超高强度钢锻件锻造成形微观组织模拟  

Microstructure simulation on forging process for ultra-high strength steel forging

作　　者：何海林[1] 易幼平[1] 李蓬川[2] 陈春[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]中国第二重型机械集团公司,四川德阳618000

出　　处：《中南大学学报（自然科学版）》2013年第12期4799-4805,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2011CB706802);国家重大专项项目(2012ZX04010-081)

摘　　要：为改善起落架锻件的组织均匀性和使用性能,在Gleeble-1500热模拟机上对23Co13Ni11Cr3Mo超高强度钢进行等温压缩实验,研究变形温度、应变速率对微观组织的影响,建立高温变形微观组织演变模型,利用有限元法对起落架成形过程的组织演变进行模拟。研究结果表明:增大锻件的变形程度,可以有效地改善起落架的微观组织;提高变形温度使动态再结晶充分,但会导致晶粒尺寸增大。成形速度影响再结晶形核率和晶粒长大时间,合理的选择才能使得起落架的综合性能最好。In order to improve the aircraft landing gear forging microstructure uniformity and performance, isothermal hot compression tests of 23Co13Ni11Cr3Mo ultra-high strength steel were carried out in Gleeble-1500. Influences of deformation temperature and strain rate on microstructure were discussed. Hot deformation microstructure evolution model was established, and the microstructure evolution of aircraft landing gear forming process was simulated by finite element method. The results show that enlarging the forging deformation degree could effectively improve the microstructure of landing gear. Increasing the deformation temperature could make the dynamic recrystallization sufficient, but lead to an increase in grain size. Forming speed affects recrystallization nucleation and grain growth time, a reasonable choice could make the best comprehensive properties of aircraft landing gear.

关 键 词：超高强度钢 锻件 微观组织演变模型 数值模拟 

分 类 号：TG317[金属学及工艺—金属压力加工]