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T10 Steel Rapid Annealing Process of the ball

As shown in Figure 2a. Ac group Ⅱ specimens through the burning temperature of the ball quickly isothermal annealing, austenitizing soaking time to burn through the subject, identified as 10rain. Heat treatment specimen curves shown in Figure 1b, the ball annealing microstructure shown in Figure 2b. The time required for two different processes and microstructure is shown in table 1. When I'HJ / min Figure la conventional isothermal annealing process when the ball i'HJ / min Figure lb ball fast isothermal annealing process Figure 2aI group of specimens 750C × 40min, 400 × Figure 2bII group of specimens 750C × 10min, 400 × 142 China Institute of Metrology Volume 16 table 1T10 ball annealing process and compare the hardness of the ball of organizations such as minm pole King rainrq consumption in time) hard microstructure H s B S degree) process temperature and time () when ( ) (a ... ... (ball, pearl 80 210 granular bodies, carbide teeth 180 to 200 more uniform ball, pearl 60 160 granular bodies, carbide teeth 180 and 210 not even be seen from the table, and hardness of the ball close to the situation, new technology, compared with the old technology, heating austenite holding time shortened 3 / 4,ed hardy mexico, the ball of the isothermal time by 1 / 4, total time saving of about 1/4.3 analysis and test results 3.1 Discussion on the process parameters for the T10 steel in Figure 3 of the TTA continuous heating curve of austenite (a) and carbon concentration in austenite (b). Fig. 3a heating in the T10 steel is divided into four stages (heating rate selected as 10C /): (1) Ac. online point 1, PI one of the transition; (2) Ac1f line point 2, the ferrite mouth disappeared; (3) Acm line point 3, carbide cem completely dissolution; (4) ab 4 points on the dotted line, y austenite homogenization. austenite during the heating process will produce carbon concentration corresponding changes, as shown in Figure 3b. unevenly within the minimum and maximum y carbon concentration and for the C ... C ..., and y the average carbon concentration dashed line. It can be seen, a disappear (Acr online point 2) y heterogeneity in carbon concentration (C ... a C ...) the most, and this y in the initial state when the grain size, grain carbide particles within the larger number of undissolved, therefore, the ball of the annealing temperature and holding time Acr appropriate temperature through the burn and continue to increase in temperature or time, will reduce the carbon concentration gradient, reducing the number of residual carbon on the ball of the disadvantaged. can not be found in the literature Acr T10 steel temperature, the heating temperature of this study, based on the determination of the Ac. Meanwhile, in the subsequent cooling process, due to uneven Austria s body decomposition shorter incubation period, so in Ar following isothermal time can be shortened .3.2 carbon sheet on the original organization in the heating process and the broken tablets of breaking is closely related with the original organization. the original organization The more carbon in the thin sheet, the greater the interfacial area, flake carbide breaking the driving force ting store 3aT10 TTA heating curves of steel continuous ring 3b carbon concentration in austenite larger; the same time, disconnected angular parts of the smaller radius of curvature, corners rounded passivation survived fast, is conducive to greater dispersion of carbide particles, thereby enhancing the rate of the ball. literature E5] T10 steel were given by the sand cold, air-cooled and the way the cold water cooled, and then make the same ball annealing heat treatment, the results for the cooling water cooling means to obtain the original fine lamellar pearlite of the highest rates of histiocytes .4 Conclusion (1) shortening of insulation austenite time can increase the amount of residual carbide and austenite carbon concentration gradient, thus speeding up the rate of carbide spheroidization. (2) T10 steel by austenitizing temperature 750C, 10min insulation and 750C, insulation 40min annealing process compared to the ball ,ed hardy brasil, to get close to the ball of the organization, and the holding time shortened to 1 / 4. 【References [1] Nakano level, JII popular Ocean Division. High Carbon Low Alloy Steel carbide ball of the growth of c b,) L [J]. steel, iron dagger, 1972,ralph lauren outlet,58 (14): 88. [2] Liu Yunxu. Metal Heat Treatment Principles [M]. Beijing: Mechanical Industry Press, 198lJF3] Weicheng Fu, Wang ago. austenite carbon concentration in the sphere of non-uniform mechanism of annealing [J]. Four JiI Institute of Technology,ed hardy danmark, 2000,19 (2): 102 [4] He Yi, Wang ago. fastball high carbon steel annealing process of [J]. HEAT TREATMENT , 2002 (1) :32-33. [5] Wang Xiaopei, Wang Zhen Shen,polo ralph lauren, Tang Xiaojie, et al. T1o steel ball annealing the original organization of the organization [J], Metal Heat Treatment, 1996 (12) 3-4.

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