E13DionneS, KrishnadevMR, CollinsLLInfluenceofProcessingandCoolh ~ gRateontheTransformationKineticsandbllcrostnmtureofBoronHSLASteels [A]. ProceedingsoftheInternationalSymposium0nAcceleratedCoolingofRolledsl [c]. RuddleGE, CrawleyAF, eds. WinnipegCanadaPergamonPress,[link widoczny dla zalogowanych], 1987,[link widoczny dla zalogowanych], ( Cool

71. EZ3RobertsW, LidefeltH, SandbergAHotWorkingandFormingProcesseM3. SellarsCM,[link widoczny dla zalogowanych], I ~ viesGJ, eds. London; TheMetalsSociety, 1980.38. E33 Li Xingyi, Wang Yinong, Liu Wenchang, et al. High-strength low-alloy steel, low carbon bainitic continuous cooling of hot deformed austenite transformation [j]. Steel 1997,82 (10): 4851. (Continued from p. 465) E73 Sherry Yang, QINGDAO INSTITUTE, et al. Enhanced fatigue damage equation constraints with exploration E93 Sandor, the more light Jiong translation. Cyclic stress and cyclic strain to discuss the basic principles of Feng mouth] Journal of Applied Mechanics, 1992,9 (4); 66-69. EM3. Beijing: Science Press ,1985.53-60. E53ChabocheJLContinutmaDamageMechanicsPartII-E103lvffllerKJ,[link widoczny dla zalogowanych], ZacharlachKCumulafiveDamaI) amageGrowth, CrackInitiationandCrackGrowthLawsforFatigueCrackInitiationandCrackStageI_jj. AEJAppMath ,1988,55:62-72, Vropngatio ~ J3, JStrainAnal ,[link widoczny dla zalogowanych],1977,12263-270. * 476 *

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