淬火态与退火态45钢温变形行为的比较  

Comparison of Warm Deformation Behavior Between Quenched and Annealed 45 Steel

作　　者：赵新[1] 荆天辅[2] 

机构地区：[1]郑州航空工业管理学院六系,河南郑州450015 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦黄岛066004

出　　处：《热加工工艺》2014年第6期187-188,191,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(50271060;50371074);河北自然科学基金资助项目(503291)

摘　　要：在Gleeble热模拟试验机上采用等温压缩实验研究了45钢的温变形行为。变形温度550-700℃，变形速率0．01～0．1s-1。采用透射电镜研究了与变形现象有关的微观组织。结果显示：在550℃条件下淬火态试样的流变应力高于退火态试样的。但在600-700℃条件下，淬火态试样的流变应力在变形初期高于退火试样的，随后迅速降低，经过一段变形后退火态试样的流变应力反而更高。微观组织分析证实在温变形过程中淬火试样更易发生动态再结晶导致了上述现象。The warm deformation behavior of 45 steel as-quenched and as-annealed was studied by isothermal compression testing on a Gleeble3500 machine. The temperature range was 550℃-700 ℃ and the strain rate range 0.01 s-1- 0.1 s-1. The mierostructures with the observed deformation phenomenon was studied by TEM. The results show that the flow stress of quenched specimens is higher than that of annealed ones at 550 ℃. However, at 600 ℃ -700℃, the flow stress of quenched specimens is higher at the beginning of compression and then the opposite is true after the strain is greater than a critical value. The microstructure examination proves that the dynamic recrystallization easily occurs in quenched specimens during warm compression, which results in the above phenomenon.

关 键 词：45钢 流动应力 温变形 淬火 退火 

分 类 号：TG156.3[金属学及工艺—热处理]