为了研究表面冷速对超厚板心部冷却能力的影响,应用ANSYS有限元软件模拟分析了超厚板淬火水冷过程的截面温度场分布.结果表明:淬火过程中,心部与表面的截面温差随着表面冷速的增大而增大,但当冷速过大时,截面温差不再增大;随着表面冷速的增大,心部冷速在高温区和中温区表现出不同的变化规律,高温区(900~600℃),心部冷速随着表面冷速的增大而显著增大,但增幅逐渐减小,当表面冷速大于80℃/s后,心部冷速达到极值;中温区(600~300℃),心部冷速几乎不受表面冷速影响;此外,增大表面冷速对心部冷速的提升作用是有限的,厚度越大这一局限越为明显.
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