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利用开发的特厚钢板射流淬火试验装置及多通道温度记录仪,测试了射流速度14.0~23.5 m/s、射流压力0.4~1.0 MPa条件下,84 mm、170 mm厚大断面钢板淬火温降曲线,采用有限元方法建立了三维反传热导热模型和表面换热系数模型,对比分析了射流参数和换热区分布对钢板厚向温降、温度梯度和冷速的影响。结果表明:84 mm厚钢板断面冷速与表面换热系数近似正比关系,射流速度为23.5 m/s时钢板心部冷速达3.7℃/s;170 mm厚钢板表面换热对厚向冷速影响减弱,相应的温度遗传效应和断面厚向温度梯度的影响增强。
The quenching temperature drop curves of 84 mm and 170 mm thick large section steel plates were tested under the conditions of jet velocity of 14.0 ~ 23.5 m / s and jet pressure of 0.4 ~ 1.0 MPa by using the developed special steel plate jet quenching test apparatus and multi-channel temperature recorder. The three-dimensional inverse heat transfer model and the model of surface heat transfer coefficient were established by finite element method. The influence of jet parameters and heat transfer zone distribution on the temperature drop, temperature gradient and cooling rate of steel plate was analyzed. The results show that the cross section cooling rate of 84 mm thick steel plate is approximately proportional to the surface heat transfer coefficient, and the cooling speed of the core is 3.7 ℃ / s when the jet velocity is 23.5 m / s. Weakened, and the corresponding effects of temperature genetic effects and thickening of the section to the temperature gradient are enhanced.