控制冷却对中碳高钒非调质钢组织性能的影响
发布时间:2018-02-22 13:03
本文关键词: 中碳非调质钢 控制冷却 微观组织 析出强化 出处:《钢铁》2015年08期 论文类型:期刊论文
【摘要】:利用Gleeble-3800热模拟试验机研究了锻后控制冷却对一种胀断连杆用中碳高钒非调质钢37Mn Si VS微观组织及硬度的影响。结果表明,冷却速度对试验钢的组织性能具有显著的影响,即随着冷却速度的增加,试验钢中的珠光体体积分数和硬度均逐渐增加;当冷却速度增加到1.5℃/s以上时,组织中开始出现贝氏体组织,硬度不再提高。锻造变形有助于获得细小的组织和较多的铁素体,但使钢的硬度有所降低。试验钢变形后快冷到600℃左右进行合适的等温处理,通过大量细小弥散的V(C,N)粒子的析出强化作用,可使试验钢的强度得到显著提高。结果表明,通过控制锻后冷却方式而控制组织及V(C,N)粒子的析出程度可实现对锻件硬度(强度)的差异化控制。
[Abstract]:The effect of controlled cooling after forging on the microstructure and hardness of 37MnSiVS non-quenched medium carbon high vanadium non-quenched and tempered steel for expanding and breaking connecting rod has been studied by Gleeble-3800 thermal simulation machine. The results show that the cooling rate has a significant effect on the microstructure and properties of the test steel. That is, with the increase of cooling rate, the volume fraction and hardness of pearlite in the test steel increase gradually, and when the cooling rate increases to more than 1.5 鈩,
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