聚合物冷却介质对50CrMn钢板簧的淬火分析

为消除用油作淬火冷却介质造成的环境污染和火灾隐患，笔者在分析了聚合物冷却介质的冷却性能后，3种浓度的281A水溶性冷却介质对50CrMn钢板簧进行了淬火工艺试验，并对试样进行了金相分析和硬度测试，随后，与20号机油进行了淬火变形、介质管理等方面的比较，进而，分析了聚合物淬火介质淬长片板簧侧弯变形超差的原因是：此类冷却介质在钢的Ms点以下的温度范围，其冷却速度远较油快所致。最后，总结出在板簧行业推广使用聚合物冷却介质时，尚需解决降低该类介质在低温区的冷却速度和使用过程中的浓度校正及变质等问题。

The Analysis on Quenching 50CrMn Steel Leaf Spring in the Polymer Cooling Medium

To eliminate the environment pollution and fire disaster caused by using oil for quenching cooling medium,cooling property of polymer cooling medium is analyzed in this article.Then quenching technology is experimented with 281A agueous solution of three different concentrations for 50CrMn steel leaf springs.Metallographic analysis and hardness testing are done for sample.After that,this is compared with the quenching deformation and medium management used for 20 # machine oil.Then,it is found out the reason that the spring over-deviation of the bending deformation of leaf spring:the cooling speed is faster than oil's when this cooling medium is below the M S point temperature of steel. At last,this paper summarizes that the problems required to be solved are decreasing the cooling speed of this medium in low temperature,adjusting concentration and decomposition when extending the use of the polymer cooling medium in the leaf spring industry.