论文部分内容阅读
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。
The effect of controlled cooling after cooling on microstructure and hardness of 37Mn Si VS for medium carbon high vanadium non-quenched and tempered steel for bulging rod was studied by using Gleeble-3800 thermal simulator. The results show that the cooling rate has a significant effect on the microstructure and properties of the test steel. With the increase of the cooling rate, the volume fraction and hardness of the pearlite in the test steel increase gradually. When the cooling rate increases to above 1.5 ℃ / s, Tissue began to appear bainite, hardness no longer increase. Forging deformation helps to get fine structure and more ferrite, but the hardness of steel is reduced. After being deformed, the test steel is rapidly cooled down to about 600 ° C for appropriate isothermal treatment. The strength of the test steel can be remarkably improved through precipitation strengthening of a large number of fine dispersed V (C, N) particles. The results show that controlling the degree of precipitation of the microstructure and V (C, N) particles can control the hardness (strength) of the forging by controlling the cooling mode after forging.