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Deformation of low alloy steel pearlite → austenite phase transformation


Undeformed shape deformation of 70% 70% deformation of the undeformed 5723.85723.12743.96742.44765.68764.118.378-2Ol0726.74725.82749.1l748.1l775.7l774.434.904.8620727_35727.12753.95753.48785 .2 l784.242.892.862.2 phase transition activation energy data in Table l to peak at different heating rates lower phase change when the ln (B ・) and the curve shown in Figure 2 shows ln (B ・) and basic linear relationship. 7/lO Fig.2 peak deformation TRANSFORMATION OF ln (B ・) and the relationship between Fig. 2Therelationbetweenln (B ・, andTofDSCpeaktemperatureatdifferentdeformation kissinger equation were calculated from the slope of line II (Ec / R), is not deformed by the availability of low-alloy steel with 70% deformation of austenite in the pearlite an apparent activation energy were ll86 .83 and l070.3lkJ/mol. can be seen that deformation can reduce the low alloy steel austenite pearlite an activation energy. pearlite to austenite transformation to reduce the consumption of energy barrier. This means the deformation of pearlite to austenite transformation can become easy. pearlite to austenite in low alloy steel is to rely on the diffusion of change, and through the austenite nucleation and growth process carried out. austenite grain nucleus in the formation of pearlite phase boundaries more easily. This is because the phase boundary in the irregular arrangement of atoms, atoms in a higher energy state, and the phase space boundary, dislocation and other defects are more, C atom concentration difference are more large, both Fe and C atoms in the diffusion resistance is small, the results favor the formation of austenite nuclei to obtain the required concentration of C atoms, energy and structure. but also conducive to the spread of Fe and C atoms, so the nucleation of austenite easy. the original tissue phase interface, defects such as vacancies and dislocations more parts of the formation of austenite nuclei more. nucleation of austenite nuclei generated when the strain energy release and the diffusion of Fe and C channel more much easier pearlite to austenite. deformation can increase the space organization of low alloy steel, dislocations and other defects, the results in favor of new phase nucleation and the diffusion of Fe and C, and in the phase transition temperature reduction and phase change time reduced. accelerated pearlite to austenite transformation. 3 Conclusions (1) In this experimental conditions,[link widoczny dla zalogowanych], the low alloy steel with the heating rate increases,[link widoczny dla zalogowanych], the pearlite austenite transformation temperature with a The increase, when the heating rate of 10. C / min, the phase transformation temperature is 726.74 ℃. the end of phase transition temperature is 775.71 ℃, the apparent activation energy of phase change 1186.83kJ/mol. (2 ) deformation can reduce the low alloy steel austenite pearlite transformation of a phase transition temperature and activation energy, reduce the phase transition time. accelerate the phase transition of low alloy steel. References: 【1] Zhouguang Jiang, Gui-Quan Yin, Ya Group . phase change thermal simulation process on the V-N steel-d Transition】 【J. thermal processing, 2006,35 (6) :12-14. 【2] Chen Hongbin, LI Qing-fen, Yang Shanglin .12 Cr1MoV steel multi-pass rolling Transformation Process 【J]. mechanical design and manufacturing, 2006, (1) :131-133. 【3] Sheng Guang, Yang Zhigang. calculated Fe-c-xi alloy system in equilibrium and quasi-equilibrium model is the next d phase transformation driving force of the simple method 【J]. Metals, 2006,42 (1) :23-27. 【4] Zhang Bin, Zhang Hong ice. deformed austenite in a ferrite transformation kinetics of [J]. Shanghai Jiaotong University, 2003,[link widoczny dla zalogowanych],37 (12): l83l-l834. [5] LiuJianhua, LiWei, ChenYan.EffectsofZroncrystallizationkineticsofPr-Fe-BamorphousaUoystJ]. Trans.NonferrousMet.Soc.China,[link widoczny dla zalogowanych], 2002,12 (3) :466-469 . 【6] Qi into the wind. solid metals, diffusion and phase transition 【M]. Beijing: China Machine Press .1998.191-193. 【7】 Wang Jianan. Metallurgy and Heat Treatment [f, Beijing: Mechanical Industry Press,[link widoczny dla zalogowanych], 1988.4-5. Tin \
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